| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:CommonStockValue | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | NA | NA | NA | 1.0 | NA | NA | NA | 1.0 | NA | NA | NA | |
| us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock | ██████▇▇▇█████▇▇▇▂▂▂▂▃▃▃▃▂▁▁▁▂▁▁▁▁▆▆▆▆▆▆▆▆▅▅▅▅ | 99.5 | 99.6 | 99.4 | 99.4 | 99.4 | 99.4 | 98.6 | 98.6 | 98.6 | 99.1 | 98.9 | 98.9 | 98.9 | 98.8 | 98.3 | 98.3 | 98.7 | 89.5 | 88.9 | 89.8 | 89.8 | 90.0 | 90.1 | 91.4 | 91.5 | 88.2 | 87.8 | 87.8 | 87.7 | 88.1 | 88.0 | 87.4 | 87.3 | 87.2 | 95.7 | 95.7 | 95.7 | 95.6 | 95.2 | 95.3 | 95.3 | 95.2 | 93.4 | 93.4 | 93.5 | 93.6 |
| us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding | ▄▄ | 100.2 | 100.2 | NA | 99.9 | 99.9 | 99.6 | NA | 99.4 | 99.3 | 99.7 | NA | 100.0 | 99.6 | 99.4 | NA | 99.0 | 98.9 | 99.0 | NA | 99.4 | 99.4 | 99.4 | NA | 101.5 | 101.5 | 101.1 | NA | 100.5 | 100.6 | 100.9 | NA | 100.4 | 99.8 | 107.1 | NA | 108.1 | 108.0 | 108.7 | NA | 109.2 | 109.5 | 109.0 | NA | 108.3 | 108.2 | 108.0 |
| us-gaap:WeightedAverageNumberOfSharesOutstandingBasic | ▄▄ | 99.0 | 99.0 | NA | 98.7 | 98.7 | 98.2 | NA | 97.8 | 98.0 | 98.4 | NA | 98.0 | 97.9 | 97.8 | NA | 97.8 | 90.3 | 88.8 | NA | 89.1 | 89.3 | 89.5 | NA | 90.6 | 89.8 | 87.1 | NA | 86.5 | 86.7 | 87.3 | NA | 86.2 | 86.1 | 94.0 | NA | 94.7 | 94.6 | 94.5 | NA | 93.3 | 93.3 | 93.1 | NA | 92.8 | 92.8 | 92.7 |
| us-gaap:EarningsPerShareBasic | ▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▃▂▂▂▂▂▂▂▁▂█▁▂▂ | 1.14 | 1.08 | 0.87 | 0.78 | 0.34 | 0.88 | 0.69 | 0.99 | 0.93 | 1.04 | 0.29 | 0.9 | 0.93 | 0.85 | 0.62 | 0.67 | 0.7 | 0.75 | 0.73 | 0.69 | 0.7 | 0.65 | 0.52 | 0.56 | 0.47 | 0.47 | 0.46 | 0.55 | 0.93 | 0.51 | -0.31 | 0.6 | 1.85 | 0.49 | 0.44 | 0.44 | 0.43 | 0.39 | 0.47 | 0.54 | 0.17 | 0.79 | 8.33 | 0.27 | 0.44 | 0.37 |
| us-gaap:EarningsPerShareDiluted | ▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▃▂▂▂▂▂▂▂▁▂█▂▂▂ | 1.13 | 1.07 | 0.86 | 0.78 | 0.34 | 0.87 | 0.68 | 0.98 | 0.92 | 1.03 | 0.28 | 0.89 | 0.92 | 0.84 | 0.61 | 0.67 | 0.7 | 0.7 | 0.68 | 0.64 | 0.65 | 0.61 | 0.49 | 0.52 | 0.45 | 0.44 | 0.44 | 0.52 | 0.85 | 0.48 | -0.31 | 0.58 | 1.66 | 0.48 | 0.44 | 0.44 | 0.43 | 0.39 | 0.46 | 0.54 | 0.17 | 0.73 | 7.16 | 0.27 | 0.44 | 0.37 |
| us-gaap:IncomeLossFromContinuingOperationsPerBasicShare | ▂▂▂▂▂▂▂▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▃▂▂▂▂▂▂▁▁▂█▁▂▂ | 1.1399999999999999e-06 | 1.08e-06 | 8.7e-07 | 7.8e-07 | 3.4000000000000003e-07 | 8.8e-07 | 6.9e-07 | 9.9e-07 | 9.300000000000001e-07 | 1.0500000000000001e-06 | 2.7e-07 | 9.000000000000001e-07 | 9.300000000000001e-07 | 8.6e-07 | 6.2e-07 | 6.7e-07 | 7e-07 | 7.5e-07 | 7.3e-07 | 6.9e-07 | 7e-07 | 6.5e-07 | 5.1e-07 | 5.6e-07 | 4.9e-07 | 4.6999999999999995e-07 | 4.3e-07 | 5.6e-07 | 8.900000000000001e-07 | 5.1e-07 | -3.1e-07 | 6.1e-07 | 1.85e-06 | 4.9e-07 | 4.2e-07 | 4.4e-07 | 3.9e-07 | 4.0000000000000003e-07 | 5.2e-07 | 1.7000000000000001e-07 | 1.4e-07 | 6.3e-07 | 8.31e-06 | 2.4e-07 | 4.0000000000000003e-07 | 4.0000000000000003e-07 |
| us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare | ▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▁▂▃▂▂▂▂▂▂▁▁▂█▂▂▂ | 1.13e-06 | 1.0700000000000001e-06 | 8.6e-07 | 7.8e-07 | 3.4000000000000003e-07 | 8.7e-07 | 6.800000000000001e-07 | 9.8e-07 | 9.200000000000001e-07 | 1.04e-06 | 2.6e-07 | 8.900000000000001e-07 | 9.200000000000001e-07 | 8.5e-07 | 6.1e-07 | 6.7e-07 | 7e-07 | 7e-07 | 6.800000000000001e-07 | 6.4e-07 | 6.5e-07 | 6.1e-07 | 4.8e-07 | 5.2e-07 | 4.6999999999999995e-07 | 4.4e-07 | 4.1e-07 | 5.3e-07 | 8.100000000000001e-07 | 4.8e-07 | -3.1e-07 | 5.9e-07 | 1.66e-06 | 4.8e-07 | 4.2e-07 | 4.4e-07 | 3.9e-07 | 4.0000000000000003e-07 | 5e-07 | 1.7000000000000001e-07 | 1.4e-07 | 6e-07 | 7.15e-06 | 2.4e-07 | 4.0000000000000003e-07 | 4.0000000000000003e-07 |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cost Ratio us-gaap:StatementBusinessSegments ehc:HomeHealthandHospiceSegment | █▇▇▇▅▇██▆▆▆▅▄▃▃▂▂▁ | 286.1 | 270.5 | 281.3 | 274.5 | 249.6 | 272.8 | 287.7 | 289.3 | 261.1 | 253.9 | 250.3 | 242.0 | 233.1 | 205.7 | 206.4 | 198.1 | 188.8 | 179.3 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| Cost Ratio us-gaap:StatementBusinessSegments ehc:InpatientRehabilitationSegment | █▇▆▅▂▅▅▄▄▄▃▂▃▃▂▁▁▁ | 1001.6 | 959.9 | 933.1 | 899.4 | 824.5 | 909.2 | 896.7 | 872.3 | 873.9 | 870.1 | 845.7 | 825.6 | 834.6 | 840.3 | 802.4 | 783.5 | 777.6 | 777.8 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TTM Greenblatt ROC _ _ | NA | NA | 168.3 | 151.1 | 85.2 | 159.3 | 141.2 | 151.2 | 152.6 | 167.1 | 93.4 | 154.5 | 157.3 | 150.0 | 144.7 | 145.2 | 141.3 | 147.1 | 145.5 | 148.2 | 150.2 | 144.2 | 135.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:ComprehensiveIncomeNetOfTax | ▂▂▂▂▁▂▁▂▂▂▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▂█▁▁▁ | 113.3 | 107.3 | 86.0 | 77.7 | 33.5 | 87.0 | 67.6 | 97.6 | 91.2 | 102.3 | 28.1 | 88.6 | 91.8 | 83.8 | 60.2 | 65.9 | 63.0 | 67.1 | 65.1 | 61.6 | 62.8 | 58.1 | 46.9 | 49.9 | 43.0 | 42.6 | 41.7 | 50.0 | 83.2 | 46.8 | 49.0 | 58.3 | 163.4 | 51.4 | 46.5 | 48.2 | 46.9 | 45.0 | 49.6 | 56.3 | 22.1 | 80.0 | 778.4 | 37.1 | 46.1 | 37.9 |
| us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | █▇▇▆▃▅▆▅▅▆▅▅▅▅▇▄▃▄▄▃▄▄▄▄▄▃▃▃▃▃▃▃▂▃▂▂▂▂▂▂▁▂▁▁▁▁ | 28.7 | 25.5 | 25.7 | 22.4 | 14.8 | 21.7 | 22.6 | 21.9 | 19.7 | 22.9 | 19.6 | 20.7 | 21.4 | 21.4 | 25.9 | 19.2 | 16.4 | 17.6 | 16.8 | 16.4 | 18.6 | 18.7 | 18.8 | 17.1 | 17.3 | 16.5 | 15.4 | 14.7 | 14.8 | 14.8 | 15.3 | 14.1 | 13.8 | 14.6 | 12.3 | 12.8 | 13.2 | 12.6 | 12.5 | 11.3 | 10.4 | 11.7 | 10.7 | 10.1 | 10.2 | 9.8 |
| us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | NA | 132.8 | 111.69999999999997 | 100.1 | 48.3 | 108.7 | 90.2 | 119.5 | 110.9 | 125.2 | 47.7 | 109.3 | 113.2 | 105.2 | 86.1 | 85.1 | 79.4 | 84.7 | 81.9 | 78.0 | 81.4 | 76.8 | 65.7 | 67.0 | 60.3 | 59.1 | 57.1 | 64.7 | 98.0 | 61.6 | 64.3 | 72.4 | 177.2 | 66.0 | 58.8 | 61.0 | 60.1 | 57.6 | 62.1 | 67.6 | 32.5 | 91.7 | 789.1 | 47.2 | 56.3 | 47.7 | |
| us-gaap:CostsAndExpenses | ███▇▇▇█▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▄▄▃▃▂▂▂▂▂▁▂▂▂▁▁▁▁▁▁▂▂▁▁▁ | 1068.7 | 1022.7 | 1021.4 | 1001.4 | 974.8 | 1001.8 | 1021.8 | 989.7 | 964.5 | 936.5 | 985.3 | 894.5 | 891.0 | 876.9 | 841.2 | 820.7 | 811.9 | 795.8 | 775.6 | 749.9 | 738.9 | 732.8 | 713.4 | 632.0 | 615.1 | 608.5 | 496.8 | 475.2 | 467.5 | 467.4 | 449.3 | 424.9 | 445.9 | 444.8 | 440.9 | 426.1 | 424.1 | 426.9 | 416.7 | 410.3 | 406.1 | 434.6 | 509.2 | 385.7 | 388.5 | 403.1 |
| us-gaap:GainsLossesOnExtinguishmentOfDebt | ▄ | -1.0 | NA | NA | NA | 0.0 | NA | -5.4 | 0.0 | -2.3 | NA | 0.0 | 0.0 | 0.0 | NA | 0.0 | -0.3 | -10.4 | 0.0 | 0.0 | -2.6 | -2.0 | -2.4 | -2.4 | 0.0 | -18.8 | -1.2 | -13.2 | 0.0 | 0.0 | 0.0 | -2.4 | 0.0 | NA | NA | -2.7 | -1.3 | 0.0 | NA | 0.0 | -12.7 | -26.1 | NA | 11.9 | 0.0 | -0.1 | NA |
| us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems | ▄ | -1.0 | NA | NA | NA | 0.0 | NA | -5.4 | 0.0 | -2.3 | NA | 0.0 | 0.0 | 0.0 | NA | 0.0 | -0.3 | -10.4 | 0.0 | 0.0 | -2.6 | -2.4 | -2.4 | -2.4 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes05.125Due2023,us-gaap:SeniorNotes | ▄ | -1.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:StatementScenario,us-gaap:DebtInstrument,us-gaap:LongtermDebtType srt:ScenarioForecast,ehc:SeniorNotes05.125Due2023,us-gaap:SeniorNotes | ▄ | -0.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:StatementScenario,us-gaap:DebtInstrument,us-gaap:LongtermDebtType,us-gaap:SubsequentEventType srt:ScenarioForecast,ehc:SeniorNotes0575Due2024,us-gaap:SeniorNotes,us-gaap:SubsequentEvent | NA | NA | -2.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:GeneralAndAdministrativeExpense | ▅▃▃▃▃▂▆▅█▅▅▄▅▆▃▃▅▃▃▂▂▂▂▂▂▂▃▁▂▂▂▂▂▂▂▂▁▂▂▁▁▁▁▁▁▁ | 54.2 | 38.6 | 37.8 | 39.1 | 43.0 | 35.6 | 64.0 | 52.5 | 77.1 | 53.4 | 54.3 | 49.9 | 54.9 | 61.1 | 43.1 | 39.7 | 52.4 | 36.5 | 36.8 | 30.3 | 34.4 | 31.9 | 36.0 | 30.6 | 32.1 | 34.6 | 36.4 | 27.5 | 30.2 | 30.7 | 30.6 | 28.8 | 29.5 | 30.2 | 30.6 | 29.3 | 28.0 | 30.0 | 29.8 | 26.4 | 27.4 | 26.9 | 28.3 | 24.9 | 26.7 | 26.3 |
| us-gaap:IncomeLossFromContinuingOperations | ▂▂▂▂▁▂▁▂▂▂▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▁█▁▁▁ | 113.6 | 107.3 | 86.0 | 77.7 | 33.4 | 87.1 | 67.6 | 97.6 | 91.3 | 102.8 | 26.6 | 88.7 | 91.6 | 84.3 | 60.8 | 66.0 | 62.8 | 67.1 | 65.0 | 61.8 | 62.7 | 58.1 | 46.3 | 50.4 | 44.5 | 42.8 | 39.4 | 51.0 | 79.3 | 46.8 | 48.8 | 59.1 | 165.1 | 51.7 | 45.1 | 47.6 | 43.2 | 44.6 | 55.0 | 22.2 | 19.4 | 65.4 | 787.9 | 28.4 | 43.9 | 43.8 |
| us-gaap:IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | █▁ | 28.7 | 25.5 | NA | 22.4 | 14.8 | 21.7 | NA | 21.9 | 19.7 | 22.9 | 19.6 | 20.7 | 21.4 | 21.4 | 25.9 | 19.2 | 16.4 | 17.6 | 16.8 | 16.4 | 18.6 | 18.7 | 18.8 | 17.1 | 17.3 | 16.5 | 15.4 | 14.7 | 14.8 | 14.8 | 15.3 | 14.1 | 13.8 | 14.6 | 12.3 | 12.8 | 13.2 | 12.6 | 12.5 | 11.4 | 11.3 | 11.8 | 10.6 | 10.3 | 10.3 | NA |
| us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | █▇▆▅▁▆▅▆▅▇▂▆▆▆▆▅▄▅▅▅▅▄▄▄▃▃▂▃▅▃▃▄▃▄▃▃▃▃▃▁ | 181.8 | 167.3 | 149.7 | 127.0 | 60.0 | 135.9 | 117.5 | 153.8 | 134.5 | 156.5 | 75.6 | 139.6 | 142.3 | 135.7 | 135.9 | 128.3 | 107.8 | 124.4 | 121.5 | 120.3 | 123.7 | 116.5 | 108.6 | 103.4 | 94.0 | 89.6 | 74.1 | 87.8 | 130.6 | 94.4 | 94.6 | 108.4 | 92.4 | 99.8 | 81.9 | 88.5 | 83.3 | 86.3 | 82.7 | 51.7 | NA | NA | NA | NA | NA | NA |
| us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | ▂▂▂▂▁▂▂▂▂▂▁▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▁█▁▁▁ | 142.3 | 132.8 | 111.7 | 100.1 | 48.2 | 108.8 | 90.2 | 119.5 | 111.0 | 125.7 | 46.2 | 109.4 | 113.0 | 105.7 | 86.7 | 85.2 | 79.2 | 84.7 | 81.8 | 78.2 | 81.3 | 76.8 | 65.1 | 67.5 | 61.8 | 59.3 | 54.8 | 65.7 | 94.1 | 61.6 | 64.1 | 73.2 | 178.9 | 66.3 | 57.4 | 60.4 | 56.4 | 57.2 | 67.5 | 33.6 | 30.7 | 77.1 | 788.6 | 38.7 | 54.2 | 53.6 |
| us-gaap:IncomeTaxExpenseBenefit | ████████████████████████████████▇█████████▁███ | 39.5 | 34.5 | 38.0 | 26.9 | 11.8 | 27.1 | 27.3 | 34.3 | 23.5 | 30.8 | 29.4 | 30.2 | 29.3 | 30.0 | 49.2 | 43.1 | 28.6 | 39.7 | 39.7 | 42.1 | 42.4 | 39.7 | 43.5 | 35.9 | 32.2 | 30.3 | 19.3 | 22.1 | 36.5 | 32.8 | 30.5 | 35.2 | -86.5 | 33.5 | 24.5 | 28.1 | 26.9 | 29.1 | 15.2 | 18.1 | 11.2 | -5.6 | -741.5 | -0.4 | -1.3 | 2.5 |
| us-gaap:InterestExpense | ▄▅▇█▆▅▆▃▂▂▂▂▂▁▁▂▄▄▄▅▅▆▆▁ | 41.8 | 42.8 | 46.2 | 49.0 | 45.8 | 43.2 | 44.5 | 40.3 | 37.7 | 37.2 | 36.7 | 37.3 | 37.7 | 35.6 | 35.9 | 36.8 | 40.4 | 41.3 | 41.6 | 42.5 | 43.4 | 44.6 | 44.6 | 35.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:InterestExpenseDebt us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems | ▃▃▃▃▃▃▃▃▃▃▃▃▃▃█▁▁▁▃▃▁▁▃▃ | 41.8 | 42.8 | 46.2 | 49.0 | 45.8 | 43.2 | 44.5 | 40.3 | 37.7 | 37.2 | 36.7 | 37.3 | 37.7 | 35.6 | 272.9 | -36.8 | -40.4 | -41.3 | 41.6 | 42.5 | -43.4 | -44.6 | 44.6 | 35.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LitigationSettlementExpense | NA | NA | 0.0 | 0.0 | 0.0 | 2.8 | NA | NA | 0.0 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | 0.0 | 0.0 | NA | NA | -0.5 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LitigationSettlementExpense us-gaap:ConsolidationItems us-gaap:MaterialReconcilingItems | NA | NA | 0.0 | 0.0 | 0.0 | 2.8 | NA | NA | 0.0 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | 0.0 | 0.0 | NA | NA | -0.5 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:NetIncomeLoss | ▂▂▂▂▁▂▁▂▂▂▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▂█▁▁▁ | 113.3 | 107.3 | 86.0 | 77.7 | 33.5 | 87.0 | 67.6 | 97.6 | 91.2 | 102.3 | 28.1 | 88.6 | 91.8 | 83.8 | 60.6 | 65.9 | 63.0 | 66.8 | 65.3 | 61.7 | 62.6 | 58.0 | 47.0 | 50.7 | 42.9 | 42.5 | 42.1 | 50.1 | 83.1 | 46.7 | 48.9 | 58.2 | 165.2 | 51.3 | 47.0 | 47.1 | 46.7 | 44.2 | 50.0 | 57.0 | 21.9 | 79.8 | 779.2 | 31.8 | 47.3 | 40.7 |
| us-gaap:NetIncomeLossAttributableToNoncontrollingInterest | █▇▇▆▃▅▆▅▅▆▅▅▅▅▇▄▃▄▄▃▄▄▄▄▄▃▃▃▃▃▃▃▂▃▂▂▂▂▂▂▁▂▁▁▁▁ | 28.7 | 25.5 | 25.7 | 22.4 | 14.8 | 21.7 | 22.6 | 21.9 | 19.7 | 22.9 | 19.6 | 20.7 | 21.4 | 21.4 | 25.9 | 19.2 | 16.4 | 17.6 | 16.8 | 16.4 | 18.6 | 18.7 | 18.8 | 17.1 | 17.3 | 16.5 | 15.4 | 14.7 | 14.8 | 14.8 | 15.3 | 14.1 | 13.8 | 14.6 | 12.3 | 12.8 | 13.2 | 12.6 | 12.5 | 11.3 | 10.4 | 11.7 | 10.7 | 10.1 | 10.2 | 9.8 |
| us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted | ▅▅▄▄▁▄▃▅▄▅▁▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▄▂▂▃█▂▂▂▂▂ | 113.3 | 107.3 | 86.0 | 77.7 | 33.5 | 87.0 | 67.6 | 97.6 | 91.2 | 102.3 | 28.1 | 88.6 | 91.8 | 83.8 | 60.6 | 65.9 | 71.3 | 69.3 | 67.8 | 64.1 | 65.0 | 60.4 | 49.4 | 53.1 | 45.2 | 44.8 | 44.3 | 52.4 | 85.4 | 48.9 | 49.9 | 58.2 | 165.2 | 51.3 | 47.0 | 47.1 | 46.7 | 44.2 | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:OperatingIncomeLoss | NA | NA | 168.3 | 151.1 | 85.2 | 159.3 | 141.2 | 151.2 | 152.6 | 167.1 | 93.4 | 154.5 | 157.3 | 150.0 | 144.7 | 145.2 | 141.3 | 147.1 | 145.5 | 148.2 | 150.2 | 144.2 | 135.5 | 121.2 | 123.4 | 105.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:OtherNonoperatingIncomeExpense | ▃▂▂▂▃▁▂▆▂▂▁▂▂▁▂▂▂▂▂▂▂▂▂▂▂▂▂▁█▂▂▂▂▂▂▃▂▂▂▁▂▂▂▂▂▂ | 4.6 | 1.4 | 4.2 | 2.5 | 5.8 | -1.9 | 3.6 | 21.0 | 2.2 | 3.7 | -0.7 | 1.7 | 1.3 | -0.1 | 1.2 | 1.0 | 0.9 | 1.0 | 0.8 | 0.8 | 0.7 | 0.6 | 1.3 | 0.7 | 3.0 | 0.5 | 1.1 | 0.2 | 28.2 | 1.7 | 1.3 | 0.6 | 1.9 | 0.7 | 1.1 | 6.1 | 0.4 | 0.9 | 1.2 | 0.2 | 0.7 | 0.6 | 1.8 | 0.7 | 1.4 | 0.7 |
| us-gaap:ProfitLoss | ▂▂▂▂▁▂▂▂▂▂▁▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▂█▁▁▁ | 142.0 | 132.8 | 111.7 | 100.1 | 48.3 | 108.7 | 90.2 | 119.5 | 110.9 | 125.2 | 47.7 | 109.3 | 113.2 | 105.2 | 86.5 | 85.1 | 79.4 | 84.4 | 82.1 | 78.1 | 81.2 | 76.7 | 65.8 | 67.8 | 60.2 | 59.0 | 57.5 | 64.8 | 97.9 | 61.5 | 64.2 | 72.3 | 179.0 | 65.9 | 59.3 | 59.9 | 59.9 | 56.8 | 62.5 | 68.3 | 32.3 | 91.5 | 789.9 | 41.9 | 57.5 | 50.5 |
| us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax | ██▇▇▆▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▄▄▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▂▁▁▁▁ | 1287.7 | 1230.4 | 1214.4 | 1173.9 | 1074.1 | 1182.0 | 1184.4 | 1161.6 | 1135.0 | 1124.0 | 1096.0 | 1067.6 | 1067.7 | 1046.0 | 1008.8 | 981.6 | 966.4 | 957.1 | 949.9 | 926.8 | 920.7 | 909.8 | 879.3 | 778.6 | 764.4 | 740.6 | 613.4 | 596.9 | 604.4 | 591.2 | 572.1 | 564.0 | 564.5 | 572.6 | 552.9 | 537.0 | 533.4 | 538.6 | 518.1 | 497.7 | 505.1 | 538.1 | 490.9 | 460.8 | 467.3 | 491.0 |
| us-gaap:Revenues | ██▇▇▆▇▇▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▄▄▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▂▁▁▁▁ | 1287.7 | 1230.4 | 1214.4 | 1173.9 | 1074.1 | 1182.0 | 1184.4 | 1161.6 | 1135.0 | 1124.0 | 1096.0 | 1067.6 | 1067.7 | 1046.0 | 1008.8 | 981.6 | 966.4 | 957.1 | 949.9 | 926.8 | 920.7 | 909.8 | 879.3 | 778.6 | 764.4 | 740.6 | 613.4 | 596.9 | 604.4 | 591.2 | 572.1 | 564.0 | 564.5 | 572.6 | 552.9 | 537.0 | 533.4 | 538.6 | 518.1 | 497.7 | 505.1 | 538.1 | 490.9 | 460.8 | 467.3 | 491.0 |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
|---|
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:Assets | █████▇▇█▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▄▃▃▃▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁ | 6612.9 | 6542.2 | 6445.9 | 6610.5 | 6502.5 | 6137.7 | 6080.7 | 6386.8 | 5812.1 | 5583.8 | 5175.0 | 5131.9 | 5089.4 | 4939.6 | 4893.7 | 4883.4 | 4840.0 | 4703.8 | 4681.9 | 4631.3 | 4632.6 | 4608.3 | 4606.1 | 4249.3 | 3469.5 | 3577.9 | 3408.8 | 2794.0 | 2576.5 | 2539.1 | 2534.4 | 2556.5 | 2511.7 | 2392.3 | 2423.8 | 2456.2 | 2315.7 | 2295.4 | 2271.2 | 2271.0 | 2377.4 | 2481.1 | 2372.1 | NA | NA | NA |
| us-gaap:Liabilities | ▇█▇██▇▇█▆▆▅▅▅▅▅▅▅▅▆▅▆▆▆▅▃▄▃▂▂▂▂▁▁▁▁▁▁▁▁▁▂▂▂ | 4403.9 | 4467.5 | 4444.3 | 4680.8 | 4637.7 | 4306.5 | 4148.0 | 4505.5 | 3875.5 | 3694.3 | 3356.3 | 3311.7 | 3364.2 | 3300.2 | 3248.2 | 3288.9 | 3301.0 | 3571.3 | 3614.9 | 3608.1 | 3663.2 | 3688.2 | 3705.7 | 3345.0 | 2606.3 | 2759.6 | 2611.4 | 2095.8 | 1915.5 | 1950.7 | 1959.0 | 1758.4 | 1762.7 | 1812.8 | 1677.5 | 1758.0 | 1679.8 | 1696.3 | 1682.2 | 1731.8 | 1893.4 | 2021.4 | 1986.9 | NA | NA | NA |
| us-gaap:LiabilitiesAndStockholdersEquity | █████▇▇█▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▄▃▃▃▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁ | 6612.9 | 6542.2 | 6445.9 | 6610.5 | 6502.5 | 6137.7 | 6080.7 | 6386.8 | 5812.1 | 5583.8 | 5175.0 | 5131.9 | 5089.4 | 4939.6 | 4893.7 | 4883.4 | 4840.0 | 4703.8 | 4681.9 | 4631.3 | 4632.6 | 4608.3 | 4606.1 | 4249.3 | 3469.5 | 3577.9 | 3408.8 | 2794.0 | 2576.5 | 2539.1 | 2534.4 | 2556.5 | 2511.7 | 2392.3 | 2423.8 | 2456.2 | 2315.7 | 2295.4 | 2271.2 | 2271.0 | 2377.4 | 2481.1 | 2372.1 | NA | NA | NA |
| us-gaap:StockholdersEquity | ███▇▇▇▇▇▇▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▁▁▁ | 1762.0 | 1655.1 | 1588.0 | 1520.8 | 1462.8 | 1443.9 | 1352.2 | 1333.1 | 1275.9 | 1314.3 | 1276.7 | 1318.5 | 1254.9 | 1197.0 | 1181.7 | 1136.4 | 1103.7 | 779.7 | 735.9 | 726.3 | 672.7 | 649.5 | 611.4 | 630.4 | 605.9 | 492.3 | 473.2 | 449.6 | 413.7 | 355.6 | 344.6 | 321.1 | 274.8 | 108.3 | 291.6 | 244.7 | 195.8 | 149.4 | 117.0 | 151.8 | 96.6 | 72.3 | -2.2 | -782.3 | -817.3 | -861.9 |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:AssetsCurrent | ▄▅▅▆▆▄▃▅▄▃▃▃▃▃▃▃▃▃▃▃▃▃▂█▃▄▃▄▂▂▂▂▂▂▃▂▁▁▁▁▁▂▁ | 859.3 | 1001.1 | 948.6 | 1174.4 | 1101.7 | 784.5 | 755.8 | 1077.4 | 844.9 | 682.7 | 662.1 | 638.0 | 671.6 | 708.5 | 702.2 | 687.4 | 693.5 | 682.3 | 654.5 | 666.0 | 659.5 | 632.1 | 598.7 | 1463.0 | 712.4 | 866.0 | 686.6 | 783.0 | 580.9 | 585.2 | 580.4 | 575.1 | 591.5 | 597.3 | 636.8 | 548.8 | 424.5 | 431.1 | 391.0 | 410.4 | 428.5 | 521.4 | 406.2 | NA | NA | NA |
| us-gaap:CashAndCashEquivalentsAtCarryingValue | ▁▃▃▅▅▂▂▅▃▁▁▁▁▂▁▁▁▁▁▁▁▁▁█▁▃▁▃▁▁▁▁▁▁▂▂▁▁▁▁▁▂▁▂▂ | 73.2 | 223.9 | 224.0 | 450.0 | 419.0 | 104.9 | 94.8 | 422.0 | 221.7 | 56.1 | 69.2 | 56.9 | 59.0 | 86.4 | 54.4 | 67.6 | 71.1 | 61.2 | 40.5 | 76.4 | 70.3 | 73.2 | 61.6 | 801.6 | 45.5 | 208.3 | 66.7 | 272.3 | 65.8 | 53.1 | 64.5 | 65.0 | 68.7 | 80.1 | 132.8 | 163.2 | 41.1 | 44.3 | 30.1 | 47.7 | 60.3 | 140.7 | 48.3 | 190.4 | 172.6 | NA |
| us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents | ▂▄▄█▇▂▂█▄▁▂▁▁▂▁▂▂▁▁ | 139.8 | 296.3 | 310.9 | 528.1 | 490.0 | 177.0 | 159.6 | 513.8 | 287.7 | 120.2 | 133.5 | 121.0 | 124.8 | 155.8 | 116.8 | 138.4 | 144.1 | 126.8 | 101.4 | NA | NA | NA | 107.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:AccountsReceivableNetCurrent | ██▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▅▄▄▅▄▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁ | 627.5 | 633.6 | 563.0 | 593.3 | 553.2 | 543.4 | 498.7 | 516.9 | 496.0 | 500.6 | 459.9 | 458.0 | 456.6 | 463.1 | 459.5 | 441.6 | 426.5 | 438.0 | 432.0 | 419.2 | 420.6 | 431.9 | 410.5 | 350.9 | 351.8 | 337.9 | 323.2 | 261.6 | 272.3 | 272.7 | 261.8 | 253.4 | 273.7 | 266.3 | 249.3 | 247.5 | 245.7 | 244.0 | 222.8 | 219.2 | 212.8 | 240.9 | 224.9 | NA | NA | NA |
| us-gaap:ReceivablesNetCurrent | NA | NA | 572.8 | NA | NA | NA | 506.1 | NA | NA | NA | 467.7 | NA | NA | NA | 472.1 | NA | NA | NA | 443.8 | NA | NA | NA | 410.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:ReceivablesNetCurrent us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary | NA | NA | 33.1 | NA | NA | NA | 29.3 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:OtherAssetsCurrent | ▃▂▂▂▂▂▃▂▁▁▁▁▃▂▄▇█▇▇▇▇▄▄▄▄▅▃▄▃▄▄▄▄▄▄▅▅▅▅▅▆▅▅ | 93.6 | 81.4 | 86.4 | 73.9 | 73.1 | 79.5 | 97.5 | 71.7 | 70.4 | 67.0 | 66.2 | 61.0 | 90.2 | 89.6 | 113.3 | 178.2 | 195.9 | 183.1 | 170.2 | 170.4 | 168.6 | 127.0 | 126.6 | 124.6 | 126.7 | 131.4 | 108.3 | 110.2 | 103.9 | 120.5 | 115.1 | 119.2 | 111.6 | 113.4 | 117.2 | 138.1 | 137.7 | 142.8 | 138.1 | 143.5 | 155.4 | 139.5 | 132.9 | NA | NA | NA |
| us-gaap:PrepaidExpenseAndOtherAssetsCurrent | NA | NA | 86.4 | NA | NA | NA | 97.5 | NA | NA | NA | 66.2 | NA | NA | NA | 113.3 | NA | NA | NA | 109.3 | NA | NA | NA | 80.7 | NA | NA | NA | 62.7 | NA | NA | NA | 62.7 | NA | NA | NA | 67.9 | NA | NA | NA | 61.2 | NA | NA | NA | 68.4 | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:AssetsNoncurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | NA | NA | 7.7 | NA | NA | NA | 9.3 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:PropertyPlantAndEquipmentNet | NA | NA | NA | 2094.9 | 2041.4 | 2003.3 | 1959.3 | 1874.8 | 1788.1 | 1736.2 | 1634.8 | 1591.0 | 1565.8 | 1554.3 | 1517.1 | 1482.3 | 1452.1 | 1406.1 | 1391.8 | 1353.1 | 1336.9 | 1317.7 | 1310.1 | 1079.1 | 1062.8 | 1012.3 | 1019.7 | 994.6 | 976.5 | 930.7 | 910.5 | 893.5 | 793.3 | 764.2 | 748.0 | 739.3 | 718.9 | 677.2 | 664.4 | 648.8 | 642.5 | 682.5 | 685.4 | NA | NA | NA | |
| us-gaap:PropertyPlantAndEquipmentNet us-gaap:ConsolidatedEntities us-gaap:VariableInterestEntityPrimaryBeneficiary | NA | NA | NA | 121.9 | 120.6 | 120.9 | 122.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | NA | NA | 5.5 | 5.6 | 5.4 | 5.7 | 7.4 | 8.0 | 13.9 | 12.5 | 12.2 | 12.7 | 12.6 | 13.0 | 11.9 | 12.6 | 12.6 | 12.9 | 13.0 | 13.0 | 13.6 | 12.5 | 11.7 | 11.1 | 9.5 | 9.1 | 9.4 | 10.8 | 11.0 | 20.1 | 20.3 | 19.1 | 21.9 | 20.3 | 20.8 | 20.9 | 29.5 | 29.0 | 29.0 | 29.4 | 30.5 | NA | 30.7 | NA | NA | NA | |
| us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:StatementBusinessSegments ehc:HomeHealthandHospiceSegment | NA | NA | 4.0 | 3.9 | NA | NA | 5.4 | 5.3 | 5.3 | 3.1 | 2.7 | 2.9 | 2.8 | 2.8 | 2.6 | NA | NA | NA | 2.4 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures us-gaap:StatementBusinessSegments ehc:InpatientRehabilitationSegment | NA | NA | 1.5 | 1.7 | NA | NA | 2.0 | 2.7 | 8.6 | 9.4 | 9.5 | 9.8 | 9.8 | 10.2 | 9.3 | NA | NA | NA | 10.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:Goodwill | █████▇▇▇▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▁▁▁ | 2412.3 | 2318.7 | 2318.7 | 2318.7 | 2318.7 | 2312.1 | 2305.2 | 2305.2 | 2111.6 | 2111.6 | 2100.8 | 2081.1 | 2074.7 | 1973.1 | 1972.6 | 1971.7 | 1949.6 | 1931.4 | 1927.2 | 1915.6 | 1899.7 | 1891.9 | 1890.1 | 1105.0 | 1097.5 | 1090.0 | NA | 491.7 | NA | 456.9 | 456.9 | 457.2 | 457.2 | 443.4 | 437.3 | 437.3 | 421.7 | 421.7 | 421.7 | 420.3 | 420.3 | 431.3 | 431.3 | NA | NA | NA |
| us-gaap:IntangibleAssetsNetExcludingGoodwill | ▇▇▇▇████▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▅▅▅▅▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁ | 435.5 | 419.2 | 431.3 | 441.9 | 455.8 | 464.7 | 476.3 | 486.8 | 443.6 | 435.4 | 443.4 | 443.2 | 443.4 | 396.1 | 403.1 | 405.1 | 404.8 | 404.4 | 411.3 | 410.1 | 414.2 | 415.8 | 419.4 | 324.7 | 325.5 | 307.6 | 306.1 | 99.9 | 103.3 | 89.6 | 88.2 | 87.3 | 86.8 | 82.7 | 73.2 | 73.6 | 69.0 | 61.0 | 57.7 | 42.8 | 45.1 | 46.5 | 48.8 | NA | NA | NA |
| us-gaap:FiniteLivedIntangibleAssetsNet | NA | NA | 431.3 | NA | NA | NA | 476.3 | NA | NA | NA | 443.4 | NA | NA | NA | 403.1 | NA | NA | NA | 411.3 | NA | NA | NA | 419.4 | NA | NA | NA | 306.1 | NA | NA | NA | 88.2 | NA | NA | NA | 73.2 | NA | NA | NA | 57.7 | NA | NA | NA | 58.5 | NA | NA | NA | |
| us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass ehc:CertificateOfNeed | NA | NA | 142.8 | NA | NA | NA | 156.8 | NA | NA | NA | 120.1 | NA | NA | NA | 94.2 | NA | NA | NA | 85.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass ehc:MarketAccessAssets | NA | NA | 1.8 | NA | NA | NA | 2.2 | NA | NA | NA | 2.7 | NA | NA | NA | 3.2 | NA | NA | NA | 3.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:ComputerSoftwareIntangibleAsset | NA | NA | 42.8 | NA | NA | NA | 57.8 | NA | NA | NA | 72.0 | NA | NA | NA | 69.3 | NA | NA | NA | 71.2 | NA | NA | NA | 65.2 | NA | NA | NA | 50.8 | NA | NA | NA | 41.8 | NA | NA | NA | 29.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:LicensingAgreements | NA | NA | 80.5 | NA | NA | NA | 93.2 | NA | NA | NA | 86.9 | NA | NA | NA | 74.4 | NA | NA | NA | 79.9 | NA | NA | NA | 85.2 | NA | NA | NA | 64.5 | NA | NA | NA | 5.6 | NA | NA | NA | 7.7 | NA | NA | NA | 8.5 | NA | NA | NA | 10.8 | NA | NA | NA | |
| us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:NoncompeteAgreements | NA | NA | 9.4 | NA | NA | NA | 11.9 | NA | NA | NA | 7.0 | NA | NA | NA | 8.1 | NA | NA | NA | 14.9 | NA | NA | NA | 21.0 | NA | NA | NA | 16.8 | NA | NA | NA | 15.4 | NA | NA | NA | 14.0 | NA | NA | NA | 15.9 | NA | NA | NA | 17.7 | NA | NA | NA | |
| us-gaap:FiniteLivedIntangibleAssetsNet us-gaap:FiniteLivedIntangibleAssetsByMajorClass us-gaap:TradeNames | NA | NA | 18.8 | NA | NA | NA | 19.2 | NA | NA | NA | 19.5 | NA | NA | NA | 18.7 | NA | NA | NA | 20.7 | NA | NA | NA | 21.4 | NA | NA | NA | 9.8 | NA | NA | NA | 7.7 | NA | NA | NA | 7.5 | NA | NA | NA | 7.0 | NA | NA | NA | 7.0 | NA | NA | NA | |
| us-gaap:OperatingLeaseRightOfUseAsset | ▇▇▇▇▇▇▇█▇▇▁ | 244.9 | 248.3 | 245.7 | 267.2 | 268.5 | 267.9 | 276.5 | 311.4 | 284.4 | 284.9 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:OtherAssetsNoncurrent | ▇▇███████▇▇█▆▆▆▆▆▆▅▅▅▅▄▅▄▅▄▄▃▃▃▂▃▃▂▂▂▂▁▂▄▂▁ | 269.7 | 274.4 | 295.0 | 305.9 | 305.3 | 303.7 | 304.7 | 308.8 | 296.9 | 292.5 | 291.0 | 296.0 | 258.5 | 239.1 | 235.1 | 245.3 | 237.9 | 244.3 | 221.3 | 213.9 | 206.8 | 205.8 | 197.0 | 222.1 | 191.6 | 199.7 | 183.0 | 169.5 | 148.0 | 151.4 | 144.1 | 130.8 | 138.1 | 144.9 | 135.4 | 130.7 | 128.8 | 124.8 | 99.3 | 126.2 | 178.3 | 125.0 | 90.4 | NA | NA | NA |
| us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel1,us-gaap:FairValueMeasurementsRecurring | ▄ | 3.0 | NA | NA | NA | NA | NA | 0.0 | NA | NA | NA | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurring | █▂▁ | 76.9 | 73.1 | 72.6 | NA | NA | NA | 63.5 | NA | NA | NA | 55.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByFairValueHierarchyLevel,us-gaap:FairValueByMeasurementFrequency,us-gaap:ValuationTechnique us-gaap:FairValueInputsLevel2,us-gaap:FairValueMeasurementsRecurring,us-gaap:MarketApproachValuationTechnique | NA | NA | NA | 70.9 | 69.9 | 61.8 | 63.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency us-gaap:FairValueMeasurementsRecurring | █▁▁ | 79.9 | 73.1 | 72.6 | NA | NA | NA | 63.5 | NA | NA | NA | 55.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:EquitySecuritiesFvNi us-gaap:FairValueByMeasurementFrequency,us-gaap:ValuationTechnique us-gaap:FairValueMeasurementsRecurring,us-gaap:MarketApproachValuationTechnique | NA | NA | NA | 70.9 | 69.9 | 61.8 | 63.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:AccountsPayableCurrent | █▆▆▆▄▅▄▅▅▄▄▄▄▄▃▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▂▂▂▂▁▁▂▂▁▁▁▁▁ | 145.1 | 122.8 | 115.0 | 119.6 | 93.1 | 98.0 | 94.6 | 101.4 | 95.6 | 94.7 | 90.0 | 86.0 | 85.6 | 83.1 | 78.4 | 81.8 | 77.5 | 68.9 | 68.3 | 67.5 | 67.1 | 62.7 | 61.6 | 65.6 | 60.0 | 55.1 | 53.4 | 54.8 | 55.7 | 48.5 | 61.9 | 54.2 | 57.3 | 61.2 | 45.3 | 51.9 | 59.6 | 53.4 | 45.4 | 45.4 | 45.4 | 50.8 | 48.9 | NA | NA | NA |
| us-gaap:LiabilitiesCurrent | ▅▅▅▄▄▄▅█▅▅▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▃▂▃▁▁▁▁▁▁▁▂▁▁▁▁▁▁▂ | 804.5 | 812.2 | 717.3 | 682.5 | 664.4 | 586.2 | 721.0 | 1108.6 | 752.9 | 768.2 | 672.5 | 609.6 | 573.9 | 572.0 | 517.5 | 511.2 | 493.3 | 487.3 | 475.6 | 476.0 | 459.1 | 463.8 | 426.4 | 403.6 | 364.6 | 497.6 | 364.3 | 514.7 | 299.3 | 302.0 | 311.6 | 311.8 | 311.6 | 317.0 | 300.9 | 377.8 | 324.6 | 314.7 | 313.2 | 288.1 | 319.1 | 337.9 | 359.3 | NA | NA | NA |
| us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes05.125Due2023,us-gaap:SeniorNotes | NA | 100.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:OperatingLeaseLiabilityCurrent | ▇▇▇█▇▇▇███▁ | 42.0 | 44.2 | 44.8 | 47.1 | 42.2 | 40.8 | 40.4 | 44.9 | 45.2 | 48.3 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:OtherLiabilitiesCurrent | ▇▇▂▆▇▅▄▇██▄▆▆▆▂▅▅▅▂▅▅▅▂▄▃▄▁▃▃▃▁▃▃▃▁▄▃▃▁▃▃▃▁ | 550.6 | 508.0 | 218.3 | 478.8 | 492.2 | 407.2 | 303.8 | 525.1 | 574.0 | 587.9 | 333.9 | 486.5 | 452.3 | 456.2 | 210.0 | 398.3 | 377.5 | 380.5 | 197.1 | 371.7 | 355.5 | 364.5 | 172.1 | 314.4 | 283.2 | 292.7 | 145.6 | 251.4 | 243.6 | 253.5 | 122.8 | 257.6 | 254.3 | 255.8 | 130.4 | 325.9 | 265.0 | 261.3 | 134.1 | 242.7 | 273.7 | 287.1 | 144.6 | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:LiabilitiesNoncurrent us-gaap:EquityMethodInvestmentNonconsolidatedInvestee us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | NA | NA | 0.2 | NA | NA | NA | 0.3 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LongTermDebt us-gaap:CreditFacility us-gaap:RevolvingCreditFacility | ▄ | 45.0 | NA | NA | NA | 0.0 | 350.0 | 45.0 | 0.0 | 335.0 | NA | 30.0 | NA | NA | NA | 95.0 | 138.0 | 70.0 | 85.0 | 152.0 | 150.0 | NA | NA | 130.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:NotesPayableRealEstateSaleLeasebackFinancing,us-gaap:NotesPayableOtherPayables | NA | NA | 28.0 | NA | NA | NA | 28.0 | NA | NA | NA | 82.8 | NA | NA | NA | 77.7 | NA | NA | NA | 48.2 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes04.750Due2030,us-gaap:SeniorNotes | █████▁▁▁ | 783.9 | 783.5 | 783.2 | 782.8 | 782.5 | 491.8 | 491.7 | 491.5 | NA | NA | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes05.125Due2023,us-gaap:SeniorNotes | ▁████████ | 99.5 | 298.3 | 298.1 | 297.9 | 297.7 | 297.5 | 297.3 | 297.2 | 297.0 | NA | 296.6 | NA | NA | NA | 295.9 | NA | NA | NA | 295.3 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes05.75Due2025,us-gaap:SeniorNotes | █▇▆▅▅▄▃▂▁ | 346.6 | 346.5 | 346.3 | 346.1 | 346.0 | 345.8 | 345.6 | 345.5 | 345.3 | NA | 345.0 | NA | NA | NA | 344.4 | NA | NA | NA | 343.9 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes0575Due2024,us-gaap:SeniorNotes | NA | NA | NA | 697.7 | 697.6 | 697.5 | 697.3 | 1095.6 | 1095.5 | NA | 1194.7 | NA | NA | NA | 1193.9 | NA | NA | NA | 1193.2 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes4.50Due2028,us-gaap:SeniorNotes | █████▁▁ | 785.9 | 785.5 | 785.0 | 784.6 | 784.1 | 491.9 | 491.7 | NA | NA | NA | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:SeniorNotes4625Due2031,us-gaap:SeniorNotes | █▅▁ | 393.4 | 393.3 | 393.2 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType ehc:TermLoanFacilities,us-gaap:LoansPayable | ▁▂▃▃▄▅▆▇█ | 245.1 | 248.3 | 251.6 | 254.8 | 258.0 | 261.9 | 265.2 | 269.1 | 272.8 | NA | 280.1 | NA | NA | NA | 294.7 | NA | NA | NA | 421.2 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType,us-gaap:SubsequentEventType ehc:SeniorNotes0575Due2024,us-gaap:SeniorNotes,us-gaap:SubsequentEvent | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:LongtermDebtType,us-gaap:VariableRate ehc:NotesPayableLIBORplus2.5ConstructionFinancing,us-gaap:NotesPayableOtherPayables,us-gaap:LondonInterbankOfferedRateLIBOR | NA | NA | 11.8 | NA | NA | NA | 12.9 | NA | NA | NA | 14.6 | NA | NA | NA | 4.4 | NA | NA | NA | 7.4 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LongTermDebt us-gaap:LongtermDebtType us-gaap:NotesPayableOtherPayables | █▆▆▆▆▇▇▇▁ | 50.2 | 39.7 | 39.8 | 40.2 | 40.4 | 44.5 | 44.7 | 44.9 | 16.9 | NA | 104.2 | NA | NA | NA | 82.3 | 80.1 | 74.1 | 63.1 | 55.8 | 47.1 | NA | NA | 39.2 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:DebtAndCapitalLeaseObligations | ▅▆▆██▆▄▆▁ | 3172.5 | 3297.2 | 3288.9 | 3576.4 | 3583.6 | 3362.1 | 3062.6 | 3399.1 | 2757.7 | NA | 2514.4 | NA | NA | NA | 2577.7 | 2622.4 | 2663.4 | 2953.4 | 3016.4 | 3010.8 | 3086.5 | 3116.2 | 3171.5 | 2824.3 | 2125.8 | 2272.3 | 2131.6 | 1649.9 | NA | NA | 1517.5 | 1319.9 | 1330.7 | 1377.6 | 1253.5 | 1321.9 | NA | NA | 1254.7 | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LongTermDebtAndCapitalLeaseObligations | ▇▇▇██▇▆▆▅▅▅▅▅▅▅▅▅▆▆▆▆▇▇▆▄▄▄▂▂▂▂▁▁▁▁▁ | 3105.7 | 3160.0 | 3250.6 | 3539.4 | 3546.7 | 3321.9 | 3023.3 | 2961.9 | 2719.6 | 2521.8 | 2478.6 | 2503.9 | 2600.5 | 2544.4 | 2545.4 | 2591.3 | 2625.1 | 2915.5 | 2979.3 | 2974.0 | 3050.0 | 3079.6 | 3134.7 | 2800.7 | 2104.4 | 2122.5 | 2110.8 | 1441.4 | 1475.1 | 1503.1 | 1505.2 | 1306.2 | 1319.7 | 1365.3 | 1239.9 | 1242.3 | NA | NA | 1235.8 | 1308.7 | 1440.1 | NA | 1496.8 | NA | NA | NA |
| us-gaap:DeferredIncomeTaxLiabilitiesNet | █▇▁ | 61.7 | 60.6 | 51.8 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:MinorityInterest | █▇▇▇▇▇▆▆▆▆▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁ | 414.1 | 387.9 | 382.0 | 374.9 | 368.6 | 353.3 | 340.9 | 338.2 | 307.9 | 302.2 | 280.3 | 265.2 | 246.4 | 243.8 | 242.9 | 236.8 | 219.3 | 199.4 | 192.8 | 187.5 | 176.7 | 174.4 | 167.9 | 159.8 | 158.8 | 148.1 | 146.3 | 143.2 | 141.7 | 126.6 | 124.1 | 120.9 | 117.9 | 115.2 | 112.5 | 111.3 | 97.9 | 86.5 | 84.6 | 83.9 | 83.1 | 83.9 | 83.0 | NA | NA | NA |
| us-gaap:OtherLiabilitiesNoncurrent | ██▃█▇▆▁▆▅▆▃▇▇▆▃▆▆▆▂▅▅▅▁▅▅▅▁▅▅▅▁▅▅▅▁▅▅▅▁▅ | 219.1 | 220.5 | 93.8 | 230.0 | 191.7 | 163.3 | 42.7 | 161.6 | 157.2 | 159.3 | 85.6 | 198.2 | 189.8 | 183.8 | 75.2 | 186.4 | 182.6 | 168.5 | 49.6 | 158.1 | 154.1 | 144.8 | 43.0 | 140.7 | 137.3 | 139.5 | 37.6 | 139.7 | 141.1 | 145.6 | 44.0 | 140.4 | 131.4 | 130.5 | 30.2 | 137.9 | 135.8 | 135.4 | 30.4 | 135.0 | NA | NA | 130.8 | NA | NA | NA |
| us-gaap:OperatingLeaseLiabilityNoncurrent | ▆▆▆▇▇▇▇█▇▇▁ | 212.9 | 214.2 | 209.6 | 228.9 | 234.9 | 235.1 | 243.8 | 273.4 | 245.8 | 245.0 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo | NA | NA | 47.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree | NA | NA | 42.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour | NA | NA | 35.6 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive | NA | NA | 26.5 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:StockholdersEquity | ███▇▇▇▇▇▇▇▇▇▇▆▆▆▆▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▄▄▄▄▄▄▄▄▄▃▃▁▁▁ | 1762.0 | 1655.1 | 1588.0 | 1520.8 | 1462.8 | 1443.9 | 1352.2 | 1333.1 | 1275.9 | 1314.3 | 1276.7 | 1318.5 | 1254.9 | 1197.0 | 1181.7 | 1136.4 | 1103.7 | 779.7 | 735.9 | 726.3 | 672.7 | 649.5 | 611.4 | 630.4 | 605.9 | 492.3 | 473.2 | 449.6 | 413.7 | 355.6 | 344.6 | 321.1 | 274.8 | 108.3 | 291.6 | 244.7 | 195.8 | 149.4 | 117.0 | 151.8 | 96.6 | 72.3 | -2.2 | -782.3 | -817.3 | -861.9 |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | ██▇▇▇▇▇▆▆▆▆▆▆▆▆▆▅▄▄▄▄▄▄▄▄▃▃▃▃▃▃▃▂▂▃▂▂▂▂▁▁▁▁ | 2176.1 | 2043.0 | 1970.0 | 1895.7 | 1831.4 | 1797.2 | 1693.1 | 1671.3 | 1583.8 | 1616.5 | 1557.0 | 1583.7 | 1501.3 | 1440.8 | 1424.6 | 1373.2 | 1323.0 | 979.1 | 928.7 | 913.8 | 849.4 | 823.9 | 779.3 | 790.2 | 764.7 | 640.4 | 619.5 | 592.8 | 555.4 | 482.2 | 468.7 | 442.0 | 392.7 | 223.5 | 404.1 | 356.0 | 293.7 | 235.9 | 201.6 | 67.9 | 13.5 | -11.6 | -85.2 | NA | NA | NA |
| us-gaap:CommonStockValue | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.1 | NA | NA | NA | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | NA | NA | NA | 1.0 | NA | NA | NA | 1.0 | NA | NA | NA | |
| us-gaap:AdditionalPaidInCapital | NA | NA | 2326.6 | NA | NA | NA | 2369.9 | NA | NA | NA | 2588.7 | NA | NA | NA | 2791.4 | NA | NA | NA | 2799.1 | NA | NA | NA | 2834.9 | NA | NA | NA | 2810.5 | 2828.0 | 2841.5 | 2849.3 | 2849.4 | 2874.5 | 2886.3 | 2882.3 | 2877.2 | NA | NA | NA | 2874.7 | NA | NA | NA | 2873.5 | NA | NA | NA | |
| us-gaap:RetainedEarningsAccumulatedDeficit | NA | NA | -242.3 | NA | NA | NA | -526.5 | NA | NA | NA | -885.2 | NA | NA | NA | -1191.0 | NA | NA | NA | -1448.4 | NA | NA | NA | -1696.0 | NA | NA | NA | -1879.1 | -1921.2 | -1971.3 | -2054.4 | -2101.1 | -2150.0 | -2208.2 | -2373.4 | -2424.7 | NA | NA | NA | -2609.7 | NA | NA | NA | -2818.4 | NA | NA | NA | |
| us-gaap:TreasuryStockValue | NA | NA | 497.4 | NA | NA | NA | 492.3 | NA | NA | NA | 427.9 | NA | NA | NA | 418.5 | NA | NA | NA | 614.7 | NA | NA | NA | 527.4 | NA | NA | NA | 458.7 | 458.1 | 457.6 | 440.3 | 404.6 | 404.2 | 404.0 | 403.1 | 163.3 | NA | NA | NA | 148.8 | NA | NA | NA | 141.8 | NA | NA | NA | |
| us-gaap:MinorityInterest | █▇▇▇▇▇▆▆▆▆▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁ | 414.1 | 387.9 | 382.0 | 374.9 | 368.6 | 353.3 | 340.9 | 338.2 | 307.9 | 302.2 | 280.3 | 265.2 | 246.4 | 243.8 | 242.9 | 236.8 | 219.3 | 199.4 | 192.8 | 187.5 | 176.7 | 174.4 | 167.9 | 159.8 | 158.8 | 148.1 | 146.3 | 143.2 | 141.7 | 126.6 | 124.1 | 120.9 | 117.9 | 115.2 | 112.5 | 111.3 | 97.9 | 86.5 | 84.6 | 83.9 | 83.1 | 83.9 | 83.0 | NA | NA | NA |
| us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | █▁▂▅▆▄▅▅▆▄▅▄▅▃▄▃▄▁▃▂▃▃▁▂▃▆▂▃▄▄▃▄▄▄▃▄▃▄▃▃▃▂▃▁▂▂ | 12.0 | 2.8 | 4.2 | 8.3 | 9.9 | 7.1 | 8.3 | 7.8 | 9.3 | 7.0 | 8.3 | 7.3 | 8.0 | 5.3 | 6.1 | 5.5 | 6.3 | 3.4 | 5.3 | 4.6 | 5.6 | 5.9 | 3.4 | 4.1 | 5.8 | 9.1 | 4.6 | 5.0 | 7.0 | 7.3 | 5.8 | 6.2 | 6.5 | 6.3 | 6.0 | 6.1 | 5.9 | 6.1 | 5.9 | 4.9 | 5.3 | 4.2 | 5.2 | 3.4 | 4.0 | 3.8 |
| us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | ▆▆▅▆▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▅▄▄▅▅▅▅▄▅█▁▄▅▇▁▄ | 23.0 | 22.4 | 21.2 | 21.8 | 13.6 | 15.5 | 17.4 | 20.2 | 17.3 | 15.3 | 17.4 | 16.9 | 19.1 | 17.7 | 13.4 | 14.2 | 12.4 | 10.5 | 11.1 | 13.2 | 12.8 | 17.1 | 12.3 | 13.3 | 11.0 | 12.4 | 11.2 | 11.4 | 12.0 | 10.3 | 10.3 | 9.7 | 9.8 | 10.6 | 11.2 | 13.7 | 10.8 | 9.7 | 11.0 | 49.7 | -30.0 | 9.8 | 10.9 | 42.7 | -24.9 | 7.9 |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:NetCashProvidedByUsedInOperatingActivities | ▇▅█▅▆▁▆▃▄▅▅▆▅▆▄▅▄▅▃▅▄▅▃▅▃▃▂▄▄▃▃▄▃▄▃▃▃▂▄▂▂▃▂▃▃▃ | 255.9 | 158.5 | 279.7 | 173.4 | 222.3 | 29.3 | 215.6 | 114.4 | 145.4 | 159.9 | 178.4 | 198.5 | 169.2 | 216.3 | 151.4 | 173.8 | 151.2 | 180.8 | 116.0 | 177.6 | 152.2 | 159.7 | 116.6 | 163.3 | 102.9 | 102.0 | 70.2 | 139.6 | 128.0 | 107.1 | 100.9 | 142.6 | 105.4 | 121.4 | 109.3 | 107.2 | 114.0 | 81.0 | 131.9 | 53.9 | 67.8 | 89.1 | 67.1 | 90.8 | 88.3 | 84.8 |
| us-gaap:NetCashProvidedByUsedInInvestingActivities | ▆▇▆▇▇▇▆▅▇▇▇▇▆▇▇▇▇▇▇▇▇▇▁▇▇▇▃▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▇ | -226.0 | -95.6 | -142.7 | -89.7 | -92.1 | -83.0 | -145.7 | -320.1 | -100.1 | -91.5 | -98.2 | -65.3 | -200.4 | -60.6 | -75.3 | -77.6 | -77.8 | -53.8 | -88.7 | -50.8 | -66.0 | -39.5 | -950.4 | -52.7 | -81.0 | -45.7 | -714.6 | -55.3 | -39.2 | -67.8 | -29.0 | -95.8 | -53.5 | -47.9 | -54.5 | -36.0 | -55.4 | -32.9 | -57.3 | 81.9 | -25.8 | -23.4 | -35.1 | -50.7 | -13.9 | -26.2 |
| us-gaap:NetCashProvidedByUsedInFinancingActivities | ▃▃▁▃▅▄▁▇▅▃▃▃▄▃▃▃▃▃▃▃▃▃▄█▃▄▇▅▃▃▃▃▃▃▃▄▃▄▃▃▃▄▃▄▄▄ | -186.39999999999998 | -77.5 | -354.2 | -45.6 | 182.8 | 71.1 | -424.1 | 431.8 | 122.2 | -81.7 | -67.7 | -137.0 | 0.2 | -116.7 | -89.3 | -99.7 | -63.5 | -106.3 | -63.2 | -120.7 | -89.1 | -108.6 | 93.8 | 645.5 | -184.7 | 85.3 | 438.8 | 122.2 | -76.1 | -50.7 | -72.4 | -50.5 | -63.3 | -126.2 | -85.2 | 50.8 | -61.7 | -33.9 | -92.2 | -148.4 | -122.7 | 26.9 | -174.1 | -22.2 | -18.7 | -22.7 |
| us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect | ▃▅▂▅█▅▁▇ | -156.5 | -14.6 | -217.2 | 38.1 | 313.0 | 17.4 | -354.2 | 226.1 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:DeferredIncomeTaxExpenseBenefit | ▇███▇███▇█▇▇▇▇██▇███████████████▇████████▇▁▇█▇ | -2.5 | 8.7 | 58.1 | 3.4 | -10.5 | 1.4 | 19.2 | 20.3 | -2.1 | 2.6 | -1.1 | -4.4 | -0.6 | -3.0 | 24.3 | 7.1 | -4.8 | 49.0 | 22.3 | 37.4 | 38.5 | 34.7 | 39.1 | 32.4 | 28.8 | 26.8 | 15.8 | 18.9 | 33.5 | 29.2 | 27.2 | 32.7 | -85.2 | 31.7 | 22.3 | 28.7 | 24.7 | 27.0 | 13.1 | 18.2 | 8.6 | -3.4 | -740.9 | 0.3 | 1.7 | 0.4 |
| us-gaap:DepreciationDepletionAndAmortization | █████▇▇▇▆▆▆▆▆▅▅▅▅▅▅▅▅▅▅▃▃▃▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▂▁▁▁ | 63.4 | 62.5 | 62.3 | 61.2 | 60.7 | 58.8 | 58.4 | 55.1 | 52.7 | 52.5 | 52.9 | 51.2 | 49.7 | 45.9 | 46.6 | 46.2 | 45.8 | 45.2 | 43.8 | 43.5 | 42.9 | 42.4 | 41.4 | 33.7 | 32.7 | 31.9 | 27.5 | 27.4 | 26.4 | 26.4 | 25.2 | 24.3 | 23.1 | 22.1 | 21.7 | 21.3 | 20.0 | 19.5 | 20.2 | 19.5 | 19.6 | 20.3 | 22.7 | 18.4 | 17.8 | 18.3 |
| us-gaap:IncreaseDecreaseInAccountsPayable | NA | NA | 3.3 | 10.7 | NA | NA | -1.9 | 0.3 | NA | NA | 6.6 | 0.4 | -1.7 | 1.3 | 1.4 | 6.5 | 1.3 | -1.7 | 4.4 | 0.7 | 0.6 | 0.6 | -3.5 | 2.7 | -0.4 | 2.1 | 1.7 | 1.0 | 0.1 | 2.6 | -3.5 | 0.4 | -2.6 | 12.1 | -5.8 | -8.9 | 4.3 | 6.0 | 0.0 | 0.0 | -1.1 | 1.9 | -0.9 | 1.8 | 0.7 | -2.9 | |
| us-gaap:IncreaseDecreaseInAccountsReceivable | ▂█▁▆▄▇▂▅▃▆▄▃▄▃▆▆▄▅█▅▅▇█▅▆▇▇▅▅▆▆▃▅▆▄▄▄▆▄▅▃▅▅▃▃▅ | -17.0 | 55.1 | -33.7 | 33.3 | 1.9 | 36.6 | -14.9 | 15.2 | -7.0 | 29.6 | 5.3 | -2.4 | -1.6 | -8.3 | 29.7 | 27.7 | 6.5 | 20.0 | 51.8 | 16.2 | 13.8 | 45.7 | 50.4 | 21.6 | 24.8 | 37.3 | 42.9 | 13.1 | 10.9 | 24.7 | 28.6 | -12.3 | 14.5 | 24.3 | 9.0 | 6.6 | 8.2 | 27.5 | 9.7 | 11.5 | -5.5 | 21.4 | 12.1 | -5.5 | -4.2 | 21.3 |
| us-gaap:NetCashProvidedByUsedInOperatingActivities | ▇▅█▅▆▁▆▃▄▅▅▆▅▆▄▅▄▅▃▅▄▅▃▅▃▃▂▄▄▃▃▄▃▄▃▃▃▂▄▂▂▃▂▃▃▃ | 255.9 | 158.5 | 279.7 | 173.4 | 222.3 | 29.3 | 215.6 | 114.4 | 145.4 | 159.9 | 178.4 | 198.5 | 169.2 | 216.3 | 151.4 | 173.8 | 151.2 | 180.8 | 116.0 | 177.6 | 152.2 | 159.7 | 116.6 | 163.3 | 102.9 | 102.0 | 70.2 | 139.6 | 128.0 | 107.1 | 100.9 | 142.6 | 105.4 | 121.4 | 109.3 | 107.2 | 114.0 | 81.0 | 131.9 | 53.9 | 67.8 | 89.1 | 67.1 | 90.8 | 88.3 | 84.8 |
| us-gaap:NetIncomeLoss | ▂▂▂▂▁▂▁▂▂▂▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▂█▁▁▁ | 113.3 | 107.3 | 86.0 | 77.7 | 33.5 | 87.0 | 67.6 | 97.6 | 91.2 | 102.3 | 28.1 | 88.6 | 91.8 | 83.8 | 60.6 | 65.9 | 63.0 | 66.8 | 65.3 | 61.7 | 62.6 | 58.0 | 47.0 | 50.7 | 42.9 | 42.5 | 42.1 | 50.1 | 83.1 | 46.7 | 48.9 | 58.2 | 165.2 | 51.3 | 47.0 | 47.1 | 46.7 | 44.2 | 50.0 | 57.0 | 21.9 | 79.8 | 779.2 | 31.8 | 47.3 | 40.7 |
| us-gaap:ProfitLoss | ▂▂▂▂▁▂▂▂▂▂▁▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▂▁▁▁▂▁▁▁▁▁▁▁▁▂█▁▁▁ | 142.0 | 132.8 | 111.7 | 100.1 | 48.3 | 108.7 | 90.2 | 119.5 | 110.9 | 125.2 | 47.7 | 109.3 | 113.2 | 105.2 | 86.5 | 85.1 | 79.4 | 84.4 | 82.1 | 78.1 | 81.2 | 76.7 | 65.8 | 67.8 | 60.2 | 59.0 | 57.5 | 64.8 | 97.9 | 61.5 | 64.2 | 72.3 | 179.0 | 65.9 | 59.3 | 59.9 | 59.9 | 56.8 | 62.5 | 68.3 | 32.3 | 91.5 | 789.9 | 41.9 | 57.5 | 50.5 |
| us-gaap:ShareBasedCompensation | ▂▁▁▂▂▂▅▄█▄▄▃▄▅▂▂▄▂▂▁▂▁▁▂▂▂▁▁▂▂▁▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁ | 12.0 | 2.8 | 4.2 | 8.3 | 9.9 | 7.1 | 27.4 | 21.7 | 45.9 | 19.4 | 20.3 | 18.1 | 21.4 | 26.1 | 9.8 | 9.2 | 20.7 | 8.0 | 10.0 | 4.3 | 8.6 | 4.5 | 4.4 | 6.2 | 6.2 | 9.4 | 4.6 | 5.0 | 7.0 | 7.3 | 5.8 | 6.2 | 6.5 | 6.3 | 6.0 | 6.1 | 5.9 | 6.1 | 5.9 | 4.9 | 5.3 | 4.2 | 5.2 | 3.4 | 4.0 | 3.8 |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:NetCashProvidedByUsedInInvestingActivities | ▆▇▆▇▇▇▆▅▇▇▇▇▆▇▇▇▇▇▇▇▇▇▁▇▇▇▃▇▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▇ | -226.0 | -95.6 | -142.7 | -89.7 | -92.1 | -83.0 | -145.7 | -320.1 | -100.1 | -91.5 | -98.2 | -65.3 | -200.4 | -60.6 | -75.3 | -77.6 | -77.8 | -53.8 | -88.7 | -50.8 | -66.0 | -39.5 | -950.4 | -52.7 | -81.0 | -45.7 | -714.6 | -55.3 | -39.2 | -67.8 | -29.0 | -95.8 | -53.5 | -47.9 | -54.5 | -36.0 | -55.4 | -32.9 | -57.3 | 81.9 | -25.8 | -23.4 | -35.1 | -50.7 | -13.9 | -26.2 |
| us-gaap:PaymentsToAcquirePropertyPlantAndEquipment | ▇▆█▅▅▅▆▆▅▄▅▄▃▄▄▃▃▃▄▃▂▂▃▂▂▁▂▃▂▃▂▆▂▂▂▂▃▂▂▂▁▁▁▁▁▁ | 113.9 | 98.8 | 139.8 | 89.6 | 83.1 | 83.5 | 112.5 | 104.1 | 83.5 | 72.3 | 83.0 | 62.7 | 48.9 | 59.9 | 70.1 | 55.8 | 58.7 | 41.2 | 63.8 | 42.5 | 40.0 | 31.4 | 43.2 | 38.9 | 28.6 | 17.7 | 37.0 | 44.4 | 32.9 | 56.6 | 28.4 | 97.8 | 38.9 | 30.1 | 28.3 | 29.7 | 55.6 | 27.2 | 38.4 | 26.4 | 20.2 | 15.3 | 22.1 | 19.7 | 15.1 | 14.0 |
| us-gaap:PaymentsToAcquireProductiveAssets us-gaap:StatementBusinessSegments ehc:HomeHealthandHospiceSegment | ▄▂▂▁▁▃▃▅▆▇▆▃▇▃█▃▄▃ | 2.2 | 0.9 | 1.0 | 0.5 | 0.6 | 1.5 | 1.6 | 3.1 | 3.5 | 4.5 | 3.9 | 1.7 | 4.3 | 1.7 | 5.1 | 1.7 | 2.2 | 1.7 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:PaymentsToAcquireProductiveAssets us-gaap:StatementBusinessSegments ehc:InpatientRehabilitationSegment | ▆▅█▄▄▄▇▅▄▃▄▃▂▂▃▂▂▁ | 120.4 | 99.8 | 141.99999999999997 | 90.4 | 88.9 | 83.3 | 125.4 | 103.6 | 92.0 | 70.4 | 83.5 | 64.5 | 54.4 | 62.2 | 73.3 | 59.1 | 62.6 | 43.1 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:NetCashProvidedByUsedInFinancingActivities | ▃▃▁▃▅▄▁▇▅▃▃▃▄▃▃▃▃▃▃▃▃▃▄█▃▄▇▅▃▃▃▃▃▃▃▄▃▄▃▃▃▄▃▄▄▄ | -186.39999999999998 | -77.5 | -354.2 | -45.6 | 182.8 | 71.1 | -424.1 | 431.8 | 122.2 | -81.7 | -67.7 | -137.0 | 0.2 | -116.7 | -89.3 | -99.7 | -63.5 | -106.3 | -63.2 | -120.7 | -89.1 | -108.6 | 93.8 | 645.5 | -184.7 | 85.3 | 438.8 | 122.2 | -76.1 | -50.7 | -72.4 | -50.5 | -63.3 | -126.2 | -85.2 | 50.8 | -61.7 | -33.9 | -92.2 | -148.4 | -122.7 | 26.9 | -174.1 | -22.2 | -18.7 | -22.7 |
| us-gaap:PaymentsOfDividendsCommonStock | ███████▇▇█▇▇▇▇▇▇▆▆▆▆▆▆▆▆▅▅▅▅▅▅▅▁▁▁ | 27.8 | 29.1 | 27.6 | 27.6 | 27.7 | 29.0 | 27.4 | 26.4 | 26.6 | 28.3 | 26.4 | 24.5 | 24.5 | 25.4 | 24.5 | 23.5 | 21.3 | 22.2 | 21.4 | 20.5 | 20.6 | 21.3 | 20.9 | 19.2 | 18.5 | 18.6 | 18.4 | 15.8 | 15.8 | 15.8 | 15.7 | 0.0 | 0.0 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA |
| us-gaap:PaymentsForRepurchaseOfCommonStock | NA | NA | 1.2 | 0.0 | NA | NA | 0.0 | 2.1 | NA | NA | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 20.0 | 0.0 | 18.1 | 41.5 | 0.0 | 11.2 | 12.9 | 45.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 16.8 | 26.3 | 0.0 | 0.0 | 1.5 | 232.6 | 0.0 | 0.0 | 0.0 | 0.0 | NA | NA | NA | NA | NA | NA | NA | NA |
| 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
|---|
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 1100000.0 | 1100000.0 | 1100000.0 | 1100000.0 | 1100000.0 | 1100000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 |
| Percentage of CommonStockValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | 2009-12-31 | 2008-12-31 | 2007-12-31 |
| Value | 99 | 99 | 99 | 99 | 99 | 99 | 98 | 98 | 98 | 99 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 89 | 88 | 89 | 89 | 90 | 90 | 91 | 91 | 88 | 87 | 87 | 87 | 88 | 88 | 87 | 87 | 87 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 95 | 93 | 93 | 93 | 93 | 93 | 88 | 78 |
| Percentage of CommonStockSharesOutstanding | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 100 | 100 | 99 | 99 | 99 | 99 | 99 | 99 | 100 | 99 | 99 | 99 | 98 | 99 | 99 | 99 | 99 | 101 | 101 | 101 | 100 | 100 | 100 | 100 | 99 | 107 | 108 | 108 | 108 | 109 | 109 | 109 | 108 | 108 | 108 |
| Percentage of WeightedAverageNumberOfDilutedSharesOutstanding | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 99 | 99 | 98 | 98 | 98 | 97 | 98 | 98 | 98 | 97 | 97 | 97 | 90 | 88 | 89 | 89 | 89 | 90 | 89 | 87 | 86 | 86 | 87 | 86 | 86 | 94 | 94 | 94 | 94 | 93 | 93 | 93 | 92 | 92 | 92 |
| Percentage of WeightedAverageNumberOfSharesOutstandingBasic | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1.14 | 1.08 | 0.87 | 0.78 | 0.34 | 0.88 | 0.69 | 0.99 | 0.93 | 1.04 | 0.29 | 0.9 | 0.93 | 0.85 | 0.62 | 0.67 | 0.7 | 0.75 | 0.73 | 0.69 | 0.7 | 0.65 | 0.52 | 0.56 | 0.47 | 0.47 | 0.46 | 0.55 | 0.93 | 0.51 | -0.31 | 0.6 | 1.85 | 0.49 | 0.44 | 0.44 | 0.43 | 0.39 | 0.47 | 0.54 | 0.17 | 0.79 | 8.33 | 0.27 | 0.44 | 0.37 |
| Percentage of EarningsPerShareBasic | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1.13 | 1.07 | 0.86 | 0.78 | 0.34 | 0.87 | 0.68 | 0.98 | 0.92 | 1.03 | 0.28 | 0.89 | 0.92 | 0.84 | 0.61 | 0.67 | 0.7 | 0.7 | 0.68 | 0.64 | 0.65 | 0.61 | 0.49 | 0.52 | 0.45 | 0.44 | 0.44 | 0.52 | 0.85 | 0.48 | -0.31 | 0.58 | 1.66 | 0.48 | 0.44 | 0.44 | 0.43 | 0.39 | 0.46 | 0.54 | 0.17 | 0.73 | 7.16 | 0.27 | 0.44 | 0.37 |
| Percentage of EarningsPerShareDiluted | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1.14 | 1.08 | 0.87 | 0.78 | 0.34 | 0.88 | 0.69 | 0.99 | 0.93 | 1.05 | 0.27 | 0.9 | 0.93 | 0.86 | 0.62 | 0.67 | 0.7 | 0.75 | 0.73 | 0.69 | 0.7 | 0.65 | 0.51 | 0.56 | 0.49 | 0.47 | 0.43 | 0.56 | 0.89 | 0.51 | -0.31 | 0.61 | 1.85 | 0.49 | 0.42 | 0.44 | 0.39 | 0.4 | 0.52 | 0.17 | 0.14 | 0.63 | 8.31 | 0.24 | 0.4 | 0.4 |
| Percentage of IncomeLossFromContinuingOperationsPerBasicShare | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1.13 | 1.07 | 0.86 | 0.78 | 0.34 | 0.87 | 0.68 | 0.98 | 0.92 | 1.04 | 0.26 | 0.89 | 0.92 | 0.85 | 0.61 | 0.67 | 0.7 | 0.7 | 0.68 | 0.64 | 0.65 | 0.61 | 0.48 | 0.52 | 0.47 | 0.44 | 0.41 | 0.53 | 0.81 | 0.48 | -0.31 | 0.59 | 1.66 | 0.48 | 0.42 | 0.44 | 0.39 | 0.4 | 0.5 | 0.17 | 0.14 | 0.6 | 7.15 | 0.24 | 0.4 | 0.4 |
| Percentage of IncomeLossFromContinuingOperationsPerDilutedShare | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 28 | 88 | 91 | 83 | 60 | 65 | 63 | 67 | 65 | 61 | 62 | 58 | 46 | 49 | 43 | 42 | 41 | 50 | 83 | 46 | 49 | 58 | 163 | 51 | 46 | 48 | 46 | 45 | 49 | 56 | 22 | 80 | 778 | 37 | 46 | 37 |
| Percentage of ComprehensiveIncomeNetOfTax | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.8 | 8.7 | 7.1 | 6.6 | 3.1 | 7.4 | 5.7 | 8.4 | 8.0 | 9.1 | 2.6 | 8.3 | 8.6 | 8.0 | 6.0 | 6.7 | 6.5 | 7.0 | 6.9 | 6.6 | 6.8 | 6.4 | 5.3 | 6.4 | 5.6 | 5.8 | 6.8 | 8.4 | 13.8 | 7.9 | 8.6 | 10.3 | 28.9 | 9.0 | 8.4 | 9.0 | 8.8 | 8.4 | 9.6 | 11.3 | 4.4 | 14.9 | 158.6 | 8.1 | 9.9 | 7.7 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 28 | 25 | 25 | 22 | 14 | 21 | 22 | 21 | 19 | 22 | 19 | 20 | 21 | 21 | 25 | 19 | 16 | 17 | 16 | 16 | 18 | 18 | 18 | 17 | 17 | 16 | 15 | 14 | 14 | 14 | 15 | 14 | 13 | 14 | 12 | 12 | 13 | 12 | 12 | 11 | 10 | 11 | 10 | 10 | 10 | 9.8 |
| Percentage of ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.2 | 2.1 | 2.1 | 1.9 | 1.4 | 1.8 | 1.9 | 1.9 | 1.7 | 2.0 | 1.8 | 1.9 | 2.0 | 2.0 | 2.6 | 2.0 | 1.7 | 1.8 | 1.8 | 1.8 | 2.0 | 2.1 | 2.1 | 2.2 | 2.3 | 2.2 | 2.5 | 2.5 | 2.4 | 2.5 | 2.7 | 2.5 | 2.4 | 2.5 | 2.2 | 2.4 | 2.5 | 2.3 | 2.4 | 2.3 | 2.1 | 2.2 | 2.2 | 2.2 | 2.2 | 2.0 |
| Period End | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 132 | 111 | 100 | 48 | 108 | 90 | 119 | 110 | 125 | 47 | 109 | 113 | 105 | 86 | 85 | 79 | 84 | 81 | 78 | 81 | 76 | 65 | 67 | 60 | 59 | 57 | 64 | 98 | 61 | 64 | 72 | 177 | 66 | 58 | 61 | 60 | 57 | 62 | 67 | 32 | 91 | 789 | 47 | 56 | 47 |
| Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 10.8 | 9.2 | 8.5 | 4.5 | 9.2 | 7.6 | 10.3 | 9.8 | 11.1 | 4.4 | 10.2 | 10.6 | 10.1 | 8.5 | 8.7 | 8.2 | 8.8 | 8.6 | 8.4 | 8.8 | 8.4 | 7.5 | 8.6 | 7.9 | 8.0 | 9.3 | 10.8 | 16.2 | 10.4 | 11.2 | 12.8 | 31.4 | 11.5 | 10.6 | 11.4 | 11.3 | 10.7 | 12.0 | 13.6 | 6.4 | 17.0 | 160.7 | 10.2 | 12.0 | 9.7 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1068 | 1022 | 1021 | 1001 | 974 | 1001 | 1021 | 989 | 964 | 936 | 985 | 894 | 891 | 876 | 841 | 820 | 811 | 795 | 775 | 749 | 738 | 732 | 713 | 632 | 615 | 608 | 496 | 475 | 467 | 467 | 449 | 424 | 445 | 444 | 440 | 426 | 424 | 426 | 416 | 410 | 406 | 434 | 509 | 385 | 388 | 403 |
| Percentage of CostsAndExpenses | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 83.0 | 83.1 | 84.1 | 85.3 | 90.8 | 84.8 | 86.3 | 85.2 | 85.0 | 83.3 | 89.9 | 83.8 | 83.5 | 83.8 | 83.4 | 83.6 | 84.0 | 83.1 | 81.7 | 80.9 | 80.3 | 80.5 | 81.1 | 81.2 | 80.5 | 82.2 | 81.0 | 79.6 | 77.3 | 79.1 | 78.5 | 75.3 | 79.0 | 77.7 | 79.7 | 79.3 | 79.5 | 79.3 | 80.4 | 82.4 | 80.4 | 80.8 | 103.7 | 83.7 | 83.1 | 82.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 225 | 219 | 225 | 222 | 235 | 231 | 237 | 236 | 209 | 205 | 204 | 197 | 189 | 170 | 174 | 161 | 155 | 154 |
| Percentage of CostsAndExpenses | 21.1 | 21.5 | 22.1 | 22.2 | 24.1 | 23.1 | 23.2 | 23.8 | 21.7 | 21.9 | 20.7 | 22.0 | 21.3 | 19.5 | 20.8 | 19.6 | 19.1 | 19.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 17.5 | 17.8 | 18.6 | 19.0 | 21.9 | 19.6 | 20.0 | 20.3 | 18.5 | 18.3 | 18.6 | 18.5 | 17.8 | 16.3 | 17.3 | 16.4 | 16.1 | 16.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:HomeHealthandHospiceSegment | 78.9 | 81.1 | 0.0 | 81.1 | 94.2 | 84.7 | 0.0 | 81.6 | 80.3 | 80.9 | 0.0 | 81.4 | 81.5 | 82.9 | 0.0 | 81.3 | 82.2 | 86.2 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 722 | 702 | 694 | 671 | 633 | 671 | 654 | 644 | 623 | 624 | 618 | 597 | 594 | 598 | 579 | 569 | 556 | 558 |
| Percentage of CostsAndExpenses | 67.6 | 68.7 | 68.0 | 67.0 | 64.9 | 67.1 | 64.1 | 65.1 | 64.7 | 66.6 | 62.7 | 66.8 | 66.7 | 68.3 | 68.9 | 69.4 | 68.5 | 70.2 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 56.1 | 57.1 | 57.2 | 57.2 | 58.9 | 56.8 | 55.3 | 55.5 | 55.0 | 55.5 | 56.4 | 56.0 | 55.6 | 57.2 | 57.4 | 58.0 | 57.6 | 58.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:InpatientRehabilitationSegment | 72.1 | 73.2 | 0.0 | 74.6 | 76.8 | 73.9 | 0.0 | 73.9 | 71.4 | 71.7 | 0.0 | 72.4 | 71.2 | 71.2 | 0.0 | 72.7 | 71.6 | 71.8 |
| Period End | 2021-06-30 | 2020-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2010-12-31 | 2010-09-30 | 2010-06-30 |
| Value | -1.0 | 0.0 | -5.4 | 0.0 | -2.3 | 0.0 | 0.0 | 0.0 | 0.0 | -0.3 | -10.4 | 0.0 | 0.0 | -2.6 | -2.0 | -2.4 | -2.4 | 0.0 | -18.8 | -1.2 | -13.2 | 0.0 | 0.0 | 0.0 | -2.4 | 0.0 | -2.7 | -1.3 | 0.0 | 0.0 | -12.7 | -26.1 | 11 | 0.0 | -0.1 |
| Percentage of GainsLossesOnExtinguishmentOfDebt | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -0.1 | 0.0 | -0.5 | 0.0 | -0.2 | 0.0 | 0.0 | 0.0 | 0.0 | -0.0 | -1.1 | 0.0 | 0.0 | -0.3 | -0.2 | -0.3 | -0.3 | 0.0 | -2.5 | -0.2 | -2.2 | 0.0 | 0.0 | 0.0 | -0.4 | 0.0 | -0.5 | -0.2 | 0.0 | 0.0 | -2.6 | -5.2 | 2.4 | 0.0 | -0.0 |
| Period End | 2021-06-30 | 2020-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | -1.0 | 0.0 | -5.4 | 0.0 | -2.3 | 0.0 | 0.0 | 0.0 | 0.0 | -0.3 | -10.4 | 0.0 | 0.0 | -2.6 | -2.4 | -2.4 | -2.4 | 0.0 |
| Percentage of GainsLossesOnExtinguishmentOfDebt | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 120.0 | 100.0 | 100.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -0.1 | 0.0 | -0.5 | 0.0 | -0.2 | 0.0 | 0.0 | 0.0 | 0.0 | -0.0 | -1.1 | 0.0 | 0.0 | -0.3 | -0.3 | -0.3 | -0.3 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 |
| Value | -1.0 |
| Percentage of GainsLossesOnExtinguishmentOfDebt | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -0.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:SeniorNotes05.125Due2023 us-gaap:SeniorNotes | 0.0 |
| Period End | 2021-06-30 |
| Value | -0.6 |
| Percentage of GainsLossesOnExtinguishmentOfDebt | 60.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioForecast ehc:SeniorNotes05.125Due2023 us-gaap:SeniorNotes | 0.0 |
| Period End | 2020-12-31 |
| Value | -2.0 |
| Percentage of GainsLossesOnExtinguishmentOfDebt | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -0.2 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ScenarioForecast ehc:SeniorNotes0575Due2024 us-gaap:SeniorNotes us-gaap:SubsequentEvent | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 54 | 38 | 37 | 39 | 43 | 35 | 64 | 52 | 77 | 53 | 54 | 49 | 54 | 61 | 43 | 39 | 52 | 36 | 36 | 30 | 34 | 31 | 36 | 30 | 32 | 34 | 36 | 27 | 30 | 30 | 30 | 28 | 29 | 30 | 30 | 29 | 28 | 30 | 29 | 26 | 27 | 26 | 28 | 24 | 26 | 26 |
| Percentage of GeneralAndAdministrativeExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 4.2 | 3.1 | 3.1 | 3.3 | 4.0 | 3.0 | 5.4 | 4.5 | 6.8 | 4.8 | 5.0 | 4.7 | 5.1 | 5.8 | 4.3 | 4.0 | 5.4 | 3.8 | 3.9 | 3.3 | 3.7 | 3.5 | 4.1 | 3.9 | 4.2 | 4.7 | 5.9 | 4.6 | 5.0 | 5.2 | 5.3 | 5.1 | 5.2 | 5.3 | 5.5 | 5.5 | 5.2 | 5.6 | 5.8 | 5.3 | 5.4 | 5.0 | 5.8 | 5.4 | 5.7 | 5.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | 54 | 38 | 37 | 39 | 43 | 35 | 64 | 52 | 77 | 53 | 54 | 49 | 54 | 61 | 300 | -39.7 | -52.4 | -36.5 | 36 | 30 | -34.4 | -31.9 | 36 | 30 |
| Percentage of GeneralAndAdministrativeExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 696.8 | -100.0 | -100.0 | -100.0 | 100.0 | 100.0 | -100.0 | -100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 4.2 | 3.1 | 3.1 | 3.3 | 4.0 | 3.0 | 5.4 | 4.5 | 6.8 | 4.8 | 5.0 | 4.7 | 5.1 | 5.8 | 29.8 | -4.0 | -5.4 | -3.8 | 3.9 | 3.3 | -3.7 | -3.5 | 4.1 | 3.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 26 | 88 | 91 | 84 | 60 | 66 | 62 | 67 | 65 | 61 | 62 | 58 | 46 | 50 | 44 | 42 | 39 | 51 | 79 | 46 | 48 | 59 | 165 | 51 | 45 | 47 | 43 | 44 | 55 | 22 | 19 | 65 | 787 | 28 | 43 | 43 |
| Percentage of IncomeLossFromContinuingOperations | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.8 | 8.7 | 7.1 | 6.6 | 3.1 | 7.4 | 5.7 | 8.4 | 8.0 | 9.1 | 2.4 | 8.3 | 8.6 | 8.1 | 6.0 | 6.7 | 6.5 | 7.0 | 6.8 | 6.7 | 6.8 | 6.4 | 5.3 | 6.5 | 5.8 | 5.8 | 6.4 | 8.5 | 13.1 | 7.9 | 8.5 | 10.5 | 29.2 | 9.0 | 8.2 | 8.9 | 8.1 | 8.3 | 10.6 | 4.5 | 3.8 | 12.2 | 160.5 | 6.2 | 9.4 | 8.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 |
| Value | 28 | 25 | 22 | 14 | 21 | 21 | 19 | 22 | 19 | 20 | 21 | 21 | 25 | 19 | 16 | 17 | 16 | 16 | 18 | 18 | 18 | 17 | 17 | 16 | 15 | 14 | 14 | 14 | 15 | 14 | 13 | 14 | 12 | 12 | 13 | 12 | 12 | 11 | 11 | 11 | 10 | 10 | 10 |
| Percentage of IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.2 | 2.1 | 1.9 | 1.4 | 1.8 | 1.9 | 1.7 | 2.0 | 1.8 | 1.9 | 2.0 | 2.0 | 2.6 | 2.0 | 1.7 | 1.8 | 1.8 | 1.8 | 2.0 | 2.1 | 2.1 | 2.2 | 2.3 | 2.2 | 2.5 | 2.5 | 2.4 | 2.5 | 2.7 | 2.5 | 2.4 | 2.5 | 2.2 | 2.4 | 2.5 | 2.3 | 2.4 | 2.3 | 2.2 | 2.2 | 2.2 | 2.2 | 2.2 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 |
| Value | 181 | 167 | 149 | 127 | 60 | 135 | 117 | 153 | 134 | 156 | 75 | 139 | 142 | 135 | 135 | 128 | 107 | 124 | 121 | 120 | 123 | 116 | 108 | 103 | 94 | 89 | 74 | 87 | 130 | 94 | 94 | 108 | 92 | 99 | 81 | 88 | 83 | 86 | 82 | 51 |
| Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 14.1 | 13.6 | 12.3 | 10.8 | 5.6 | 11.5 | 9.9 | 13.2 | 11.9 | 13.9 | 6.9 | 13.1 | 13.3 | 13.0 | 13.5 | 13.1 | 11.2 | 13.0 | 12.8 | 13.0 | 13.4 | 12.8 | 12.4 | 13.3 | 12.3 | 12.1 | 12.1 | 14.7 | 21.6 | 16.0 | 16.5 | 19.2 | 16.4 | 17.4 | 14.8 | 16.5 | 15.6 | 16.0 | 16.0 | 10.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 142 | 132 | 111 | 100 | 48 | 108 | 90 | 119 | 111 | 125 | 46 | 109 | 113 | 105 | 86 | 85 | 79 | 84 | 81 | 78 | 81 | 76 | 65 | 67 | 61 | 59 | 54 | 65 | 94 | 61 | 64 | 73 | 178 | 66 | 57 | 60 | 56 | 57 | 67 | 33 | 30 | 77 | 788 | 38 | 54 | 53 |
| Percentage of IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 11.1 | 10.8 | 9.2 | 8.5 | 4.5 | 9.2 | 7.6 | 10.3 | 9.8 | 11.2 | 4.2 | 10.2 | 10.6 | 10.1 | 8.6 | 8.7 | 8.2 | 8.8 | 8.6 | 8.4 | 8.8 | 8.4 | 7.4 | 8.7 | 8.1 | 8.0 | 8.9 | 11.0 | 15.6 | 10.4 | 11.2 | 13.0 | 31.7 | 11.6 | 10.4 | 11.2 | 10.6 | 10.6 | 13.0 | 6.8 | 6.1 | 14.3 | 160.6 | 8.4 | 11.6 | 10.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 39 | 34 | 38 | 26 | 11 | 27 | 27 | 34 | 23 | 30 | 29 | 30 | 29 | 30 | 49 | 43 | 28 | 39 | 39 | 42 | 42 | 39 | 43 | 35 | 32 | 30 | 19 | 22 | 36 | 32 | 30 | 35 | -86.5 | 33 | 24 | 28 | 26 | 29 | 15 | 18 | 11 | -5.6 | -741.5 | -0.4 | -1.3 | 2.5 |
| Percentage of IncomeTaxExpenseBenefit | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.1 | 2.8 | 3.1 | 2.3 | 1.1 | 2.3 | 2.3 | 3.0 | 2.1 | 2.7 | 2.7 | 2.8 | 2.7 | 2.9 | 4.9 | 4.4 | 3.0 | 4.1 | 4.2 | 4.5 | 4.6 | 4.4 | 4.9 | 4.6 | 4.2 | 4.1 | 3.1 | 3.7 | 6.0 | 5.5 | 5.3 | 6.2 | -15.3 | 5.9 | 4.4 | 5.2 | 5.0 | 5.4 | 2.9 | 3.6 | 2.2 | -1.0 | -151.0 | -0.1 | -0.3 | 0.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | 41 | 42 | 46 | 49 | 45 | 43 | 44 | 40 | 37 | 37 | 36 | 37 | 37 | 35 | 35 | 36 | 40 | 41 | 41 | 42 | 43 | 44 | 44 | 35 |
| Percentage of InterestExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.2 | 3.5 | 3.8 | 4.2 | 4.3 | 3.7 | 3.8 | 3.5 | 3.3 | 3.3 | 3.3 | 3.5 | 3.5 | 3.4 | 3.6 | 3.7 | 4.2 | 4.3 | 4.4 | 4.6 | 4.7 | 4.9 | 5.1 | 4.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | 41 | 42 | 46 | 49 | 45 | 43 | 44 | 40 | 37 | 37 | 36 | 37 | 37 | 35 | 272 | -36.8 | -40.4 | -41.3 | 41 | 42 | -43.4 | -44.6 | 44 | 35 |
| Percentage of InterestExpenseDebt | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.2 | 3.5 | 3.8 | 4.2 | 4.3 | 3.7 | 3.8 | 3.5 | 3.3 | 3.3 | 3.3 | 3.5 | 3.5 | 3.4 | 27.1 | -3.7 | -4.2 | -4.3 | 4.4 | 4.6 | -4.7 | -4.9 | 5.1 | 4.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-06-30 | 2019-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 | 2015-09-30 |
| Value | 0.0 | 0.0 | 0.0 | 2.8 | 0.0 | 0.0 | 0.0 | 0.0 | -0.5 | 0.0 |
| Percentage of LitigationSettlementExpense | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-06-30 | 2019-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 | 2015-09-30 |
| Value | 0.0 | 0.0 | 0.0 | 2.8 | 0.0 | 0.0 | 0.0 | 0.0 | -0.5 | 0.0 |
| Percentage of LitigationSettlementExpense | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 28 | 88 | 91 | 83 | 60 | 65 | 63 | 66 | 65 | 61 | 62 | 58 | 47 | 50 | 42 | 42 | 42 | 50 | 83 | 46 | 48 | 58 | 165 | 51 | 47 | 47 | 46 | 44 | 50 | 57 | 21 | 79 | 779 | 31 | 47 | 40 |
| Percentage of NetIncomeLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.8 | 8.7 | 7.1 | 6.6 | 3.1 | 7.4 | 5.7 | 8.4 | 8.0 | 9.1 | 2.6 | 8.3 | 8.6 | 8.0 | 6.0 | 6.7 | 6.5 | 7.0 | 6.9 | 6.7 | 6.8 | 6.4 | 5.3 | 6.5 | 5.6 | 5.7 | 6.9 | 8.4 | 13.7 | 7.9 | 8.5 | 10.3 | 29.3 | 9.0 | 8.5 | 8.8 | 8.8 | 8.2 | 9.7 | 11.5 | 4.3 | 14.8 | 158.7 | 6.9 | 10.1 | 8.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 28 | 25 | 25 | 22 | 14 | 21 | 22 | 21 | 19 | 22 | 19 | 20 | 21 | 21 | 25 | 19 | 16 | 17 | 16 | 16 | 18 | 18 | 18 | 17 | 17 | 16 | 15 | 14 | 14 | 14 | 15 | 14 | 13 | 14 | 12 | 12 | 13 | 12 | 12 | 11 | 10 | 11 | 10 | 10 | 10 | 9.8 |
| Percentage of NetIncomeLossAttributableToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.2 | 2.1 | 2.1 | 1.9 | 1.4 | 1.8 | 1.9 | 1.9 | 1.7 | 2.0 | 1.8 | 1.9 | 2.0 | 2.0 | 2.6 | 2.0 | 1.7 | 1.8 | 1.8 | 1.8 | 2.0 | 2.1 | 2.1 | 2.2 | 2.3 | 2.2 | 2.5 | 2.5 | 2.4 | 2.5 | 2.7 | 2.5 | 2.4 | 2.5 | 2.2 | 2.4 | 2.5 | 2.3 | 2.4 | 2.3 | 2.1 | 2.2 | 2.2 | 2.2 | 2.2 | 2.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | 28 | 25 | -143.5 | 22 | 14 | 21 | -151.6 | 21 | 19 | 22 | 19 | 20 | 21 | 21 | 25 | 19 | 16 | 17 | 16 | 16 | 18 | 18 | 18 | 17 |
| Percentage of NetIncomeLossAttributableToNoncontrollingInterest | 100.0 | 100.0 | -558.4 | 100.0 | 100.0 | 100.0 | -670.8 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.2 | 2.1 | -11.8 | 1.9 | 1.4 | 1.8 | -12.8 | 1.9 | 1.7 | 2.0 | 1.8 | 1.9 | 2.0 | 2.0 | 2.6 | 2.0 | 1.7 | 1.8 | 1.8 | 1.8 | 2.0 | 2.1 | 2.1 | 2.2 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:MaterialReconcilingItems | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 0.5 | 0.4 | -2.2 | 0.3 | -0.3 | 0.9 | -17.7 | 2.7 | 2.8 | 2.7 | -14.9 | 2.0 | 2.5 | 1.9 | -11.5 | 2.5 | 1.0 | 1.1 |
| Percentage of NetIncomeLossAttributableToNoncontrollingInterest | 1.7 | 1.6 | -8.6 | 1.3 | -2.0 | 4.1 | -78.3 | 12.3 | 14.2 | 11.8 | -76.0 | 9.7 | 11.7 | 8.9 | -44.4 | 13.0 | 6.1 | 6.2 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | -0.2 | 0.0 | -0.0 | 0.1 | -1.5 | 0.2 | 0.2 | 0.2 | -1.4 | 0.2 | 0.2 | 0.2 | -1.1 | 0.3 | 0.1 | 0.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:HomeHealthandHospiceSegment | 0.2 | 0.1 | 0.0 | 0.1 | -0.1 | 0.3 | 0.0 | 0.9 | 1.1 | 1.1 | 0.0 | 0.8 | 1.1 | 0.9 | 0.0 | 1.3 | 0.5 | 0.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 28 | 25 | -141.3 | 22 | 15 | 20 | -143.2 | 20 | 19 | 21 | -136.5 | 19 | 19 | 20 | -116.2 | 16 | 15 | 16 |
| Percentage of NetIncomeLossAttributableToNoncontrollingInterest | 98.3 | 98.4 | -549.8 | 98.7 | 102.0 | 95.9 | -633.6 | 91.8 | 99.0 | 91.7 | -696.4 | 91.8 | 92.5 | 95.8 | -448.6 | 87.0 | 93.9 | 93.8 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.2 | 2.0 | -11.6 | 1.9 | 1.4 | 1.8 | -12.1 | 1.7 | 1.7 | 1.9 | -12.5 | 1.8 | 1.9 | 2.0 | -11.5 | 1.7 | 1.6 | 1.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:InpatientRehabilitationSegment | 2.8 | 2.6 | 0.0 | 2.5 | 1.8 | 2.3 | 0.0 | 2.3 | 2.2 | 2.4 | 0.0 | 2.3 | 2.4 | 2.4 | 0.0 | 2.1 | 2.0 | 2.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 28 | 88 | 91 | 83 | 60 | 65 | 71 | 69 | 67 | 64 | 65 | 60 | 49 | 53 | 45 | 44 | 44 | 52 | 85 | 48 | 49 | 58 | 165 | 51 | 47 | 47 | 46 | 44 |
| Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.8 | 8.7 | 7.1 | 6.6 | 3.1 | 7.4 | 5.7 | 8.4 | 8.0 | 9.1 | 2.6 | 8.3 | 8.6 | 8.0 | 6.0 | 6.7 | 7.4 | 7.2 | 7.1 | 6.9 | 7.1 | 6.6 | 5.6 | 6.8 | 5.9 | 6.0 | 7.2 | 8.8 | 14.1 | 8.3 | 8.7 | 10.3 | 29.3 | 9.0 | 8.5 | 8.8 | 8.8 | 8.2 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 |
| Value | 168 | 151 | 85 | 159 | 141 | 151 | 152 | 167 | 93 | 154 | 157 | 150 | 144 | 145 | 141 | 147 | 145 | 148 | 150 | 144 | 135 | 121 | 123 | 105 |
| Percentage of OperatingIncomeLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 13.9 | 12.9 | 7.9 | 13.5 | 11.9 | 13.0 | 13.4 | 14.9 | 8.5 | 14.5 | 14.7 | 14.3 | 14.3 | 14.8 | 14.6 | 15.4 | 15.3 | 16.0 | 16.3 | 15.8 | 15.4 | 15.6 | 16.1 | 14.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 4.6 | 1.4 | 4.2 | 2.5 | 5.8 | -1.9 | 3.6 | 21 | 2.2 | 3.7 | -0.7 | 1.7 | 1.3 | -0.1 | 1.2 | 1.0 | 0.9 | 1.0 | 0.8 | 0.8 | 0.7 | 0.6 | 1.3 | 0.7 | 3.0 | 0.5 | 1.1 | 0.2 | 28 | 1.7 | 1.3 | 0.6 | 1.9 | 0.7 | 1.1 | 6.1 | 0.4 | 0.9 | 1.2 | 0.2 | 0.7 | 0.6 | 1.8 | 0.7 | 1.4 | 0.7 |
| Percentage of OtherNonoperatingIncomeExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.1 | 0.3 | 0.2 | 0.5 | -0.2 | 0.3 | 1.8 | 0.2 | 0.3 | -0.1 | 0.2 | 0.1 | -0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.4 | 0.1 | 0.2 | 0.0 | 4.7 | 0.3 | 0.2 | 0.1 | 0.3 | 0.1 | 0.2 | 1.1 | 0.1 | 0.2 | 0.2 | 0.0 | 0.1 | 0.1 | 0.4 | 0.2 | 0.3 | 0.1 |
| Period End | 2021-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 1.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of OtherNonoperatingIncomeExpense | 34.8 | 0.0 | 0.0 | 0.0 | 0.0 | -0.0 | 0.0 | 38.5 | -0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:HomeHealthandHospiceSegment | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 2.3 | 1.5 | 4.1 | 2.1 | 3.4 | -1.6 | 4.0 | 1.8 | 1.9 | 2.8 | 0.1 | 1.8 | 1.2 | 0.5 | 1.2 | 1.0 | 0.9 | 1.0 |
| Percentage of OtherNonoperatingIncomeExpense | 50.0 | 107.1 | 97.6 | 84.0 | 58.6 | 84.2 | 111.1 | 8.6 | 86.4 | 75.7 | -14.3 | 105.9 | 92.3 | -500.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.2 | 0.1 | 0.3 | 0.2 | 0.3 | -0.1 | 0.3 | 0.2 | 0.2 | 0.2 | 0.0 | 0.2 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:InpatientRehabilitationSegment | 0.2 | 0.2 | 0.0 | 0.2 | 0.4 | -0.2 | 0.0 | 0.2 | 0.2 | 0.3 | 0.0 | 0.2 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 142 | 132 | 111 | 100 | 48 | 108 | 90 | 119 | 110 | 125 | 47 | 109 | 113 | 105 | 86 | 85 | 79 | 84 | 82 | 78 | 81 | 76 | 65 | 67 | 60 | 59 | 57 | 64 | 97 | 61 | 64 | 72 | 179 | 65 | 59 | 59 | 59 | 56 | 62 | 68 | 32 | 91 | 789 | 41 | 57 | 50 |
| Percentage of ProfitLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 11.0 | 10.8 | 9.2 | 8.5 | 4.5 | 9.2 | 7.6 | 10.3 | 9.8 | 11.1 | 4.4 | 10.2 | 10.6 | 10.1 | 8.6 | 8.7 | 8.2 | 8.8 | 8.6 | 8.4 | 8.8 | 8.4 | 7.5 | 8.7 | 7.9 | 8.0 | 9.4 | 10.9 | 16.2 | 10.4 | 11.2 | 12.8 | 31.7 | 11.5 | 10.7 | 11.2 | 11.2 | 10.5 | 12.1 | 13.7 | 6.4 | 17.0 | 160.9 | 9.1 | 12.3 | 10.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1287 | 1230 | 1214 | 1173 | 1074 | 1182 | 1184 | 1161 | 1135 | 1124 | 1096 | 1067 | 1067 | 1046 | 1008 | 981 | 966 | 957 | 949 | 926 | 920 | 909 | 879 | 778 | 764 | 740 | 613 | 596 | 604 | 591 | 572 | 564 | 564 | 572 | 552 | 537 | 533 | 538 | 518 | 497 | 505 | 538 | 490 | 460 | 467 | 491 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 131 | 126 | 108 | 99 | 102 | 97 | 94 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 10.2 | 10.3 | 9.2 | 9.3 | 8.7 | 8.4 | 8.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 10.2 | 10.3 | 9.2 | 9.3 | 8.7 | 8.4 | 8.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:ManagedCare | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 46 | 42 | 41 | 38 | 34 | 32 | 31 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.6 | 3.5 | 3.6 | 3.6 | 3.0 | 2.8 | 2.8 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.6 | 3.5 | 3.6 | 3.6 | 3.0 | 2.8 | 2.8 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Medicaid | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 885 | 838 | 821 | 707 | 868 | 872 | 850 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 68.8 | 68.1 | 69.9 | 65.8 | 73.4 | 75.1 | 74.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 68.8 | 68.1 | 69.9 | 65.8 | 73.4 | 75.1 | 74.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Medicare | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 183 | 186 | 170 | 195 | 140 | 119 | 123 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 14.3 | 15.1 | 14.5 | 18.2 | 11.9 | 10.3 | 10.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 14.3 | 15.1 | 14.5 | 18.2 | 11.9 | 10.3 | 10.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:MedicareAdvantage | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 20 | 13 | 11 | 14 | 11 | 12 | 12 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.6 | 1.1 | 1.0 | 1.4 | 1.0 | 1.1 | 1.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.6 | 1.1 | 1.0 | 1.4 | 1.0 | 1.1 | 1.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:OtherIncomeSource | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 11 | 12 | 10 | 9.3 | 11 | 12 | 10 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.9 | 1.0 | 0.9 | 0.9 | 0.9 | 1.0 | 0.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.9 | 1.0 | 0.9 | 0.9 | 0.9 | 1.0 | 0.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:OtherThirdpartyPayors | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 4.6 | 5.1 | 5.3 | 4.4 | 5.9 | 6.1 | 5.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.4 | 0.5 | 0.4 | 0.5 | 0.5 | 0.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.4 | 0.5 | 0.4 | 0.5 | 0.5 | 0.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Patients | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 5.2 | 5.8 | 4.9 | 4.5 | 7.2 | 7.2 | 6.8 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.5 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.5 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:WorkersCompensation | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 16 | 14 | 12 | 11 | 12 | 10 | 8.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.3 | 1.2 | 1.1 | 1.1 | 1.0 | 0.9 | 0.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.3 | 1.2 | 1.1 | 1.1 | 1.0 | 0.9 | 0.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:ManagedCare ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 114 | 112 | 95 | 88 | 90 | 87 | 86 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.9 | 9.1 | 8.2 | 8.2 | 7.6 | 7.5 | 7.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.9 | 9.1 | 8.2 | 8.2 | 7.6 | 7.5 | 7.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:ManagedCare ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 4.2 | 3.8 | 3.3 | 4.1 | 4.2 | 4.8 | 4.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.3 | 0.3 | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.3 | 0.3 | 0.3 | 0.4 | 0.4 | 0.4 | 0.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Medicaid ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 41 | 39 | 38 | 34 | 30 | 28 | 27 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.2 | 3.2 | 3.3 | 3.2 | 2.6 | 2.4 | 2.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 3.2 | 3.2 | 3.3 | 3.2 | 2.6 | 2.4 | 2.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Medicaid ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 234 | 223 | 228 | 204 | 226 | 248 | 221 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 18.2 | 18.2 | 19.5 | 19.0 | 19.1 | 21.4 | 19.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 18.2 | 18.2 | 19.5 | 19.0 | 19.1 | 21.4 | 19.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Medicare ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 650 | 614 | 592 | 502 | 641 | 624 | 629 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 50.5 | 49.9 | 50.5 | 46.8 | 54.3 | 53.8 | 55.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 50.5 | 49.9 | 50.5 | 46.8 | 54.3 | 53.8 | 55.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Medicare ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 29 | 28 | 29 | 29 | 29 | 25 | 26 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.3 | 2.3 | 2.5 | 2.7 | 2.5 | 2.2 | 2.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 2.3 | 2.3 | 2.5 | 2.7 | 2.5 | 2.2 | 2.4 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:MedicareAdvantage ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 153 | 158 | 141 | 166 | 111 | 94 | 97 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 11.9 | 12.9 | 12.0 | 15.5 | 9.4 | 8.2 | 8.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 11.9 | 12.9 | 12.0 | 15.5 | 9.4 | 8.2 | 8.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:MedicareAdvantage ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 0.2 | 0.2 | 0.1 | 0.2 | 0.2 | 0.2 | 0.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:OtherIncomeSource ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 20 | 13 | 11 | 14 | 11 | 12 | 11 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.6 | 1.1 | 0.9 | 1.4 | 1.0 | 1.1 | 1.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.6 | 1.1 | 0.9 | 1.4 | 1.0 | 1.1 | 1.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:OtherIncomeSource ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 11 | 12 | 10 | 9.3 | 11 | 12 | 10 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.9 | 1.0 | 0.9 | 0.9 | 0.9 | 1.0 | 0.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.9 | 1.0 | 0.9 | 0.9 | 0.9 | 1.0 | 0.9 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:OtherThirdpartyPayors ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 0.3 | 0.2 | 0.2 | 0.2 | 0.4 | 0.0 | 0.1 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Patients ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 4.3 | 4.9 | 5.1 | 4.2 | 5.5 | 6.1 | 5.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.3 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.3 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:Patients ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 0.0 | 0.1 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:WorkersCompensation ehc:HomeHealthandHospiceSegment | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 5.2 | 5.7 | 4.6 | 4.2 | 6.9 | 6.9 | 6.5 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.5 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.4 | 0.5 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:WorkersCompensation ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 286 | 270 | 281 | 274 | 249 | 272 | 287 | 289 | 261 | 253 | 250 | 242 | 233 | 205 | 206 | 198 | 188 | 179 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 22.2 | 22.0 | 23.2 | 23.4 | 23.2 | 23.1 | 24.3 | 24.9 | 23.0 | 22.6 | 22.8 | 22.7 | 21.8 | 19.7 | 20.5 | 20.2 | 19.5 | 18.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 22.2 | 22.0 | 23.2 | 23.4 | 23.2 | 23.1 | 24.3 | 24.9 | 23.0 | 22.6 | 22.8 | 22.7 | 21.8 | 19.7 | 20.5 | 20.2 | 19.5 | 18.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 1001 | 959 | 933 | 899 | 824 | 909 | 896 | 872 | 873 | 870 | 845 | 825 | 834 | 840 | 802 | 783 | 777 | 777 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 77.8 | 78.0 | 76.8 | 76.6 | 76.8 | 76.9 | 75.7 | 75.1 | 77.0 | 77.4 | 77.2 | 77.3 | 78.2 | 80.3 | 79.5 | 79.8 | 80.5 | 81.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 77.8 | 78.0 | 76.8 | 76.6 | 76.8 | 76.9 | 75.7 | 75.1 | 77.0 | 77.4 | 77.2 | 77.3 | 78.2 | 80.3 | 79.5 | 79.8 | 80.5 | 81.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 |
| Value | 232 | 219 | 227 | 223 | 201 | 224 | 236 | 238 | 222 | 219 | 215 | 209 | 204 | 185 | 186 | 180 | 171 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 18.0 | 17.9 | 18.8 | 19.0 | 18.8 | 19.0 | 20.0 | 20.6 | 19.6 | 19.5 | 19.6 | 19.6 | 19.2 | 17.7 | 18.5 | 18.4 | 17.8 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 18.0 | 17.9 | 18.8 | 19.0 | 18.8 | 19.0 | 20.0 | 20.6 | 19.6 | 19.5 | 19.6 | 19.6 | 19.2 | 17.7 | 18.5 | 18.4 | 17.8 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:HomeHealthandHospiceSegment ehc:Homehealth | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 |
| Value | 53 | 50 | 53 | 51 | 47 | 48 | 50 | 50 | 38 | 34 | 35 | 32 | 28 | 20 | 20 | 17 | 16 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 4.2 | 4.1 | 4.4 | 4.4 | 4.5 | 4.1 | 4.3 | 4.3 | 3.4 | 3.1 | 3.2 | 3.1 | 2.7 | 2.0 | 2.0 | 1.8 | 1.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 4.2 | 4.1 | 4.4 | 4.4 | 4.5 | 4.1 | 4.3 | 4.3 | 3.4 | 3.1 | 3.2 | 3.1 | 2.7 | 2.0 | 2.0 | 1.8 | 1.7 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:HomeHealthandHospiceSegment ehc:Hospice | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 976 | 942 | 914 | 883 | 808 | 890 | 873 | 850 | 851 | 847 | 822 | 798 | 809 | 817 | 776 | 758 | 751 | 752 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 75.9 | 76.6 | 75.3 | 75.2 | 75.2 | 75.3 | 73.8 | 73.2 | 75.0 | 75.4 | 75.1 | 74.8 | 75.8 | 78.1 | 77.0 | 77.2 | 77.8 | 78.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 75.9 | 76.6 | 75.3 | 75.2 | 75.2 | 75.3 | 73.8 | 73.2 | 75.0 | 75.4 | 75.1 | 74.8 | 75.8 | 78.1 | 77.0 | 77.2 | 77.8 | 78.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:InpatientRehabilitationSegment ehc:Inpatient | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 24 | 17 | 18 | 16 | 16 | 19 | 23 | 21 | 22 | 22 | 22 | 27 | 25 | 23 | 25 | 25 | 26 | 25 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.9 | 1.4 | 1.5 | 1.4 | 1.5 | 1.6 | 2.0 | 1.9 | 1.9 | 2.0 | 2.1 | 2.5 | 2.3 | 2.2 | 2.5 | 2.6 | 2.7 | 2.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.9 | 1.4 | 1.5 | 1.4 | 1.5 | 1.6 | 2.0 | 1.9 | 1.9 | 2.0 | 2.1 | 2.5 | 2.3 | 2.2 | 2.5 | 2.6 | 2.7 | 2.6 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax ehc:InpatientRehabilitationSegment ehc:Outpatientandother | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1287 | 1230 | 1214 | 1173 | 1074 | 1182 | 1184 | 1161 | 1135 | 1124 | 1096 | 1067 | 1067 | 1046 | 1008 | 981 | 966 | 957 | 949 | 926 | 920 | 909 | 879 | 778 | 764 | 740 | 613 | 596 | 604 | 591 | 572 | 564 | 564 | 572 | 552 | 537 | 533 | 538 | 518 | 497 | 505 | 538 | 490 | 460 | 467 | 491 |
| Percentage of Revenues | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 6612 | 6542 | 6445 | 6610 | 6502 | 6137 | 6080 | 6386 | 5812 | 5583 | 5175 | 5131 | 5089 | 4939 | 4893 | 4883 | 4840 | 4703 | 4681 | 4631 | 4632 | 4608 | 4606 | 4249 | 3469 | 3577 | 3408 | 2794 | 2576 | 2539 | 2534 | 2556 | 2511 | 2392 | 2423 | 2456 | 2315 | 2295 | 2271 | 2271 | 2377 | 2481 | 2372 | 1681 |
| Percentage of Assets | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 230 | 219 | 221 | 222 | 221 | 222 | 215 |
| Percentage of Assets | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | 3.6 | 3.5 |
| Percentage of Assets | 3.5 | 3.4 | 3.4 | 3.4 | 3.4 | 3.6 | 3.5 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 6445 | 6670 | 6562 | 6198 | 6114 | 6420 | 5845 | 5617 | 5215 | 5172 | 5129 | 4980 | 4939 | 4953 | 4910 | 4774 | 4753 | 4702 | 4677 |
| Percentage of Assets | 100.0 | 100.9 | 100.9 | 101.0 | 100.6 | 100.5 | 100.6 | 100.6 | 100.8 | 100.8 | 100.8 | 100.8 | 100.9 | 101.4 | 101.5 | 101.5 | 101.5 | 101.5 | 101.5 |
| Percentage of Assets | 100.0 | 100.9 | 100.9 | 101.0 | 100.6 | 100.5 | 100.6 | 100.6 | 100.8 | 100.8 | 100.8 | 100.8 | 100.9 | 101.4 | 101.5 | 101.5 | 101.5 | 101.5 | 101.5 |
| Percentage of Assets us-gaap:OperatingSegments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 10 | 13 |
| Percentage of Assets | 0.2 | 0.2 |
| Percentage of Assets | 0.2 | 0.2 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 1611 | 1611 | 1612 | 1623 | 1388 | 1366 | 1314 | 1297 | 1311 | 1152 | 1150 | 1123 |
| Percentage of Assets | 25.0 | 24.4 | 26.5 | 25.4 | 23.9 | 24.5 | 25.4 | 25.3 | 25.8 | 23.3 | 23.5 | 24.0 |
| Percentage of Assets | 25.0 | 24.4 | 26.5 | 25.4 | 23.9 | 24.5 | 25.4 | 25.3 | 25.8 | 23.3 | 23.5 | 24.0 |
| Percentage of Assets ehc:HomeHealthandHospiceSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 4834 | 5058 | 4501 | 4796 | 4457 | 4250 | 3900 | 3875 | 3818 | 3827 | 3789 | 3629 |
| Percentage of Assets | 75.0 | 76.5 | 74.0 | 75.1 | 76.7 | 76.1 | 75.4 | 75.5 | 75.0 | 77.5 | 77.4 | 77.5 |
| Percentage of Assets | 75.0 | 76.5 | 74.0 | 75.1 | 76.7 | 76.1 | 75.4 | 75.5 | 75.0 | 77.5 | 77.4 | 77.5 |
| Percentage of Assets ehc:InpatientRehabilitationSegment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 4403 | 4467 | 4444 | 4680 | 4637 | 4306 | 4148 | 4505 | 3875 | 3694 | 3356 | 3311 | 3364 | 3300 | 3248 | 3288 | 3301 | 3571 | 3614 | 3608 | 3663 | 3688 | 3705 | 3345 | 2606 | 2759 | 2611 | 2095 | 1915 | 1950 | 1959 | 1758 | 1762 | 1812 | 1677 | 1758 | 1679 | 1696 | 1682 | 1731 | 1893 | 2021 | 1986 | 2191 |
| Percentage of Liabilities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 66.6 | 68.3 | 68.9 | 70.8 | 71.3 | 70.2 | 68.2 | 70.5 | 66.7 | 66.2 | 64.9 | 64.5 | 66.1 | 66.8 | 66.4 | 67.3 | 68.2 | 75.9 | 77.2 | 77.9 | 79.1 | 80.0 | 80.5 | 78.7 | 75.1 | 77.1 | 76.6 | 75.0 | 74.3 | 76.8 | 77.3 | 68.8 | 70.2 | 75.8 | 69.2 | 71.6 | 72.5 | 73.9 | 74.1 | 76.3 | 79.6 | 81.5 | 83.8 | 130.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 47 | 44 | 46 | 44 | 42 | 39 | 41 |
| Percentage of Liabilities | 1.1 | 1.0 | 1.1 | 1.0 | 0.9 | 0.9 | 1.0 |
| Percentage of Assets | 0.7 | 0.7 | 0.7 | 0.7 | 0.6 | 0.6 | 0.7 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 20.4 | 20.3 | 21.2 | 20.1 | 19.0 | 17.7 | 19.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 6612 | 6542 | 6445 | 6610 | 6502 | 6137 | 6080 | 6386 | 5812 | 5583 | 5175 | 5131 | 5089 | 4939 | 4893 | 4883 | 4840 | 4703 | 4681 | 4631 | 4632 | 4608 | 4606 | 4249 | 3469 | 3577 | 3408 | 2794 | 2576 | 2539 | 2534 | 2556 | 2511 | 2392 | 2423 | 2456 | 2315 | 2295 | 2271 | 2271 | 2377 | 2481 | 2372 | 1681 |
| Percentage of LiabilitiesAndStockholdersEquity | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 10 | 13 |
| Percentage of LiabilitiesAndStockholdersEquity | 0.2 | 0.2 |
| Percentage of Assets | 0.2 | 0.2 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | 2009-12-31 | 2008-12-31 | 2007-12-31 |
| Value | 1762 | 1655 | 1588 | 1520 | 1462 | 1443 | 1352 | 1333 | 1275 | 1314 | 1276 | 1318 | 1254 | 1197 | 1181 | 1136 | 1103 | 779 | 735 | 726 | 672 | 649 | 611 | 630 | 605 | 492 | 473 | 449 | 413 | 355 | 344 | 321 | 274 | 108 | 291 | 244 | 195 | 149 | 117 | 151 | 96 | 72 | -2.2 | -782.3 | -817.3 | -861.9 | -897.6 | -1087.2 | -1457.3 |
| Percentage of StockholdersEquity | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 26.6 | 25.3 | 24.6 | 23.0 | 22.5 | 23.5 | 22.2 | 20.9 | 22.0 | 23.5 | 24.7 | 25.7 | 24.7 | 24.2 | 24.1 | 23.3 | 22.8 | 16.6 | 15.7 | 15.7 | 14.5 | 14.1 | 13.3 | 14.8 | 17.5 | 13.8 | 13.9 | 16.1 | 16.1 | 14.0 | 13.6 | 12.6 | 10.9 | 4.5 | 12.0 | 10.0 | 8.5 | 6.5 | 5.2 | 6.7 | 4.1 | 2.9 | -0.1 | 0.0 | 0.0 | 0.0 | -53.4 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3.5 | 4.9 |
| Percentage of StockholdersEquity | 0.2 | 0.4 |
| Percentage of Assets | 0.1 | 0.1 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 33.0 | 36.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 859 | 1001 | 948 | 1174 | 1101 | 784 | 755 | 1077 | 844 | 682 | 662 | 638 | 671 | 708 | 702 | 687 | 693 | 682 | 654 | 666 | 659 | 632 | 598 | 1463 | 712 | 866 | 686 | 783 | 580 | 585 | 580 | 575 | 591 | 597 | 636 | 548 | 424 | 431 | 391 | 410 | 428 | 521 | 406 | 426 |
| Percentage of AssetsCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 13.0 | 15.3 | 14.7 | 17.8 | 16.9 | 12.8 | 12.4 | 16.9 | 14.5 | 12.2 | 12.8 | 12.4 | 13.2 | 14.3 | 14.3 | 14.1 | 14.3 | 14.5 | 14.0 | 14.4 | 14.2 | 13.7 | 13.0 | 34.4 | 20.5 | 24.2 | 20.1 | 28.0 | 22.5 | 23.0 | 22.9 | 22.5 | 23.5 | 25.0 | 26.3 | 22.3 | 18.3 | 18.8 | 17.2 | 18.1 | 18.0 | 21.0 | 17.1 | 25.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 44 | 42 | 41 | 41 | 40 | 40 | 35 |
| Percentage of AssetsCurrent | 5.2 | 4.3 | 4.4 | 3.5 | 3.7 | 5.1 | 4.7 |
| Percentage of Assets | 0.7 | 0.7 | 0.6 | 0.6 | 0.6 | 0.7 | 0.6 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 19.5 | 19.5 | 18.9 | 18.5 | 18.4 | 18.0 | 16.7 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 2.9 | 4.2 |
| Percentage of AssetsCurrent | 0.3 | 0.6 |
| Percentage of Assets | 0.0 | 0.1 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 27.4 | 31.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2009-12-31 | 2008-12-31 |
| Value | 73 | 223 | 224 | 450 | 419 | 104 | 94 | 422 | 221 | 56 | 69 | 56 | 59 | 86 | 54 | 67 | 71 | 61 | 40 | 76 | 70 | 73 | 61 | 801 | 45 | 208 | 66 | 272 | 65 | 53 | 64 | 65 | 68 | 80 | 132 | 163 | 41 | 44 | 30 | 47 | 60 | 140 | 48 | 190 | 172 | 80 | 31 |
| Percentage of CashAndCashEquivalentsAtCarryingValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 1.1 | 3.4 | 3.5 | 6.8 | 6.4 | 1.7 | 1.6 | 6.6 | 3.8 | 1.0 | 1.3 | 1.1 | 1.2 | 1.7 | 1.1 | 1.4 | 1.5 | 1.3 | 0.9 | 1.6 | 1.5 | 1.6 | 1.3 | 18.9 | 1.3 | 5.8 | 2.0 | 9.7 | 2.6 | 2.1 | 2.5 | 2.5 | 2.7 | 3.3 | 5.5 | 6.6 | 1.8 | 1.9 | 1.3 | 2.1 | 2.5 | 5.7 | 2.0 | 0.0 | 0.0 | 4.8 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 0.8 | 0.5 | 0.1 | 0.5 | 1.1 | 0.2 |
| Percentage of CashAndCashEquivalentsAtCarryingValue | 1.1 | 0.2 | 0.0 | 0.1 | 1.0 | 0.2 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 0.3 | 0.2 | 0.0 | 0.2 | 0.5 | 0.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 224 | 94 | 69 | 54 | 40 | 61 | 66 | 64 | 132 | 30 | 48 |
| Percentage of CashAndCashEquivalentsAtCarryingValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 3.5 | 1.6 | 1.3 | 1.1 | 0.9 | 1.3 | 2.0 | 2.5 | 5.5 | 1.3 | 2.0 |
| Percentage of Assets us-gaap:Cash | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2015-12-31 |
| Value | 139 | 296 | 310 | 528 | 490 | 177 | 159 | 513 | 287 | 120 | 133 | 121 | 124 | 155 | 116 | 138 | 144 | 126 | 101 | 107 |
| Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 2.1 | 4.5 | 4.8 | 8.0 | 7.5 | 2.9 | 2.6 | 8.0 | 5.0 | 2.2 | 2.6 | 2.4 | 2.5 | 3.2 | 2.4 | 2.8 | 3.0 | 2.7 | 2.2 | 2.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 627 | 633 | 563 | 593 | 553 | 543 | 498 | 516 | 496 | 500 | 459 | 458 | 456 | 463 | 459 | 441 | 426 | 438 | 432 | 419 | 420 | 431 | 410 | 350 | 351 | 337 | 323 | 261 | 272 | 272 | 261 | 253 | 273 | 266 | 249 | 247 | 245 | 244 | 222 | 219 | 212 | 240 | 224 | 219 |
| Percentage of AccountsReceivableNetCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 9.5 | 9.7 | 8.7 | 9.0 | 8.5 | 8.9 | 8.2 | 8.1 | 8.5 | 9.0 | 8.9 | 8.9 | 9.0 | 9.4 | 9.4 | 9.0 | 8.8 | 9.3 | 9.2 | 9.1 | 9.1 | 9.4 | 8.9 | 8.3 | 10.1 | 9.4 | 9.5 | 9.4 | 10.6 | 10.7 | 10.3 | 9.9 | 10.9 | 11.1 | 10.3 | 10.1 | 10.6 | 10.6 | 9.8 | 9.7 | 9.0 | 9.7 | 9.5 | 13.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 34 | 33 | 33 | 33 | 33 | 31 | 29 |
| Percentage of AccountsReceivableNetCurrent | 5.4 | 5.3 | 5.9 | 5.7 | 6.0 | 5.8 | 5.9 |
| Percentage of Assets | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 14.8 | 15.4 | 15.0 | 15.1 | 14.9 | 14.1 | 13.6 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 |
| Value | 572 | 506 | 467 | 472 | 443 | 410 |
| Percentage of ReceivablesNetCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 8.9 | 8.3 | 9.0 | 9.6 | 9.5 | 8.9 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 33 | 29 |
| Percentage of ReceivablesNetCurrent | 5.8 | 5.8 |
| Percentage of Assets | 0.5 | 0.5 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 15.0 | 13.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 |
| Value | 93 | 81 | 86 | 73 | 73 | 79 | 97 | 71 | 70 | 67 | 66 | 61 | 90 | 89 | 113 | 178 | 195 | 183 | 170 | 170 | 168 | 127 | 126 | 124 | 126 | 131 | 108 | 110 | 103 | 120 | 115 | 119 | 111 | 113 | 117 | 138 | 137 | 142 | 138 | 143 | 155 | 139 | 132 |
| Percentage of OtherAssetsCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 1.4 | 1.2 | 1.3 | 1.1 | 1.1 | 1.3 | 1.6 | 1.1 | 1.2 | 1.2 | 1.3 | 1.2 | 1.8 | 1.8 | 2.3 | 3.6 | 4.0 | 3.9 | 3.6 | 3.7 | 3.6 | 2.8 | 2.7 | 2.9 | 3.7 | 3.7 | 3.2 | 3.9 | 4.0 | 4.7 | 4.5 | 4.7 | 4.4 | 4.7 | 4.8 | 5.6 | 5.9 | 6.2 | 6.1 | 6.3 | 6.5 | 5.6 | 5.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 10.0 | 8.5 | 8.6 | 7.5 | 7.2 | 7.7 | 6.4 |
| Percentage of OtherAssetsCurrent | 10.7 | 10.4 | 10.0 | 10.1 | 9.8 | 9.7 | 6.6 |
| Percentage of Assets | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 4.3 | 3.9 | 3.9 | 3.4 | 3.3 | 3.5 | 3.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 86 | 97 | 66 | 113 | 109 | 80 | 62 | 62 | 67 | 61 | 68 |
| Percentage of PrepaidExpenseAndOtherAssetsCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 1.3 | 1.6 | 1.3 | 2.3 | 2.3 | 1.8 | 1.8 | 2.5 | 2.8 | 2.7 | 2.9 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 7700000.0 | 9300000.0 |
| Percentage of AssetsNoncurrent | 100.0 | 100.0 |
| Percentage of Assets | 0.1 | 0.2 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 72.6 | 68.9 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 2094 | 2041 | 2003 | 1959 | 1874 | 1788 | 1736 | 1634 | 1591 | 1565 | 1554 | 1517 | 1482 | 1452 | 1406 | 1391 | 1353 | 1336 | 1317 | 1310 | 1079 | 1062 | 1012 | 1019 | 994 | 976 | 930 | 910 | 893 | 793 | 764 | 748 | 739 | 718 | 677 | 664 | 648 | 642 | 682 | 685 | 664 |
| Percentage of PropertyPlantAndEquipmentNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 31.7 | 31.4 | 32.6 | 32.2 | 29.4 | 30.8 | 31.1 | 31.6 | 31.0 | 30.8 | 31.5 | 31.0 | 30.4 | 30.0 | 29.9 | 29.7 | 29.2 | 28.9 | 28.6 | 28.4 | 25.4 | 30.6 | 28.3 | 29.9 | 35.6 | 37.9 | 36.7 | 35.9 | 35.0 | 31.6 | 31.9 | 30.9 | 30.1 | 31.0 | 29.5 | 29.3 | 28.6 | 27.0 | 27.5 | 28.9 | 39.5 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 121 | 120 | 120 | 122 |
| Percentage of PropertyPlantAndEquipmentNet | 5.8 | 5.9 | 6.0 | 6.3 |
| Percentage of Assets | 1.8 | 1.9 | 2.0 | 2.0 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 54.9 | 54.5 | 54.4 | 57.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2010-12-31 | 2009-12-31 |
| Value | 5.5 | 5.6 | 5.4 | 5.7 | 7.4 | 8.0 | 13 | 12 | 12 | 12 | 12 | 13 | 11 | 12 | 12 | 12 | 13 | 13 | 13 | 12 | 11 | 11 | 9.5 | 9.1 | 9.4 | 10 | 11 | 20 | 20 | 19 | 21 | 20 | 20 | 20 | 29 | 29 | 29 | 29 | 30 | 30 | 29 |
| Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.4 | 0.4 | 0.8 | 0.8 | 0.7 | 0.9 | 0.8 | 0.9 | 0.9 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.3 | 1.7 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 4.0 | 3.9 | 5.4 | 5.3 | 5.3 | 3.1 | 2.7 | 2.9 | 2.8 | 2.8 | 2.6 | 2.4 |
| Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 72.7 | 69.6 | 73.0 | 66.2 | 38.1 | 24.8 | 22.1 | 22.8 | 22.2 | 21.5 | 21.8 | 18.5 |
| Percentage of Assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets ehc:HomeHealthandHospiceSegment | 0.2 | 0.2 | 0.3 | 0.3 | 0.4 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 1.5 | 1.7 | 2.0 | 2.7 | 8.6 | 9.4 | 9.5 | 9.8 | 9.8 | 10 | 9.3 | 10 |
| Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | 27.3 | 30.4 | 27.0 | 33.8 | 61.9 | 75.2 | 77.9 | 77.2 | 77.8 | 78.5 | 78.2 | 81.5 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Percentage of Assets ehc:InpatientRehabilitationSegment | 0.0 | 0.0 | 0.0 | 0.1 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.2 | 0.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-30 | 2014-09-30 | 2014-06-29 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-04-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | 2412 | 2318 | 2318 | 2318 | 2318 | 2312 | 2305 | 2305 | 2111 | 2111 | 2100 | 2081 | 2074 | 1973 | 1972 | 1971 | 1949 | 1931 | 1927 | 1915 | 1899 | 1891 | 1890 | 1105 | 1097 | 1090 | 34 | 491 | 34 | 456 | 456 | 457 | 457 | 13 | 443 | 437 | 437 | 421 | 421 | 421 | 420 | 420 | 431 | 431 | 418 | 406 |
| Percentage of Goodwill | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 36.5 | 35.4 | 36.0 | 35.1 | 35.7 | 37.7 | 37.9 | 36.1 | 36.3 | 37.8 | 40.6 | 40.6 | 40.8 | 39.9 | 40.3 | 40.4 | 40.3 | 41.1 | 41.2 | 41.4 | 41.0 | 41.1 | 41.0 | 26.0 | 31.6 | 30.5 | 0.0 | 17.6 | 0.0 | 18.0 | 18.0 | 17.9 | 18.2 | 0.0 | 18.5 | 18.0 | 17.8 | 18.2 | 18.4 | 18.6 | 18.5 | 17.7 | 17.4 | 18.2 | 24.9 | 0.0 |
| Period End | 2021-06-01 |
| Value | 90 |
| Percentage of Goodwill | 0.0 |
| Percentage of Assets | 0.0 |
| Percentage of Assets ehc:FrontierHomeHealthAndHospice ehc:HomeHealthandHospiceSegment | 0.0 |
| Period End | 2021-06-30 |
| Value | 3.5 |
| Percentage of Goodwill | 0.1 |
| Percentage of Assets | 0.1 |
| Percentage of Assets ehc:ShannonMedicalAndHeritageValleyHealthSystem ehc:InpatientRehabilitationSegment | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 29 | 19 | 19 | 19 | 19 | 19 | 15 |
| Percentage of Goodwill | 1.2 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.7 |
| Percentage of Assets | 0.4 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 12.7 | 8.8 | 8.7 | 8.6 | 8.7 | 8.6 | 7.4 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 |
| Value | 1090 | 1086 | 911 | 806 | 785 | 757 | 592 |
| Percentage of Goodwill | 47.0 | 47.1 | 43.4 | 40.9 | 40.7 | 40.1 | 0.0 |
| Percentage of Assets | 16.9 | 17.9 | 17.6 | 16.5 | 16.8 | 16.4 | 17.4 |
| Percentage of Assets ehc:HomeHealthandHospiceSegment | 67.7 | 67.4 | 69.3 | 70.1 | 69.9 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 |
| Value | 1228 | 1218 | 1189 | 1166 | 1142 | 1133 | 491 |
| Percentage of Goodwill | 53.0 | 52.9 | 56.6 | 59.1 | 59.3 | 59.9 | 0.0 |
| Percentage of Assets | 19.1 | 20.0 | 23.0 | 23.8 | 24.4 | 24.6 | 14.4 |
| Percentage of Assets ehc:InpatientRehabilitationSegment | 25.4 | 27.1 | 30.5 | 30.8 | 31.5 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 435 | 419 | 431 | 441 | 455 | 464 | 476 | 486 | 443 | 435 | 443 | 443 | 443 | 396 | 403 | 405 | 404 | 404 | 411 | 410 | 414 | 415 | 419 | 324 | 325 | 307 | 306 | 99 | 103 | 89 | 88 | 87 | 86 | 82 | 73 | 73 | 69 | 61 | 57 | 42 | 45 | 46 | 48 | 43 |
| Percentage of IntangibleAssetsNetExcludingGoodwill | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 6.6 | 6.4 | 6.7 | 6.7 | 7.0 | 7.6 | 7.8 | 7.6 | 7.6 | 7.8 | 8.6 | 8.6 | 8.7 | 8.0 | 8.2 | 8.3 | 8.4 | 8.6 | 8.8 | 8.9 | 8.9 | 9.0 | 9.1 | 7.6 | 9.4 | 8.6 | 9.0 | 3.6 | 4.0 | 3.5 | 3.5 | 3.4 | 3.5 | 3.5 | 3.0 | 3.0 | 3.0 | 2.7 | 2.5 | 1.9 | 1.9 | 1.9 | 2.1 | 2.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 3.6 | 3.1 | 3.3 | 3.7 | 4.1 | 4.8 | 3.3 |
| Percentage of IntangibleAssetsNetExcludingGoodwill | 0.8 | 0.7 | 0.8 | 0.8 | 0.9 | 1.0 | 0.7 |
| Percentage of Assets | 0.1 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 1.6 | 1.4 | 1.5 | 1.7 | 1.9 | 2.2 | 1.5 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 431 | 476 | 443 | 403 | 411 | 419 | 306 | 88 | 73 | 57 | 58 |
| Percentage of FiniteLivedIntangibleAssetsNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 6.7 | 7.8 | 8.6 | 8.2 | 8.8 | 9.1 | 9.0 | 3.5 | 3.0 | 2.5 | 2.5 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 142 | 156 | 120 | 94 | 85 |
| Percentage of FiniteLivedIntangibleAssetsNet | 33.1 | 32.9 | 27.1 | 23.4 | 20.8 |
| Percentage of Assets | 2.2 | 2.6 | 2.3 | 1.9 | 1.8 |
| Percentage of Assets ehc:CertificateOfNeed | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 1.8 | 2.2 | 2.7 | 3.2 | 3.7 |
| Percentage of FiniteLivedIntangibleAssetsNet | 0.4 | 0.5 | 0.6 | 0.8 | 0.9 |
| Percentage of Assets | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets ehc:MarketAccessAssets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 |
| Value | 42 | 57 | 72 | 69 | 71 | 65 | 50 | 41 | 29 |
| Percentage of FiniteLivedIntangibleAssetsNet | 9.9 | 12.1 | 16.2 | 17.2 | 17.3 | 15.5 | 16.6 | 47.4 | 40.6 |
| Percentage of Assets | 0.7 | 1.0 | 1.4 | 1.4 | 1.5 | 1.4 | 1.5 | 1.6 | 1.2 |
| Percentage of Assets us-gaap:ComputerSoftwareIntangibleAsset | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 80 | 93 | 86 | 74 | 79 | 85 | 64 | 5.6 | 7.7 | 8.5 | 10 |
| Percentage of FiniteLivedIntangibleAssetsNet | 18.7 | 19.6 | 19.6 | 18.5 | 19.4 | 20.3 | 21.1 | 6.3 | 10.5 | 14.7 | 18.5 |
| Percentage of Assets | 1.2 | 1.5 | 1.7 | 1.5 | 1.7 | 1.8 | 1.9 | 0.2 | 0.3 | 0.4 | 0.5 |
| Percentage of Assets us-gaap:LicensingAgreements | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 9.4 | 11 | 7.0 | 8.1 | 14 | 21 | 16 | 15 | 14 | 15 | 17 |
| Percentage of FiniteLivedIntangibleAssetsNet | 2.2 | 2.5 | 1.6 | 2.0 | 3.6 | 5.0 | 5.5 | 17.5 | 19.1 | 27.6 | 30.3 |
| Percentage of Assets | 0.1 | 0.2 | 0.1 | 0.2 | 0.3 | 0.5 | 0.5 | 0.6 | 0.6 | 0.7 | 0.7 |
| Percentage of Assets us-gaap:NoncompeteAgreements | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 18 | 19 | 19 | 18 | 20 | 21 | 9.8 | 7.7 | 7.5 | 7.0 | 7.0 |
| Percentage of FiniteLivedIntangibleAssetsNet | 4.4 | 4.0 | 4.4 | 4.6 | 5.0 | 5.1 | 3.2 | 8.7 | 10.2 | 12.1 | 12.0 |
| Percentage of Assets | 0.3 | 0.3 | 0.4 | 0.4 | 0.4 | 0.5 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Percentage of Assets us-gaap:TradeNames | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 244 | 248 | 245 | 267 | 268 | 267 | 276 | 311 | 284 | 284 | 0.0 |
| Percentage of OperatingLeaseRightOfUseAsset | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Percentage of Assets | 3.7 | 3.8 | 3.8 | 4.0 | 4.1 | 4.4 | 4.5 | 4.9 | 4.9 | 5.1 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 4.4 | 4.4 | 4.7 | 5.1 | 5.5 | 5.8 | 6.0 |
| Percentage of OperatingLeaseRightOfUseAsset | 1.8 | 1.8 | 1.9 | 1.9 | 2.0 | 2.2 | 2.2 |
| Percentage of Assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 1.9 | 2.0 | 2.1 | 2.3 | 2.5 | 2.6 | 2.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 269 | 274 | 295 | 305 | 305 | 303 | 304 | 308 | 296 | 292 | 291 | 296 | 258 | 239 | 235 | 245 | 237 | 244 | 221 | 213 | 206 | 205 | 197 | 222 | 191 | 199 | 183 | 169 | 148 | 151 | 144 | 130 | 138 | 144 | 135 | 130 | 128 | 124 | 99 | 126 | 178 | 125 | 90 | 99 |
| Percentage of OtherAssetsNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 4.1 | 4.2 | 4.6 | 4.6 | 4.7 | 4.9 | 5.0 | 4.8 | 5.1 | 5.2 | 5.6 | 5.8 | 5.1 | 4.8 | 4.8 | 5.0 | 4.9 | 5.2 | 4.7 | 4.6 | 4.5 | 4.5 | 4.3 | 5.2 | 5.5 | 5.6 | 5.4 | 6.1 | 5.7 | 6.0 | 5.7 | 5.1 | 5.5 | 6.1 | 5.6 | 5.3 | 5.6 | 5.4 | 4.4 | 5.6 | 7.5 | 5.0 | 3.8 | 5.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 31 | 31 | 30 | 31 | 31 | 31 | 31 |
| Percentage of OtherAssetsNoncurrent | 11.5 | 11.3 | 10.4 | 10.1 | 10.2 | 10.3 | 10.3 |
| Percentage of Assets | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 13.5 | 14.2 | 13.8 | 14.0 | 14.0 | 14.1 | 14.6 |
| Period End | 2021-06-30 | 2019-12-31 | 2018-12-31 |
| Value | 3.0 | 0.0 | 0.0 |
| Percentage of EquitySecuritiesFvNi | 100.0 | 0.0 | 0.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:FairValueInputsLevel1 us-gaap:FairValueMeasurementsRecurring | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 76 | 73 | 72 | 63 | 55 |
| Percentage of EquitySecuritiesFvNi | 2563.3 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets | 1.2 | 1.1 | 1.1 | 1.0 | 1.1 |
| Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 70 | 69 | 61 | 63 |
| Percentage of EquitySecuritiesFvNi | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets | 1.1 | 1.1 | 1.0 | 1.0 |
| Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:FairValueMeasurementsRecurring us-gaap:MarketApproachValuationTechnique | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 79 | 73 | 72 | 63 | 55 |
| Percentage of EquitySecuritiesFvNi | 2663.3 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets | 1.2 | 1.1 | 1.1 | 1.0 | 1.1 |
| Percentage of Assets us-gaap:FairValueMeasurementsRecurring | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 70 | 69 | 61 | 63 |
| Percentage of EquitySecuritiesFvNi | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets | 1.1 | 1.1 | 1.0 | 1.0 |
| Percentage of Assets us-gaap:FairValueMeasurementsRecurring us-gaap:MarketApproachValuationTechnique | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 145 | 122 | 115 | 119 | 93 | 98 | 94 | 101 | 95 | 94 | 90 | 86 | 85 | 83 | 78 | 81 | 77 | 68 | 68 | 67 | 67 | 62 | 61 | 65 | 60 | 55 | 53 | 54 | 55 | 48 | 61 | 54 | 57 | 61 | 45 | 51 | 59 | 53 | 45 | 45 | 45 | 50 | 48 | 50 |
| Percentage of AccountsPayableCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 2.2 | 1.9 | 1.8 | 1.8 | 1.4 | 1.6 | 1.6 | 1.6 | 1.6 | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.6 | 1.7 | 1.6 | 1.5 | 1.5 | 1.5 | 1.4 | 1.4 | 1.3 | 1.5 | 1.7 | 1.5 | 1.6 | 2.0 | 2.2 | 1.9 | 2.4 | 2.1 | 2.3 | 2.6 | 1.9 | 2.1 | 2.6 | 2.3 | 2.0 | 2.0 | 1.9 | 2.0 | 2.1 | 3.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 6.9 | 5.9 | 6.1 | 7.4 | 6.6 | 5.6 | 6.7 |
| Percentage of AccountsPayableCurrent | 4.8 | 4.8 | 5.3 | 6.2 | 7.1 | 5.7 | 7.1 |
| Percentage of Assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 3.0 | 2.7 | 2.8 | 3.3 | 3.0 | 2.5 | 3.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 804 | 812 | 717 | 682 | 664 | 586 | 721 | 1108 | 752 | 768 | 672 | 609 | 573 | 572 | 517 | 511 | 493 | 487 | 475 | 476 | 459 | 463 | 426 | 403 | 364 | 497 | 364 | 514 | 299 | 302 | 311 | 311 | 311 | 317 | 300 | 377 | 324 | 314 | 313 | 288 | 319 | 337 | 359 | 391 |
| Percentage of LiabilitiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 12.2 | 12.4 | 11.1 | 10.3 | 10.2 | 9.6 | 11.9 | 17.4 | 13.0 | 13.8 | 13.0 | 11.9 | 11.3 | 11.6 | 10.6 | 10.5 | 10.2 | 10.4 | 10.2 | 10.3 | 9.9 | 10.1 | 9.3 | 9.5 | 10.5 | 13.9 | 10.7 | 18.4 | 11.6 | 11.9 | 12.3 | 12.2 | 12.4 | 13.3 | 12.4 | 15.4 | 14.0 | 13.7 | 13.8 | 12.7 | 13.4 | 13.6 | 15.1 | 23.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 32 | 30 | 31 | 28 | 26 | 24 | 25 |
| Percentage of LiabilitiesCurrent | 4.1 | 3.7 | 4.4 | 4.1 | 4.0 | 4.2 | 3.6 |
| Percentage of Assets | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 | 0.4 | 0.4 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 14.2 | 13.7 | 14.2 | 12.6 | 12.0 | 11.1 | 12.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 0.3 | 0.5 |
| Percentage of LiabilitiesCurrent | 0.0 | 0.1 |
| Percentage of Assets | 0.0 | 0.0 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 2.8 | 3.7 |
| Period End | 2021-03-31 |
| Value | 100 |
| Percentage of LongTermDebtCurrent | 100.0 |
| Percentage of Assets | 1.5 |
| Percentage of Assets ehc:SeniorNotes05.125Due2023 us-gaap:SeniorNotes | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 42 | 44 | 44 | 47 | 42 | 40 | 40 | 44 | 45 | 48 | 0.0 |
| Percentage of OperatingLeaseLiabilityCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Percentage of Assets | 0.6 | 0.7 | 0.7 | 0.7 | 0.6 | 0.7 | 0.7 | 0.7 | 0.8 | 0.9 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 1.6 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.4 |
| Percentage of OperatingLeaseLiabilityCurrent | 3.8 | 3.4 | 3.3 | 3.2 | 3.6 | 3.7 | 3.5 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 550 | 508 | 218 | 478 | 492 | 407 | 303 | 525 | 574 | 587 | 333 | 486 | 452 | 456 | 210 | 398 | 377 | 380 | 197 | 371 | 355 | 364 | 172 | 314 | 283 | 292 | 145 | 251 | 243 | 253 | 122 | 257 | 254 | 255 | 130 | 325 | 265 | 261 | 134 | 242 | 273 | 287 | 144 | 181 |
| Percentage of OtherLiabilitiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 8.3 | 7.8 | 3.4 | 7.2 | 7.6 | 6.6 | 5.0 | 8.2 | 9.9 | 10.5 | 6.5 | 9.5 | 8.9 | 9.2 | 4.3 | 8.2 | 7.8 | 8.1 | 4.2 | 8.0 | 7.7 | 7.9 | 3.7 | 7.4 | 8.2 | 8.2 | 4.3 | 9.0 | 9.5 | 10.0 | 4.8 | 10.1 | 10.1 | 10.7 | 5.4 | 13.3 | 11.4 | 11.4 | 5.9 | 10.7 | 11.5 | 11.6 | 6.1 | 10.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 23 | 21 | 11 | 18 | 17 | 16 | 17 |
| Percentage of OtherLiabilitiesCurrent | 4.2 | 4.3 | 5.4 | 3.8 | 3.6 | 4.1 | 5.6 |
| Percentage of Assets | 0.4 | 0.3 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 10.1 | 9.9 | 5.3 | 8.2 | 7.9 | 7.5 | 7.9 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 200000.0 | 300000.0 |
| Percentage of LiabilitiesNoncurrent | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 1.9 | 2.2 |
| Period End | 2021-06-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 45 | 0.0 | 350 | 45 | 0.0 | 335 | 30 | 95 | 138 | 70 | 85 | 152 | 150 | 130 |
| Percentage of LongTermDebt | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.7 | 0.0 | 5.7 | 0.7 | 0.0 | 5.8 | 0.6 | 1.9 | 2.8 | 1.4 | 1.8 | 3.2 | 3.2 | 2.8 |
| Percentage of Assets us-gaap:RevolvingCreditFacility | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 28 | 28 | 82 | 77 | 48 |
| Percentage of LongTermDebt | 0.0 | 62.2 | 276.0 | 81.8 | 31.7 |
| Percentage of Assets | 0.4 | 0.5 | 1.6 | 1.6 | 1.0 |
| Percentage of Assets ehc:NotesPayableRealEstateSaleLeasebackFinancing us-gaap:NotesPayableOtherPayables | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2018-12-31 |
| Value | 783 | 783 | 783 | 782 | 782 | 491 | 491 | 491 | 0.0 |
| Percentage of LongTermDebt | 1742.0 | 0.0 | 0.0 | 0.0 | 0.0 | 140.5 | 1092.7 | 0.0 | 0.0 |
| Percentage of Assets | 11.9 | 12.0 | 12.2 | 11.8 | 12.0 | 8.0 | 8.1 | 7.7 | 0.0 |
| Percentage of Assets ehc:SeniorNotes04.750Due2030 us-gaap:SeniorNotes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 99 | 298 | 298 | 297 | 297 | 297 | 297 | 297 | 297 | 296 | 295 | 295 |
| Percentage of LongTermDebt | 221.1 | 0.0 | 0.0 | 0.0 | 0.0 | 85.0 | 660.7 | 0.0 | 88.7 | 988.7 | 311.5 | 194.3 |
| Percentage of Assets | 1.5 | 4.6 | 4.6 | 4.5 | 4.6 | 4.8 | 4.9 | 4.7 | 5.1 | 5.7 | 6.0 | 6.3 |
| Percentage of Assets ehc:SeniorNotes05.125Due2023 us-gaap:SeniorNotes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 346 | 346 | 346 | 346 | 346 | 345 | 345 | 345 | 345 | 345 | 344 | 343 |
| Percentage of LongTermDebt | 770.2 | 0.0 | 0.0 | 0.0 | 0.0 | 98.8 | 768.0 | 0.0 | 103.1 | 1150.0 | 362.5 | 226.2 |
| Percentage of Assets | 5.2 | 5.3 | 5.4 | 5.2 | 5.3 | 5.6 | 5.7 | 5.4 | 5.9 | 6.7 | 7.0 | 7.3 |
| Percentage of Assets ehc:SeniorNotes05.75Due2025 us-gaap:SeniorNotes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-11-30 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 700 | 697 | 697 | 697 | 697 | 1095 | 1095 | 1194 | 1193 | 1193 |
| Percentage of LongTermDebt | 0.0 | 0.0 | 0.0 | 199.3 | 1549.6 | 0.0 | 327.0 | 3982.3 | 1256.7 | 785.0 |
| Percentage of Assets | 0.0 | 10.6 | 10.7 | 11.4 | 11.5 | 17.2 | 18.8 | 23.1 | 24.4 | 25.5 |
| Percentage of Assets ehc:SeniorNotes0575Due2024 us-gaap:SeniorNotes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2018-12-31 |
| Value | 785 | 785 | 785 | 784 | 784 | 491 | 491 | 0.0 |
| Percentage of LongTermDebt | 1746.4 | 0.0 | 0.0 | 0.0 | 0.0 | 140.5 | 1092.7 | 0.0 |
| Percentage of Assets | 11.9 | 12.0 | 12.2 | 11.9 | 12.1 | 8.0 | 8.1 | 0.0 |
| Percentage of Assets ehc:SeniorNotes4.50Due2028 us-gaap:SeniorNotes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 393 | 393 | 393 |
| Percentage of LongTermDebt | 874.2 | 0.0 | 0.0 |
| Percentage of Assets | 5.9 | 6.0 | 6.1 |
| Percentage of Assets ehc:SeniorNotes4625Due2031 us-gaap:SeniorNotes | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 245 | 248 | 251 | 254 | 258 | 261 | 265 | 269 | 272 | 280 | 294 | 421 |
| Percentage of LongTermDebt | 544.7 | 0.0 | 0.0 | 0.0 | 0.0 | 74.8 | 589.3 | 0.0 | 81.4 | 933.7 | 310.2 | 277.1 |
| Percentage of Assets | 3.7 | 3.8 | 3.9 | 3.9 | 4.0 | 4.3 | 4.4 | 4.2 | 4.7 | 5.4 | 6.0 | 9.0 |
| Percentage of Assets ehc:TermLoanFacilities us-gaap:LoansPayable | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-10-31 |
| Value | 700 |
| Percentage of LongTermDebt | 0.0 |
| Percentage of Assets | 0.0 |
| Percentage of Assets ehc:SeniorNotes0575Due2024 us-gaap:SeniorNotes us-gaap:SubsequentEvent | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 11 | 12 | 14 | 4.4 | 7.4 |
| Percentage of LongTermDebt | 0.0 | 28.7 | 48.7 | 4.6 | 4.9 |
| Percentage of Assets | 0.2 | 0.2 | 0.3 | 0.1 | 0.2 |
| Percentage of Assets ehc:NotesPayableLIBORplus2.5ConstructionFinancing us-gaap:NotesPayableOtherPayables us-gaap:LondonInterbankOfferedRateLIBOR | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 50 | 39 | 39 | 40 | 40 | 44 | 44 | 44 | 16 | 104 | 82 | 80 | 74 | 63 | 55 | 47 | 39 |
| Percentage of LongTermDebt | 111.6 | 0.0 | 0.0 | 0.0 | 0.0 | 12.7 | 99.3 | 0.0 | 5.0 | 347.3 | 86.6 | 58.0 | 105.9 | 74.2 | 36.7 | 31.4 | 30.2 |
| Percentage of Assets | 0.8 | 0.6 | 0.6 | 0.6 | 0.6 | 0.7 | 0.7 | 0.7 | 0.3 | 2.0 | 1.7 | 1.6 | 1.5 | 1.3 | 1.2 | 1.0 | 0.9 |
| Percentage of Assets us-gaap:NotesPayableOtherPayables | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2018-12-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2011-12-31 |
| Value | 3172 | 3297 | 3288 | 3576 | 3583 | 3362 | 3062 | 3399 | 2757 | 2514 | 2577 | 2622 | 2663 | 2953 | 3016 | 3010 | 3086 | 3116 | 3171 | 2824 | 2125 | 2272 | 2131 | 1649 | 1517 | 1319 | 1330 | 1377 | 1253 | 1321 | 1254 |
| Percentage of DebtAndCapitalLeaseObligations | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 48.0 | 50.4 | 51.0 | 54.1 | 55.1 | 54.8 | 50.4 | 53.2 | 47.4 | 48.6 | 52.7 | 53.7 | 55.0 | 62.8 | 64.4 | 65.0 | 66.6 | 67.6 | 68.9 | 66.5 | 61.3 | 63.5 | 62.5 | 59.1 | 59.9 | 51.6 | 53.0 | 57.6 | 51.7 | 53.8 | 55.2 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2010-12-31 |
| Value | 3105 | 3160 | 3250 | 3539 | 3546 | 3321 | 3023 | 2961 | 2719 | 2521 | 2478 | 2503 | 2600 | 2544 | 2545 | 2591 | 2625 | 2915 | 2979 | 2974 | 3050 | 3079 | 3134 | 2800 | 2104 | 2122 | 2110 | 1441 | 1475 | 1503 | 1505 | 1306 | 1319 | 1365 | 1239 | 1242 | 1235 | 1308 | 1440 | 1496 |
| Percentage of LongTermDebtAndCapitalLeaseObligations | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 47.0 | 48.3 | 50.4 | 53.5 | 54.5 | 54.1 | 49.7 | 46.4 | 46.8 | 45.2 | 47.9 | 48.8 | 51.1 | 51.5 | 52.0 | 53.1 | 54.2 | 62.0 | 63.6 | 64.2 | 65.8 | 66.8 | 68.1 | 65.9 | 60.7 | 59.3 | 61.9 | 51.6 | 57.3 | 59.2 | 59.4 | 51.1 | 52.5 | 57.1 | 51.2 | 50.6 | 54.4 | 57.6 | 60.6 | 63.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 9.1 | 9.4 | 9.6 | 9.8 | 10 | 10 | 10 |
| Percentage of LongTermDebtAndCapitalLeaseObligations | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Percentage of Assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 3.9 | 4.3 | 4.3 | 4.4 | 4.6 | 4.6 | 4.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 61 | 60 | 51 |
| Percentage of DeferredIncomeTaxLiabilitiesNet | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.9 | 0.9 | 0.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 414 | 387 | 382 | 374 | 368 | 353 | 340 | 338 | 307 | 302 | 280 | 265 | 246 | 243 | 242 | 236 | 219 | 199 | 192 | 187 | 176 | 174 | 167 | 159 | 158 | 148 | 146 | 143 | 141 | 126 | 124 | 120 | 117 | 115 | 112 | 111 | 97 | 86 | 84 | 83 | 83 | 83 | 83 | 76 |
| Percentage of MinorityInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 6.3 | 5.9 | 5.9 | 5.7 | 5.7 | 5.8 | 5.6 | 5.3 | 5.3 | 5.4 | 5.4 | 5.2 | 4.8 | 4.9 | 5.0 | 4.8 | 4.5 | 4.2 | 4.1 | 4.0 | 3.8 | 3.8 | 3.6 | 3.8 | 4.6 | 4.1 | 4.3 | 5.1 | 5.5 | 5.0 | 4.9 | 4.7 | 4.7 | 4.8 | 4.6 | 4.5 | 4.2 | 3.8 | 3.7 | 3.7 | 3.5 | 3.4 | 3.5 | 4.5 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 6.6 | 7.8 |
| Percentage of MinorityInterest | 1.7 | 2.3 |
| Percentage of Assets | 0.1 | 0.1 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 62.3 | 57.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2010-12-31 |
| Value | 219 | 220 | 93 | 230 | 191 | 163 | 42 | 161 | 157 | 159 | 85 | 198 | 189 | 183 | 75 | 186 | 182 | 168 | 49 | 158 | 154 | 144 | 43 | 140 | 137 | 139 | 37 | 139 | 141 | 145 | 44 | 140 | 131 | 130 | 30 | 137 | 135 | 135 | 30 | 135 | 130 |
| Percentage of OtherLiabilitiesNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 3.3 | 3.4 | 1.5 | 3.5 | 2.9 | 2.7 | 0.7 | 2.5 | 2.7 | 2.9 | 1.7 | 3.9 | 3.7 | 3.7 | 1.5 | 3.8 | 3.8 | 3.6 | 1.1 | 3.4 | 3.3 | 3.1 | 0.9 | 3.3 | 4.0 | 3.9 | 1.1 | 5.0 | 5.5 | 5.7 | 1.7 | 5.5 | 5.2 | 5.5 | 1.2 | 5.6 | 5.9 | 5.9 | 1.3 | 5.9 | 5.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 |
| Value | 2.4 | 2.3 | 2.4 | 3.1 | 1.5 | 0.0 |
| Percentage of OtherLiabilitiesNoncurrent | 1.1 | 1.0 | 2.6 | 1.3 | 0.8 | 0.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 1.0 | 1.0 | 1.1 | 1.4 | 0.7 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 212 | 214 | 209 | 228 | 234 | 235 | 243 | 273 | 245 | 245 | 0.0 |
| Percentage of OperatingLeaseLiabilityNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Percentage of Assets | 3.2 | 3.3 | 3.3 | 3.5 | 3.6 | 3.8 | 4.0 | 4.3 | 4.2 | 4.4 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 2.9 | 2.9 | 3.3 | 3.7 | 4.0 | 4.4 | 4.7 |
| Percentage of OperatingLeaseLiabilityNoncurrent | 1.4 | 1.4 | 1.6 | 1.6 | 1.7 | 1.9 | 1.9 |
| Percentage of Assets | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Percentage of Assets us-gaap:VariableInterestEntityPrimaryBeneficiary | 1.3 | 1.3 | 1.5 | 1.7 | 1.8 | 2.0 | 2.2 |
| Period End | 2020-12-31 |
| Value | 47 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo | 100.0 |
| Percentage of Assets | 0.7 |
| Period End | 2020-12-31 |
| Value | 42 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree | 100.0 |
| Percentage of Assets | 0.7 |
| Period End | 2020-12-31 |
| Value | 35 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour | 100.0 |
| Percentage of Assets | 0.6 |
| Period End | 2020-12-31 |
| Value | 26 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive | 100.0 |
| Percentage of Assets | 0.4 |
| Period End | 2020-12-31 |
| Value | 254 |
| Percentage of OperatingLeaseLiability | 100.0 |
| Percentage of Assets | 3.9 |
| Period End | 2020-12-31 |
| Value | 338 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDue | 100.0 |
| Percentage of Assets | 5.2 |
| Period End | 2020-12-31 |
| Value | 83 |
| Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount | 100.0 |
| Percentage of Assets | 1.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 | 2009-12-31 | 2008-12-31 | 2007-12-31 |
| Value | 1762 | 1655 | 1588 | 1520 | 1462 | 1443 | 1352 | 1333 | 1275 | 1314 | 1276 | 1318 | 1254 | 1197 | 1181 | 1136 | 1103 | 779 | 735 | 726 | 672 | 649 | 611 | 630 | 605 | 492 | 473 | 449 | 413 | 355 | 344 | 321 | 274 | 108 | 291 | 244 | 195 | 149 | 117 | 151 | 96 | 72 | -2.2 | -782.3 | -817.3 | -861.9 | -897.6 | -1087.2 | -1457.3 |
| Percentage of StockholdersEquity | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 26.6 | 25.3 | 24.6 | 23.0 | 22.5 | 23.5 | 22.2 | 20.9 | 22.0 | 23.5 | 24.7 | 25.7 | 24.7 | 24.2 | 24.1 | 23.3 | 22.8 | 16.6 | 15.7 | 15.7 | 14.5 | 14.1 | 13.3 | 14.8 | 17.5 | 13.8 | 13.9 | 16.1 | 16.1 | 14.0 | 13.6 | 12.6 | 10.9 | 4.5 | 12.0 | 10.0 | 8.5 | 6.5 | 5.2 | 6.7 | 4.1 | 2.9 | -0.1 | 0.0 | 0.0 | 0.0 | -53.4 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3.5 | 4.9 |
| Percentage of StockholdersEquity | 0.2 | 0.4 |
| Percentage of Assets | 0.1 | 0.1 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 33.0 | 36.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | 2176 | 2043 | 1970 | 1895 | 1831 | 1797 | 1693 | 1671 | 1583 | 1616 | 1557 | 1583 | 1501 | 1440 | 1424 | 1373 | 1323 | 979 | 928 | 913 | 849 | 823 | 779 | 790 | 764 | 640 | 619 | 592 | 555 | 482 | 468 | 442 | 392 | 223 | 404 | 356 | 293 | 235 | 201 | 67 | 13 | -11.6 | -85.2 | -974.0 | -1087.2 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 32.9 | 31.2 | 30.6 | 28.7 | 28.2 | 29.3 | 27.8 | 26.2 | 27.3 | 28.9 | 30.1 | 30.9 | 29.5 | 29.2 | 29.1 | 28.1 | 27.3 | 20.8 | 19.8 | 19.7 | 18.3 | 17.9 | 16.9 | 18.6 | 22.0 | 17.9 | 18.2 | 21.2 | 21.6 | 19.0 | 18.5 | 17.3 | 15.6 | 9.3 | 16.7 | 14.5 | 12.7 | 10.3 | 8.9 | 3.0 | 0.6 | -0.5 | -3.6 | -57.9 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | 2300 | 2302 | 2326 | 2343 | 2362 | 2376 | 2369 | 2417 | 2455 | 2551 | 2588 | 2673 | 2698 | 2731 | 2791 | 2806 | 2818 | 2800 | 2799 | 2806 | 2814 | 2842 | 2834 | 2855 | 2878 | 2805 | 2810 | 2828 | 2841 | 2849 | 2849 | 2874 | 2886 | 2882 | 2877 | 2876 | 2875 | 2874 | 2874 | 2875 | 2876 | 2871 | 2873 | 2879 | 2956 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 105.7 | 112.7 | 118.1 | 123.6 | 129.0 | 132.2 | 140.0 | 144.7 | 155.0 | 157.8 | 166.3 | 168.8 | 179.7 | 189.6 | 195.9 | 204.3 | 213.1 | 286.0 | 301.4 | 307.2 | 331.4 | 345.0 | 363.8 | 361.3 | 376.4 | 438.1 | 453.7 | 477.1 | 511.6 | 590.9 | 607.9 | 650.3 | 735.0 | 1289.6 | 712.0 | 807.9 | 979.0 | 1218.4 | 1425.9 | 4234.2 | 21304.4 | -24754.3 | -3372.7 | -295.7 | -271.9 |
| Percentage of Assets | 34.8 | 35.2 | 36.1 | 35.4 | 36.3 | 38.7 | 39.0 | 37.9 | 42.2 | 45.7 | 50.0 | 52.1 | 53.0 | 55.3 | 57.0 | 57.5 | 58.2 | 59.5 | 59.8 | 60.6 | 60.8 | 61.7 | 61.5 | 67.2 | 83.0 | 78.4 | 82.4 | 101.2 | 110.3 | 112.2 | 112.4 | 112.4 | 114.9 | 120.5 | 118.7 | 117.1 | 124.2 | 125.2 | 126.6 | 126.6 | 121.0 | 115.7 | 121.1 | 171.3 | 0.0 |
| Percentage of Assets us-gaap:AdditionalPaidInCapital | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.4 | 0.2 | 0.3 | 0.3 | 0.4 | 0.5 | 1.5 | 7.4 | -8.6 | -1.2 | -0.1 | -0.1 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 |
| Percentage of Assets us-gaap:CommonStock | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | 414 | 387 | 382 | 374 | 368 | 353 | 340 | 338 | 307 | 302 | 280 | 265 | 246 | 243 | 242 | 236 | 219 | 199 | 192 | 187 | 176 | 174 | 167 | 159 | 158 | 148 | 146 | 143 | 141 | 126 | 124 | 120 | 117 | 115 | 112 | 111 | 97 | 86 | 84 | 83 | 83 | 83 | 83 | 76 | 82 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 19.0 | 19.0 | 19.4 | 19.8 | 20.1 | 19.7 | 20.1 | 20.2 | 19.4 | 18.7 | 18.0 | 16.7 | 16.4 | 16.9 | 17.1 | 17.2 | 16.6 | 20.4 | 20.8 | 20.5 | 20.8 | 21.2 | 21.5 | 20.2 | 20.8 | 23.1 | 23.6 | 24.2 | 25.5 | 26.3 | 26.5 | 27.4 | 30.0 | 51.5 | 27.8 | 31.3 | 33.3 | 36.7 | 42.0 | 123.6 | 615.6 | -723.3 | -97.4 | -7.8 | -7.6 |
| Percentage of Assets | 6.3 | 5.9 | 5.9 | 5.7 | 5.7 | 5.8 | 5.6 | 5.3 | 5.3 | 5.4 | 5.4 | 5.2 | 4.8 | 4.9 | 5.0 | 4.8 | 4.5 | 4.2 | 4.1 | 4.0 | 3.8 | 3.8 | 3.6 | 3.8 | 4.6 | 4.1 | 4.3 | 5.1 | 5.5 | 5.0 | 4.9 | 4.7 | 4.7 | 4.8 | 4.6 | 4.5 | 4.2 | 3.8 | 3.7 | 3.7 | 3.5 | 3.4 | 3.5 | 4.5 | 0.0 |
| Percentage of Assets us-gaap:NoncontrollingInterest | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | -21.7 | -135.0 | -242.3 | -328.3 | -406.0 | -439.5 | -526.5 | -594.1 | -691.7 | -782.9 | -885.2 | -928.1 | -1016.7 | -1108.5 | -1191.0 | -1251.6 | -1317.5 | -1380.4 | -1448.4 | -1513.7 | -1575.4 | -1638.0 | -1696.0 | -1743.0 | -1793.9 | -1836.6 | -1879.1 | -1921.2 | -1971.3 | -2054.4 | -2101.1 | -2150.0 | -2208.2 | -2373.4 | -2424.7 | -2471.7 | -2518.8 | -2565.5 | -2609.7 | -2659.7 | -2716.7 | -2738.6 | -2818.4 | -3717.4 | -3812.2 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -1.0 | -6.6 | -12.3 | -17.3 | -22.2 | -24.5 | -31.1 | -35.5 | -43.7 | -48.4 | -56.9 | -58.6 | -67.7 | -76.9 | -83.6 | -91.1 | -99.6 | -141.0 | -156.0 | -165.6 | -185.5 | -198.8 | -217.6 | -220.6 | -234.6 | -286.8 | -303.3 | -324.1 | -354.9 | -426.0 | -448.3 | -486.4 | -562.3 | -1061.9 | -600.0 | -694.3 | -857.6 | -1087.5 | -1294.5 | -3917.1 | -20123.7 | 23608.6 | 3308.0 | 381.7 | 350.6 |
| Percentage of Assets | -0.3 | -2.1 | -3.8 | -5.0 | -6.2 | -7.2 | -8.7 | -9.3 | -11.9 | -14.0 | -17.1 | -18.1 | -20.0 | -22.4 | -24.3 | -25.6 | -27.2 | -29.3 | -30.9 | -32.7 | -34.0 | -35.5 | -36.8 | -41.0 | -51.7 | -51.3 | -55.1 | -68.8 | -76.5 | -80.9 | -82.9 | -84.1 | -87.9 | -99.2 | -100.0 | -100.6 | -108.8 | -111.8 | -114.9 | -117.1 | -114.3 | -110.4 | -118.8 | -221.1 | 0.0 |
| Percentage of Assets us-gaap:RetainedEarnings | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | -518.0 | -513.7 | -497.4 | -495.1 | -494.7 | -493.9 | -492.3 | -491.7 | -489.1 | -455.2 | -427.9 | -427.7 | -427.5 | -427.2 | -418.5 | -418.2 | -397.8 | -640.2 | -614.7 | -566.9 | -566.7 | -555.0 | -527.4 | -481.9 | -479.4 | -477.3 | -458.7 | -458.1 | -457.6 | -440.3 | -404.6 | -404.2 | -404.0 | -403.1 | -163.3 | -162.8 | -162.4 | -160.9 | -148.8 | -148.6 | -147.8 | -146.2 | -141.8 | -137.5 | -311.5 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -23.8 | -25.1 | -25.2 | -26.1 | -27.0 | -27.5 | -29.1 | -29.4 | -30.9 | -28.2 | -27.5 | -27.0 | -28.5 | -29.7 | -29.4 | -30.5 | -30.1 | -65.4 | -66.2 | -62.0 | -66.7 | -67.4 | -67.7 | -61.0 | -62.7 | -74.5 | -74.0 | -77.3 | -82.4 | -91.3 | -86.3 | -91.4 | -102.9 | -180.4 | -40.4 | -45.7 | -55.3 | -68.2 | -73.8 | -218.9 | -1094.8 | 1260.3 | 166.4 | 14.1 | 28.7 |
| Percentage of Assets | -7.8 | -7.9 | -7.7 | -7.5 | -7.6 | -8.0 | -8.1 | -7.7 | -8.4 | -8.2 | -8.3 | -8.3 | -8.4 | -8.6 | -8.6 | -8.6 | -8.2 | -13.6 | -13.1 | -12.2 | -12.2 | -12.0 | -11.5 | -11.3 | -13.8 | -13.3 | -13.5 | -16.4 | -17.8 | -17.3 | -16.0 | -15.8 | -16.1 | -16.8 | -6.7 | -6.6 | -7.0 | -7.0 | -6.6 | -6.5 | -6.2 | -5.9 | -6.0 | -8.2 | 0.0 |
| Percentage of Assets us-gaap:TreasuryStock | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 1100000.0 | 1100000.0 | 1100000.0 | 1100000.0 | 1100000.0 | 1100000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 |
| Percentage of CommonStockValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 2326 | 2369 | 2588 | 2791 | 2799 | 2834 | 2810 | 2828 | 2841 | 2849 | 2849 | 2874 | 2886 | 2882 | 2877 | 2874 | 2873 | 2879 |
| Percentage of AdditionalPaidInCapital | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 36.1 | 39.0 | 50.0 | 57.0 | 59.8 | 61.5 | 82.4 | 101.2 | 110.3 | 112.2 | 112.4 | 112.4 | 114.9 | 120.5 | 118.7 | 126.6 | 121.1 | 171.3 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | -242.3 | -526.5 | -885.2 | -1191.0 | -1448.4 | -1696.0 | -1879.1 | -1921.2 | -1971.3 | -2054.4 | -2101.1 | -2150.0 | -2208.2 | -2373.4 | -2424.7 | -2609.7 | -2818.4 | -3717.4 |
| Percentage of RetainedEarningsAccumulatedDeficit | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | -3.8 | -8.7 | -17.1 | -24.3 | -30.9 | -36.8 | -55.1 | -68.8 | -76.5 | -80.9 | -82.9 | -84.1 | -87.9 | -99.2 | -100.0 | -114.9 | -118.8 | -221.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 497 | 492 | 427 | 418 | 614 | 527 | 458 | 458 | 457 | 440 | 404 | 404 | 404 | 403 | 163 | 148 | 141 | 137 |
| Percentage of TreasuryStockValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 7.7 | 8.1 | 8.3 | 8.6 | 13.1 | 11.5 | 13.5 | 16.4 | 17.8 | 17.3 | 16.0 | 15.8 | 16.1 | 16.8 | 6.7 | 6.6 | 6.0 | 8.2 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2009-12-31 |
| Value | 414 | 387 | 382 | 374 | 368 | 353 | 340 | 338 | 307 | 302 | 280 | 265 | 246 | 243 | 242 | 236 | 219 | 199 | 192 | 187 | 176 | 174 | 167 | 159 | 158 | 148 | 146 | 143 | 141 | 126 | 124 | 120 | 117 | 115 | 112 | 111 | 97 | 86 | 84 | 83 | 83 | 83 | 83 | 76 |
| Percentage of MinorityInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 6.3 | 5.9 | 5.9 | 5.7 | 5.7 | 5.8 | 5.6 | 5.3 | 5.3 | 5.4 | 5.4 | 5.2 | 4.8 | 4.9 | 5.0 | 4.8 | 4.5 | 4.2 | 4.1 | 4.0 | 3.8 | 3.8 | 3.6 | 3.8 | 4.6 | 4.1 | 4.3 | 5.1 | 5.5 | 5.0 | 4.9 | 4.7 | 4.7 | 4.8 | 4.6 | 4.5 | 4.2 | 3.8 | 3.7 | 3.7 | 3.5 | 3.4 | 3.5 | 4.5 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 6.6 | 7.8 |
| Percentage of MinorityInterest | 1.7 | 2.3 |
| Percentage of Assets | 0.1 | 0.1 |
| Percentage of Assets us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvestees | 62.3 | 57.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 12 | 2.8 | 4.2 | 8.3 | 9.9 | 7.1 | 8.3 | 7.8 | 9.3 | 7.0 | 8.3 | 7.3 | 8.0 | 5.3 | 6.1 | 5.5 | 6.3 | 3.4 | 5.3 | 4.6 | 5.6 | 5.9 | 3.4 | 4.1 | 5.8 | 9.1 | 4.6 | 5.0 | 7.0 | 7.3 | 5.8 | 6.2 | 6.5 | 6.3 | 6.0 | 6.1 | 5.9 | 6.1 | 5.9 | 4.9 | 5.3 | 4.2 | 5.2 | 3.4 | 4.0 | 3.8 |
| Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 12 | 2.8 | 4.2 | 8.3 | 9.9 | 7.1 | 8.3 | 7.8 | 9.3 | 7.0 | 8.3 | 7.3 | 8.0 | 5.3 | 6.1 | 5.5 | 6.3 | 3.4 | 5.3 | 4.6 | 5.6 | 5.9 | 3.4 | 4.1 | 5.8 | 9.1 | 4.6 | 5.0 | 7.0 | 7.3 | 5.8 | 6.2 | 6.5 | 6.3 | 6.0 | 6.1 | 5.9 | 6.1 | 5.9 | 4.9 | 5.3 | 4.2 | 5.2 | 3.4 | 4.0 | 3.8 |
| Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:AdditionalPaidInCapital | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 23 | 22 | 21 | 21 | 13 | 15 | 17 | 20 | 17 | 15 | 17 | 16 | 19 | 17 | 13 | 14 | 12 | 10 | 11 | 13 | 12 | 17 | 12 | 13 | 11 | 12 | 11 | 11 | 12 | 10 | 10 | 9.7 | 9.8 | 10 | 11 | 13 | 10 | 9.7 | 11 | 49 | -30.0 | 9.8 | 10 | 42 | -24.9 | 7.9 |
| Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 2.1 | 2.3 | 2.7 | 1.6 | 2.1 | 2.1 | 1.6 | 2.8 | 3.0 | 1.8 | 2.0 | 2.0 | 2.4 | 2.2 | 1.3 | 0.2 | 1.2 | 1.9 |
| Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | 9.1 | 10.3 | 12.7 | 7.3 | 15.4 | 13.5 | 9.2 | 13.9 | 17.3 | 11.8 | 11.5 | 11.8 | 12.6 | 12.4 | 9.7 | 1.4 | 9.7 | 18.1 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets ehc:RedeemableNoncontrollingInterest | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 23 | 22 | 21 | 21 | 13 | 15 | 17 | 20 | 17 | 15 | 17 | 16 | 19 | 17 | 13 | 14 | 12 | 10 | 11 | 13 | 12 | 17 | 12 | 13 | 11 | 12 | 11 | 11 | 12 | 10 | 10 | 9.7 | 9.8 | 10 | 11 | 13 | 10 | 9.7 | 11 | 49 | -30.0 | 9.8 | 10 | 42 | -24.9 | 7.9 |
| Percentage of MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:NoncontrollingInterest | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 255 | 158 | 279 | 173 | 222 | 29 | 215 | 114 | 145 | 159 | 178 | 198 | 169 | 216 | 151 | 173 | 151 | 180 | 116 | 177 | 152 | 159 | 116 | 163 | 102 | 102 | 70 | 139 | 128 | 107 | 100 | 142 | 105 | 121 | 109 | 107 | 114 | 81 | 131 | 53 | 67 | 89 | 67 | 90 | 88 | 84 |
| Percentage of NetCashProvidedByUsedInOperatingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 19.9 | 12.9 | 23.0 | 14.8 | 20.7 | 2.5 | 18.2 | 9.8 | 12.8 | 14.2 | 16.3 | 18.6 | 15.8 | 20.7 | 15.0 | 17.7 | 15.6 | 18.9 | 12.2 | 19.2 | 16.5 | 17.6 | 13.3 | 21.0 | 13.5 | 13.8 | 11.4 | 23.4 | 21.2 | 18.1 | 17.6 | 25.3 | 18.7 | 21.2 | 19.8 | 20.0 | 21.4 | 15.0 | 25.5 | 10.8 | 13.4 | 16.6 | 13.7 | 19.7 | 18.9 | 17.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -226.0 | -95.6 | -142.7 | -89.7 | -92.1 | -83.0 | -145.7 | -320.1 | -100.1 | -91.5 | -98.2 | -65.3 | -200.4 | -60.6 | -75.3 | -77.6 | -77.8 | -53.8 | -88.7 | -50.8 | -66.0 | -39.5 | -950.4 | -52.7 | -81.0 | -45.7 | -714.6 | -55.3 | -39.2 | -67.8 | -29.0 | -95.8 | -53.5 | -47.9 | -54.5 | -36.0 | -55.4 | -32.9 | -57.3 | 81 | -25.8 | -23.4 | -35.1 | -50.7 | -13.9 | -26.2 |
| Percentage of NetCashProvidedByUsedInInvestingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -17.6 | -7.8 | -11.8 | -7.6 | -8.6 | -7.0 | -12.3 | -27.6 | -8.8 | -8.1 | -9.0 | -6.1 | -18.8 | -5.8 | -7.5 | -7.9 | -8.1 | -5.6 | -9.3 | -5.5 | -7.2 | -4.3 | -108.1 | -6.8 | -10.6 | -6.2 | -116.5 | -9.3 | -6.5 | -11.5 | -5.1 | -17.0 | -9.5 | -8.4 | -9.9 | -6.7 | -10.4 | -6.1 | -11.1 | 16.5 | -5.1 | -4.3 | -7.2 | -11.0 | -3.0 | -5.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -186.39999999999998 | -77.5 | -354.2 | -45.6 | 182 | 71 | -424.1 | 431 | 122 | -81.7 | -67.7 | -137.0 | 0.2 | -116.7 | -89.3 | -99.7 | -63.5 | -106.3 | -63.2 | -120.7 | -89.1 | -108.6 | 93 | 645 | -184.7 | 85 | 438 | 122 | -76.1 | -50.7 | -72.4 | -50.5 | -63.3 | -126.2 | -85.2 | 50 | -61.7 | -33.9 | -92.2 | -148.4 | -122.7 | 26 | -174.1 | -22.2 | -18.7 | -22.7 |
| Percentage of NetCashProvidedByUsedInFinancingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -14.5 | -6.3 | -29.2 | -3.9 | 17.0 | 6.0 | -35.8 | 37.2 | 10.8 | -7.3 | -6.2 | -12.8 | 0.0 | -11.2 | -8.9 | -10.2 | -6.6 | -11.1 | -6.7 | -13.0 | -9.7 | -11.9 | 10.7 | 82.9 | -24.2 | 11.5 | 71.5 | 20.5 | -12.6 | -8.6 | -12.7 | -9.0 | -11.2 | -22.0 | -15.4 | 9.5 | -11.6 | -6.3 | -17.8 | -29.8 | -24.3 | 5.0 | -35.5 | -4.8 | -4.0 | -4.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 |
| Value | -156.5 | -14.6 | -217.2 | 38 | 313 | 17 | -354.2 | 226 |
| Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -12.2 | -1.2 | -17.9 | 3.2 | 29.1 | 1.5 | -29.9 | 19.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -2.5 | 8.7 | 58 | 3.4 | -10.5 | 1.4 | 19 | 20 | -2.1 | 2.6 | -1.1 | -4.4 | -0.6 | -3.0 | 24 | 7.1 | -4.8 | 49 | 22 | 37 | 38 | 34 | 39 | 32 | 28 | 26 | 15 | 18 | 33 | 29 | 27 | 32 | -85.2 | 31 | 22 | 28 | 24 | 27 | 13 | 18 | 8.6 | -3.4 | -740.9 | 0.3 | 1.7 | 0.4 |
| Percentage of DeferredIncomeTaxExpenseBenefit | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 63 | 62 | 62 | 61 | 60 | 58 | 58 | 55 | 52 | 52 | 52 | 51 | 49 | 45 | 46 | 46 | 45 | 45 | 43 | 43 | 42 | 42 | 41 | 33 | 32 | 31 | 27 | 27 | 26 | 26 | 25 | 24 | 23 | 22 | 21 | 21 | 20 | 19 | 20 | 19 | 19 | 20 | 22 | 18 | 17 | 18 |
| Percentage of DepreciationDepletionAndAmortization | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | 63 | 62 | 62 | 61 | 60 | 58 | 58 | 55 | 52 | 52 | 52 | 51 | 49 | 45 | 321 | -46.2 | -45.8 | -45.2 | 43 | 43 | -42.9 | -42.4 | 41 | 33 |
| Percentage of DepreciationDepletionAndAmortization | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 688.8 | -100.0 | -100.0 | -100.0 | 100.0 | 100.0 | -100.0 | -100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 3.3 | 10 | -1.9 | 0.3 | 6.6 | 0.4 | -1.7 | 1.3 | 1.4 | 6.5 | 1.3 | -1.7 | 4.4 | 0.7 | 0.6 | 0.6 | -3.5 | 2.7 | -0.4 | 2.1 | 1.7 | 1.0 | 0.1 | 2.6 | -3.5 | 0.4 | -2.6 | 12 | -5.8 | -8.9 | 4.3 | 6.0 | 0.0 | 0.0 | -1.1 | 1.9 | -0.9 | 1.8 | 0.7 | -2.9 |
| Percentage of IncreaseDecreaseInAccountsPayable | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -17.0 | 55 | -33.7 | 33 | 1.9 | 36 | -14.9 | 15 | -7.0 | 29 | 5.3 | -2.4 | -1.6 | -8.3 | 29 | 27 | 6.5 | 20 | 51 | 16 | 13 | 45 | 50 | 21 | 24 | 37 | 42 | 13 | 10 | 24 | 28 | -12.3 | 14 | 24 | 9.0 | 6.6 | 8.2 | 27 | 9.7 | 11 | -5.5 | 21 | 12 | -5.5 | -4.2 | 21 |
| Percentage of IncreaseDecreaseInAccountsReceivable | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 255 | 158 | 279 | 173 | 222 | 29 | 215 | 114 | 145 | 159 | 178 | 198 | 169 | 216 | 151 | 173 | 151 | 180 | 116 | 177 | 152 | 159 | 116 | 163 | 102 | 102 | 70 | 139 | 128 | 107 | 100 | 142 | 105 | 121 | 109 | 107 | 114 | 81 | 131 | 53 | 67 | 89 | 67 | 90 | 88 | 84 |
| Percentage of NetCashProvidedByUsedInOperatingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 19.9 | 12.9 | 23.0 | 14.8 | 20.7 | 2.5 | 18.2 | 9.8 | 12.8 | 14.2 | 16.3 | 18.6 | 15.8 | 20.7 | 15.0 | 17.7 | 15.6 | 18.9 | 12.2 | 19.2 | 16.5 | 17.6 | 13.3 | 21.0 | 13.5 | 13.8 | 11.4 | 23.4 | 21.2 | 18.1 | 17.6 | 25.3 | 18.7 | 21.2 | 19.8 | 20.0 | 21.4 | 15.0 | 25.5 | 10.8 | 13.4 | 16.6 | 13.7 | 19.7 | 18.9 | 17.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 28 | 88 | 91 | 83 | 60 | 65 | 63 | 66 | 65 | 61 | 62 | 58 | 47 | 50 | 42 | 42 | 42 | 50 | 83 | 46 | 48 | 58 | 165 | 51 | 47 | 47 | 46 | 44 | 50 | 57 | 21 | 79 | 779 | 31 | 47 | 40 |
| Percentage of NetIncomeLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 8.8 | 8.7 | 7.1 | 6.6 | 3.1 | 7.4 | 5.7 | 8.4 | 8.0 | 9.1 | 2.6 | 8.3 | 8.6 | 8.0 | 6.0 | 6.7 | 6.5 | 7.0 | 6.9 | 6.7 | 6.8 | 6.4 | 5.3 | 6.5 | 5.6 | 5.7 | 6.9 | 8.4 | 13.7 | 7.9 | 8.5 | 10.3 | 29.3 | 9.0 | 8.5 | 8.8 | 8.8 | 8.2 | 9.7 | 11.5 | 4.3 | 14.8 | 158.7 | 6.9 | 10.1 | 8.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 142 | 132 | 111 | 100 | 48 | 108 | 90 | 119 | 110 | 125 | 47 | 109 | 113 | 105 | 86 | 85 | 79 | 84 | 82 | 78 | 81 | 76 | 65 | 67 | 60 | 59 | 57 | 64 | 97 | 61 | 64 | 72 | 179 | 65 | 59 | 59 | 59 | 56 | 62 | 68 | 32 | 91 | 789 | 41 | 57 | 50 |
| Percentage of ProfitLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 11.0 | 10.8 | 9.2 | 8.5 | 4.5 | 9.2 | 7.6 | 10.3 | 9.8 | 11.1 | 4.4 | 10.2 | 10.6 | 10.1 | 8.6 | 8.7 | 8.2 | 8.8 | 8.6 | 8.4 | 8.8 | 8.4 | 7.5 | 8.7 | 7.9 | 8.0 | 9.4 | 10.9 | 16.2 | 10.4 | 11.2 | 12.8 | 31.7 | 11.5 | 10.7 | 11.2 | 11.2 | 10.5 | 12.1 | 13.7 | 6.4 | 17.0 | 160.9 | 9.1 | 12.3 | 10.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 12 | 2.8 | 4.2 | 8.3 | 9.9 | 7.1 | 27 | 21 | 45 | 19 | 20 | 18 | 21 | 26 | 9.8 | 9.2 | 20 | 8.0 | 10.0 | 4.3 | 8.6 | 4.5 | 4.4 | 6.2 | 6.2 | 9.4 | 4.6 | 5.0 | 7.0 | 7.3 | 5.8 | 6.2 | 6.5 | 6.3 | 6.0 | 6.1 | 5.9 | 6.1 | 5.9 | 4.9 | 5.3 | 4.2 | 5.2 | 3.4 | 4.0 | 3.8 |
| Percentage of ShareBasedCompensation | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -226.0 | -95.6 | -142.7 | -89.7 | -92.1 | -83.0 | -145.7 | -320.1 | -100.1 | -91.5 | -98.2 | -65.3 | -200.4 | -60.6 | -75.3 | -77.6 | -77.8 | -53.8 | -88.7 | -50.8 | -66.0 | -39.5 | -950.4 | -52.7 | -81.0 | -45.7 | -714.6 | -55.3 | -39.2 | -67.8 | -29.0 | -95.8 | -53.5 | -47.9 | -54.5 | -36.0 | -55.4 | -32.9 | -57.3 | 81 | -25.8 | -23.4 | -35.1 | -50.7 | -13.9 | -26.2 |
| Percentage of NetCashProvidedByUsedInInvestingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -17.6 | -7.8 | -11.8 | -7.6 | -8.6 | -7.0 | -12.3 | -27.6 | -8.8 | -8.1 | -9.0 | -6.1 | -18.8 | -5.8 | -7.5 | -7.9 | -8.1 | -5.6 | -9.3 | -5.5 | -7.2 | -4.3 | -108.1 | -6.8 | -10.6 | -6.2 | -116.5 | -9.3 | -6.5 | -11.5 | -5.1 | -17.0 | -9.5 | -8.4 | -9.9 | -6.7 | -10.4 | -6.1 | -11.1 | 16.5 | -5.1 | -4.3 | -7.2 | -11.0 | -3.0 | -5.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 113 | 98 | 139 | 89 | 83 | 83 | 112 | 104 | 83 | 72 | 83 | 62 | 48 | 59 | 70 | 55 | 58 | 41 | 63 | 42 | 40 | 31 | 43 | 38 | 28 | 17 | 37 | 44 | 32 | 56 | 28 | 97 | 38 | 30 | 28 | 29 | 55 | 27 | 38 | 26 | 20 | 15 | 22 | 19 | 15 | 14 |
| Percentage of PaymentsToAcquirePropertyPlantAndEquipment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 2.2 | 0.9 | 1.0 | 0.5 | 0.6 | 1.5 | 1.6 | 3.1 | 3.5 | 4.5 | 3.9 | 1.7 | 4.3 | 1.7 | 5.1 | 1.7 | 2.2 | 1.7 |
| Percentage of PaymentsToAcquireProductiveAssets | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 120 | 99 | 141 | 90 | 88 | 83 | 125 | 103 | 92 | 70 | 83 | 64 | 54 | 62 | 73 | 59 | 62 | 43 |
| Percentage of PaymentsToAcquireProductiveAssets | 5472.7 | 11088.9 | 14200.0 | 18080.0 | 14816.7 | 5553.3 | 7837.5 | 3341.9 | 2628.6 | 1564.4 | 2141.0 | 3794.1 | 1265.1 | 3658.8 | 1437.3 | 3476.5 | 2845.5 | 2535.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -186.39999999999998 | -77.5 | -354.2 | -45.6 | 182 | 71 | -424.1 | 431 | 122 | -81.7 | -67.7 | -137.0 | 0.2 | -116.7 | -89.3 | -99.7 | -63.5 | -106.3 | -63.2 | -120.7 | -89.1 | -108.6 | 93 | 645 | -184.7 | 85 | 438 | 122 | -76.1 | -50.7 | -72.4 | -50.5 | -63.3 | -126.2 | -85.2 | 50 | -61.7 | -33.9 | -92.2 | -148.4 | -122.7 | 26 | -174.1 | -22.2 | -18.7 | -22.7 |
| Percentage of NetCashProvidedByUsedInFinancingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | -14.5 | -6.3 | -29.2 | -3.9 | 17.0 | 6.0 | -35.8 | 37.2 | 10.8 | -7.3 | -6.2 | -12.8 | 0.0 | -11.2 | -8.9 | -10.2 | -6.6 | -11.1 | -6.7 | -13.0 | -9.7 | -11.9 | 10.7 | 82.9 | -24.2 | 11.5 | 71.5 | 20.5 | -12.6 | -8.6 | -12.7 | -9.0 | -11.2 | -22.0 | -15.4 | 9.5 | -11.6 | -6.3 | -17.8 | -29.8 | -24.3 | 5.0 | -35.5 | -4.8 | -4.0 | -4.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 |
| Value | 27 | 29 | 27 | 27 | 27 | 29 | 27 | 26 | 26 | 28 | 26 | 24 | 24 | 25 | 24 | 23 | 21 | 22 | 21 | 20 | 20 | 21 | 20 | 19 | 18 | 18 | 18 | 15 | 15 | 15 | 15 | 0.0 | 0.0 | 0.0 |
| Percentage of PaymentsOfDividendsCommonStock | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 |
| Value | 1.2 | 0.0 | 0.0 | 2.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 20 | 0.0 | 18 | 41 | 0.0 | 11 | 12 | 45 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 16 | 26 | 0.0 | 0.0 | 1.5 | 232 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of PaymentsForRepurchaseOfCommonStock | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 628000.0 | 565000.0 | 537000.0 | 557000.0 | 1575000.0 | 2056000.0 | 2207000.0 | 2361000.0 | 2575000.0 | 2439000.0 | 2493000.0 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 50.65 | 43.02 | 35.22 | 30.53 | 21.45 | 21.37 | 20.85 | 20.82 | 21.12 | 21.63 | 22.36 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-05-31 | 2019-02-28 | 2018-02-23 | 2018-05-31 | 2017-05-31 | 2017-02-28 |
| Value | 0 | 500000.0 | 155000.0 | 0 | 0 | 400000.0 | 500000.0 | 400000.0 | 500000.0 | 500000.0 | 600000.0 | 600000.0 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-05-31 | 2019-02-28 | 2018-02-23 | 2018-05-31 | 2017-05-31 | 2017-02-28 |
| Value | 0 | 200000.0 | 0 | 0 | 200000.0 | 200000.0 | 100000.0 | 200000.0 | 200000.0 | 200000.0 | 200000.0 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 0.0 | 40.0 | 0.0 | 0.0 | 50.0 | 40.0 | 25.0 | 40.0 | 40.0 | 33.3 | 33.3 |
| Period End | 2020-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 51 | 148 | 134 | 60 | 26 | 20 | 0.2 |
| Percentage of DeferredTaxLiabilities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 127 | 173 | 146 | 181 | 228 | 339 | 452 | 553 | 557 | 655 | 707 |
| Percentage of DeferredTaxAssetsNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2010-12-31 | 2009-12-31 | 2008-12-31 |
| Value | 0.2 | 0.4 | 0.4 | 0.6 | 0.9 | 0.9 | 0.9 | 1.1 | 1.1 | 0.3 | 0.3 | 0.3 | 0.3 | 2.8 | 2.8 | 2.8 | 3.0 | 2.9 | 2.4 | 2.4 | 2.4 | 0.9 | 0.4 | 0.4 | 1.1 | 1.1 | 3.0 | 2.4 | 116 | 78 | 79 | 79 | 6.1 | 6.0 | 8.0 | 8.5 | 12 | 50 | 61 |
| Percentage of UnrecognizedTaxBenefits | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2010-12-31 |
| Value | 46 | 38 | 33 | 35 | 27 | 27 | 23 | 30 | 39 | 50 | 105 | 106 | 113 |
| Percentage of DeferredTaxAssetsValuationAllowance | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 315 | 285 | 273 | 261 | 195 | 256 | 274 | 261 | 283 | 276 | 255 | 256 | 265 | 257 | 241 | 235 | 241 | 229 |
| Percentage of AdjustedEBITDA | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 61 | 50 | 55 | 51 | 15 | 41 | 49 | 50 | 49 | 46 | 44 | 43 | 41 | 33 | 34 | 34 | 32 | 23 |
| Percentage of AdjustedEBITDA | 19.5 | 17.8 | 20.3 | 19.8 | 7.7 | 16.0 | 18.1 | 19.4 | 17.3 | 16.8 | 17.2 | 16.9 | 15.7 | 13.0 | 14.2 | 14.8 | 13.6 | 10.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 254 | 234 | 218 | 209 | 180 | 215 | 225 | 210 | 233 | 230 | 211 | 212 | 223 | 223 | 207 | 200 | 208 | 205 |
| Percentage of AdjustedEBITDA | 80.5 | 82.2 | 79.7 | 80.2 | 92.3 | 84.0 | 81.9 | 80.6 | 82.7 | 83.2 | 82.8 | 83.1 | 84.3 | 87.0 | 85.8 | 85.2 | 86.4 | 89.6 |
| Period End | 2021-06-30 |
| Value | 1.6 |
| Percentage of BusinessCombinationNoncontrollingInterestFairValue | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2019-09-30 | 2019-06-30 |
| Value | 21 | -8.0 | 5.1 | 0.0 |
| Percentage of BusinessCombinationNoncontrollingInterestFairValue | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2020-06-30 |
| Value | 3.2 | 8.0 |
| Percentage of BusinessCombinationNoncontrollingInterestFairValue | 200.0 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2017-12-31 |
| Value | 0 | 0 | 0 | 3100000.0 | 0 | 1000000.0 | 0 | 0 | 9600000.0 | 0 |
| Percentage of Contributiontojointventure | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 |
| Value | 122 | 118 | 121 | 121 | 136 | 130 | 133 | 136 | 119 | 116 | 116 | 114 | 109 | 98 |
| Percentage of CostofServicesExcludingDepreciationandAmortization | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 113 | 106 | 85 | 77 | 33 | 86 | 67 | 97 | 91 | 102 | 26 | 88 | 91 | 84 | 60 | 65 | 62 | 66 |
| Percentage of IncomeLossFromContinuingOperationsAttributableToCommonShareholdersBasic | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 26 | 88 | 91 | 84 | 60 | 66 | 71 | 69 |
| Percentage of IncomeLossFromContinuingOperationsAttributableToCommonShareholdersDiluted | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 112 | 106 | 85 | 77 | 33 | 86 | 67 | 97 | 90 | 101 | 28 | 88 | 91 | 83 | 60 | 65 | 62 | 66 |
| Percentage of NetIncomeLossAvailabletoCommonStockholders | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-06-30 | 2019-03-31 |
| Value | 0.0 | 0.0 | 0.0 | 46 | 0.0 | 0.0 |
| Percentage of NoncontrollingInterestExchangeTransaction | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 21 | 20 | 19 | 19 | 19 | 18 | 18 | 18 | 17 |
| Percentage of OccupancyCost | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 17 | 16 | 15 | 16 | 15 | 16 | 15 | 15 | 15 | 15 | 15 |
| Percentage of OccupancyCost | 74.3 | 74.8 | 75.5 | 75.4 | 75.9 | 75.7 | 76.2 | 78.0 | 80.3 | 80.6 | 0.0 | 81.1 | 82.1 | 83.3 | 0.0 | 84.4 | 84.7 | 84.4 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 |
| Value | 0 | 0 | 0 | 1500000.0 | 0 | 800000.0 | 0 | -200000.0 | 0 | 0 | 0 | 0 |
| Percentage of PayrolltaxesonSARsexercise | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 |
| Value | 0.8 | 15 | 0.0 | 0.0 | 0.1 | 15 | 0.4 | 0.1 | 0.2 | 15 | 0.0 | 0.0 | 0.0 | 8.3 | 0.0 | 0.0 | 12 | 6.9 | 1.7 | 0.0 | 0.0 | 9.9 | 0.0 |
| Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 |
| Value | 0.8 | 15 | 0.0 | 0.0 | 0.1 | 15 | 0.4 | 0.1 | 0.2 | 15 | 0.0 | 0.0 | 0.0 | 8.3 | 0.0 | 0.0 | 12 | 6.9 | 1.7 | 0.0 | 0.0 | 9.9 | 0.0 |
| Percentage of AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 113 | 25 | 168 | 73 | 174 | -79.5 | 125 | -5.1 | 34 | 34 | 132 | 89 | 56 | 110 | 64 | 88 | 72 | 96 | 34 | 99 | 70 | 82 | 51 | 95 | 41 | 42 | 15 | 73 | 33 | 45 | 36 | 69 | -73.5 | 55 | 51 | 46 | 57 | 23 | 64 | 20 | 40 | 12 | -731.3 | 52 | 38 | 31 |
| Percentage of AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2012-12-31 | 2012-09-30 | 2012-06-30 |
| Value | 113 | 86 | 77 | 33 | 67 | 97 | 91 | 102 | 31 | 89 | 93 | 84 | 90 | 65 | 63 | 66 | 62 | 62 | 58 | 50 | 42 | 42 | 55 | 50 | 85 | 46 | 48 | 58 | 165 | 46 | 47 | 46 |
| Percentage of BusinessAcquisitionsProFormaNetIncomeLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2012-12-31 | 2012-09-30 | 2012-06-30 |
| Value | 1295 | 1214 | 1173 | 1076 | 1184 | 1162 | 1135 | 1126 | 1194 | 1070 | 1075 | 1048 | 1064 | 996 | 982 | 975 | 929 | 921 | 910 | 778 | 770 | 741 | 988 | 596 | 616 | 592 | 572 | 564 | 564 | 557 | 542 | 539 |
| Percentage of BusinessAcquisitionsProFormaRevenue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 |
| Value | 0.5 |
| Percentage of BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 |
| Value | 0.0 | 0.0 | 0.0 | 2.2 | 0.0 | 19 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 0.0 | -0.1 | 0.0 | -0.1 | 0.2 | -0.1 | -1.5 | -3.0 | 1.5 | -0.1 | 0.1 | -0.7 | 0.1 | -0.1 | -0.2 | -0.4 | -0.1 | -0.1 | -0.3 | -0.2 | 0.1 | -0.5 | -0.2 | -0.1 | -0.2 | 0.2 | -1.0 | -0.2 | -0.5 | -1.2 | 0.5 | -0.7 | 0.5 | -0.2 | 1.3 | 0.4 | -0.3 | 2.2 | 8.6 | -1.4 | -15.1 | 3.1 | 9.5 | -2.2 |
| Percentage of CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 |
| Value | 103 | 101 | 103 | 100 | 98 | 100 | 103 | 99 | 89 | 88 | 88 | 82 | 80 | 72 | 73 | 68 | 67 |
| Percentage of CostOfGoodsAndServicesSoldOverhead | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 |
| Value | 28 | 27 | 27 | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 27 | 26 | 24 | 24 | 24 | 24 | 23 | 21 | 21 | 21 | 20 | 20 | 20 | 21 | 19 | 18 | 18 | 18 | 16 | 16 | 47 |
| Percentage of DividendsCommonStockCash | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 |
| Value | 28 | 27 | 27 | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 27 | 26 | 24 | 24 | 24 | 24 | 23 | 21 | 21 | 21 | 20 | 20 | 20 | 21 | 19 | 18 | 18 | 18 | 16 | 16 | 47 |
| Percentage of DividendsCommonStockCash | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 |
| Value | 11 |
| Percentage of FairValueOfAssetsAcquired | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2019-09-30 | 2019-06-30 |
| Value | 0.0 | 0.0 | 68 | 0.0 |
| Percentage of FairValueOfAssetsAcquired | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2019-09-30 | 2019-06-30 |
| Value | 0.0 | 1.4 | 0.5 | 0.0 |
| Percentage of FairValueOfAssetsAcquired | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2020-06-30 |
| Value | 0.8 | 1.4 |
| Percentage of FairValueOfAssetsAcquired | 6.7 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2018-09-30 |
| Value | 5.8 | 5.8 | 5.3 | 4.9 | 4.6 |
| Percentage of FinanceLeasePrincipalPayments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 |
| Value | -2900000.0 | 100000.0 | -1000000.0 | -7500000.0 | -3000000.0 | -100000.0 | -7800000.0 | -900000.0 | -1300000.0 | -1100000.0 | -3500000.0 | 1000000.0 | -2400000.0 | -800000.0 | -1300000.0 | -3000000.0 | -800000.0 | 500000.0 | 1300000.0 | -1600000.0 | -200000.0 | -200000.0 | -2400000.0 | -900000.0 |
| Percentage of GainLossOnSalesOfAssetsAndAssetImpairmentCharges | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 |
| Value | 90 |
| Percentage of GoodwillAcquiredDuringPeriod | 100.0 |
| Period End | 2021-06-30 | 2020-06-30 |
| Value | 3.5 | 6.6 |
| Percentage of GoodwillAcquiredDuringPeriod | 3.9 | 0.0 |
| Period End | 2021-06-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -0.3 | 0.1 | -0.1 | 0.0 | 0.0 | -0.1 | -0.5 | 1.5 | -0.1 | 0.2 | -0.5 | -0.2 | -0.1 | 0.2 | -0.3 | 0.3 | -0.1 | -0.1 | -0.1 | 0.7 | 0.3 | -1.6 | -0.3 | 2.7 | -0.9 | 3.8 | -0.1 | 0.1 | -0.9 | 0.1 | -0.4 | 1.9 | -0.5 | 3.5 | -0.4 | -5.0 | 34 | 1.6 | 14 | 1.3 | 3.2 | 3.3 | -3.1 |
| Percentage of IncomeLossFromDiscontinuedOperationsNetOfTax | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -0.3 | 0.1 | -0.1 | 0.0 | 0.0 | -0.1 | -0.5 | 1.5 | -0.1 | 0.2 | -0.5 | -0.2 | -0.1 | 0.2 | -0.3 | 0.3 | -0.1 | -0.1 | -0.1 | 0.7 | 0.3 | -1.6 | -0.3 | 2.7 | -0.9 | 3.8 | -0.1 | 0.1 | -0.9 | 0.1 | -0.4 | 1.9 | -0.5 | 3.5 | -0.4 | -5.0 | 34 | 2.5 | 14 | -8.7 | 3.4 | 3.4 | -3.1 |
| Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 1.0 | 1.0 | 1.0 | 1.0 | 0.7 | 0.8 | 1.2 | 1.2 | 1.8 | 2.5 | 2.3 | 2.1 | 2.0 | 2.3 | 1.8 | 2.1 | 2.0 | 2.1 | 2.5 | 2.5 | 2.4 | 2.4 | 2.4 | 2.4 | 2.3 | 1.6 | 1.9 | 1.9 | 2.6 | 4.3 | 3.0 | 2.0 | 3.3 | 2.9 | 3.0 | 3.3 | 3.1 | 3.3 | 3.2 | 3.1 | 3.2 | 2.5 | 2.6 | 2.3 | 2.6 | 2.6 |
| Percentage of IncomeLossFromEquityMethodInvestments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.4 | 0.4 | 0.3 | 0.2 | 0.4 | 0.3 | 0.1 | 0.2 | 0.2 | 0.2 |
| Percentage of IncomeLossFromEquityMethodInvestments | 20.0 | 20.0 | 10.0 | 10.0 | 14.3 | 25.0 | 16.7 | 16.7 | 22.2 | 16.0 | 13.0 | 9.5 | 20.0 | 13.0 | 5.6 | 9.5 | 10.0 | 9.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 0.8 | 0.8 | 0.9 | 0.9 | 0.6 | 0.6 | 1.0 | 1.0 | 1.4 | 2.1 | 2.0 | 1.9 | 1.6 | 2.0 | 1.7 | 1.9 | 1.8 | 1.9 |
| Percentage of IncomeLossFromEquityMethodInvestments | 80.0 | 80.0 | 90.0 | 90.0 | 85.7 | 75.0 | 83.3 | 83.3 | 77.8 | 84.0 | 87.0 | 90.5 | 80.0 | 87.0 | 94.4 | 90.5 | 90.0 | 90.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2012-06-30 | 2012-03-31 | 2011-06-30 | 2011-03-31 |
| Value | 21 | 5.7 | 5.3 | 28 | 82 | -24.0 | 34 | -13.3 | 7.1 | -14.8 | 21 | 3.9 | -1.1 | -9.5 | 21 | 3.6 | 2.5 | -3.0 | 11 | -10.5 | -11.6 | 20 | -1.5 | 7.0 | -0.3 | -23.3 | 3.7 | 6.5 | -3.8 | -11.3 | -1.5 | -14.3 | 2.5 | 1.8 |
| Percentage of IncreaseDecreaseInAccruedSalaries | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-09-30 |
| Value | 18 | -1.3 | 2.7 | -4.2 | -15.8 | -0.7 | 8.0 | 3.8 | -3.9 | 2.8 | -14.2 | -14.6 | 5.6 | 16 | 0.1 | 6.1 | -1.8 | 1.8 | 3.6 | 2.9 | -0.5 | -13.1 | 4.7 | 3.8 | 2.1 | -1.4 | 1.0 | 3.0 | 4.0 | 3.1 | -4.3 | 14 | 2.5 |
| Percentage of IncreaseDecreaseInOtherOperatingAssets | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 12 | -2.2 | 15 | -10.0 | 29 | -109.6 | -10.2 | -63.6 | -66.8 | 11 | -11.9 | 6.0 | -14.4 | 26 | -8.8 | 5.5 | -9.5 | 16 | 0.0 | 13 | -6.0 | 4.1 | -1.3 | 7.7 | -16.1 | 5.4 | -2.8 | 12 | -19.9 | -0.1 | 11 | -0.4 | -4.0 | -2.2 | 5.9 | -11.3 | -3.2 | 8.7 | 0.1 | -8.6 | 4.0 | 8.6 | -12.0 | 3.8 | 14 | 2.1 |
| Percentage of IncreaseDecreaseInOtherOperatingLiabilities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 |
| Value | 1200000.0 | 1200000.0 | 0 | 1200000.0 | 1200000.0 | 1400000.0 | 0 | 1600000.0 | 1300000.0 | 1300000.0 | 100000.0 | 2000000.0 | 1700000.0 | 1600000.0 | 200000.0 | 1200000.0 | 1100000.0 | 1600000.0 | 200000.0 | 1800000.0 | 1600000.0 | 1500000.0 | -400000.0 | 2500000.0 | 2700000.0 | 2600000.0 | -100000.0 | 2600000.0 | 2500000.0 | 2300000.0 | 400000.0 | 2600000.0 | 2100000.0 | 1500000.0 | 100000.0 | 1800000.0 |
| Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 |
| Value | 708 | 687 | 686 | 664 | 651 | 679 | 668 | 660 | 622 | 620 | 613 | 592 | 578 | 570 | 554 | 542 | 527 | 530 | 516 | 497 | 486 | 486 | 466 | 417 | 401 | 385 | 300 | 290 | 285 | 286 | 272 | 269 | 273 | 274 | 269 | 262 | 257 | 261 | 251 | 245 |
| Percentage of LaborAndRelatedExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 515 | 501 | 495 | 475 | 451 | 482 | 465 | 459 | 443 | 445 | 437 | 423 | 416 | 424 | 408 | 403 | 394 | 398 |
| Percentage of LaborAndRelatedExpense | 72.8 | 73.0 | 72.2 | 71.4 | 69.2 | 71.0 | 69.6 | 69.5 | 71.2 | 71.7 | 71.3 | 71.5 | 72.0 | 74.4 | 73.6 | 74.4 | 74.7 | 75.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 700000.0 | -100000.0 | 100000.0 | 400000.0 | 2400000.0 | -2500000.0 | 2000000.0 | 0 | -300000.0 | -900000.0 | 800000.0 | 100000.0 | 400000.0 | 600000.0 | 0 | 0 | 0 | 0 |
| Percentage of MarketableSecuritiesGainLoss | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 0.0 | 0.0 | 0.0 | 162 | 0.0 | 162 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 65 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of MinorityInterestDecreaseFromRedemptions | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 |
| Value | 26 | 23 | 24 | 20 | 13 | 19 | 20 | 18 | 17 | 18 | 16 | 16 | 17 | 18 | 17 | 15 | 13 | 14 | 13 | 12 | 15 | 14 | 15 | 13 | 13 | 13 | 14 | 12 | 13 | 12 | 13 | 12 | 12 | 13 | 11 | 11 | 12 | 11 |
| Percentage of NetIncomeLossAttributableToNonredeemableNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 |
| Value | 2.7 | 2.4 | 1.7 | 2.2 | 1.5 | 2.0 | 2.5 | 3.7 | 2.4 | 4.0 | 3.6 | 3.8 | 3.7 | 2.8 | 8.0 | 4.2 | 2.6 | 3.1 | 2.9 | 3.7 | 3.6 | 3.9 | 3.7 | 3.7 | 3.5 | 2.9 | 1.2 | 1.8 | 1.6 | 2.0 | 1.7 | 1.5 | 1.3 | 1.3 | 0.8 | 1.1 | 0.9 | 1.0 |
| Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 2.7 | 2.4 | 1.7 | 2.2 | 1.5 | 2.0 | 2.5 | 3.7 | 2.4 | 4.0 | 3.6 | 3.8 | 3.7 | 2.8 | 8.0 | 4.2 | 2.6 | 3.1 |
| Percentage of NetIncomeLossAttributableToRedeemableNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 |
| Value | 139 | 130 | 110 | 97 | 46 | 106 | 87 | 115 | 108 | 121 | 44 | 105 | 109 | 102 | 78 | 80 | 76 | 81 | 79 | 74 | 77 | 72 | 62 | 64 | 56 | 56 | 56 | 63 | 96 | 59 | 62 |
| Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 |
| Value | 26 | 23 | 24 | 20 | 13 | 19 | 20 | 18 | 17 | 18 | 16 | 16 | 17 | 18 | 17 | 15 | 13 | 14 | 13 | 12 | 15 | 14 | 15 |
| Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest | 18.7 | 17.7 | 21.8 | 20.6 | 28.4 | 18.5 | 22.9 | 15.7 | 15.9 | 15.6 | 36.3 | 16.0 | 16.2 | 18.2 | 22.8 | 18.5 | 18.0 | 17.8 | 17.6 | 17.1 | 19.3 | 20.3 | 24.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 |
| Value | 113 | 107 | 86 | 77 | 33 | 87 | 67 | 97 | 91 | 102 | 28 | 88 | 91 | 83 | 60 | 65 | 63 | 66 | 65 | 61 | 62 | 58 | 47 |
| Percentage of NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest | 81.3 | 82.3 | 78.2 | 79.4 | 71.6 | 81.5 | 77.1 | 84.3 | 84.1 | 84.4 | 63.7 | 84.0 | 83.8 | 81.8 | 77.2 | 81.5 | 82.0 | 82.2 | 82.4 | 82.9 | 80.7 | 79.7 | 75.7 |
| Period End | 2021-06-30 |
| Value | 2.7 |
| Percentage of NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 172 | 162 | 163 | 163 | 148 | 159 | 167 | 156 | 149 | 150 | 151 | 142 | 149 | 141 | 139 | 137 | 130 | 129 | 125 | 126 | 121 | 119 | 118 | 106 | 104 | 103 | 91 | 89 | 86 | 84 | 81 | 82 | 81 | 78 | 81 | 75 | 74 | 73 | 67 | 70 | 75 | 76 | 95 | 65 | 70 | 66 |
| Percentage of OtherCostAndExpenseOperating | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 147 | 140 | 140 | 135 | 124 | 134 | 135 | 131 | 127 | 127 | 128 | 124 | 126 | 122 | 120 | 117 | 112 | 111 |
| Percentage of OtherCostAndExpenseOperating | 85.4 | 86.3 | 86.0 | 82.9 | 83.8 | 84.4 | 81.3 | 83.8 | 84.9 | 85.0 | 84.6 | 87.0 | 84.9 | 87.0 | 86.3 | 85.3 | 86.5 | 86.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 |
| Value | -2000000.0 | -2000000.0 | 9600000.0 | -7700000.0 | -100000.0 | -7700000.0 | -5100000.0 | 1500000.0 | -4600000.0 | 800000.0 | 2300000.0 | -5100000.0 | -4800000.0 | -1600000.0 | 6400000.0 | -3400000.0 | -3900000.0 | -2500000.0 | 11600000.0 | -4800000.0 | -1000000.0 | -5900000.0 | 8800000.0 | 2800000.0 | -200000.0 | -10800000.0 | 8200000.0 | -6900000.0 | -3000000.0 | -3100000.0 | -3300000.0 | -5700000.0 | 500000.0 | -800000.0 | -5300000.0 | 5300000.0 | -1600000.0 | -1400000.0 | 4400000.0 | -800000.0 | -1900000.0 | -1100000.0 | 1300000.0 |
| Percentage of OtherNoncashIncomeExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2012-12-31 | 2012-09-30 |
| Value | 36 | 5.8 | 10 | 7.8 | 18 | 5.8 | 0.0 | 7.2 | 5.7 | 7.1 | 16 | 18 | 4.0 | 8.4 | 16 | 18 | 2.6 | 2.6 | 9.4 | 0.2 | 7.4 | 5.3 | 0.9 | 1.0 | 1.6 |
| Percentage of PartnersCapitalAccountContributions | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2012-12-31 | 2012-09-30 |
| Value | 36 | 5.8 | 10 | 7.8 | 18 | 5.8 | 0.0 | 7.2 | 5.7 | 7.1 | 16 | 18 | 4.0 | 8.4 | 16 | 18 | 2.6 | 2.6 | 9.4 | 0.2 | 7.4 | 5.3 | 0.9 | 1.0 | 1.6 |
| Percentage of PartnersCapitalAccountContributions | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 |
| Value | 4.4 | -3.2 | 0.3 | -1.2 | 4.6 | -1.6 | -4.9 | -4.1 | 10.0 | 5.5 | 3.0 | -0.9 | 6.6 | 0.1 | 10 | 3.4 | 1.1 | -12.1 | 4.2 | -0.6 | 0.8 | -2.8 | 4.6 | -7.9 | 3.8 | -3.2 | 0.1 | 7.1 | -13.6 | 4.2 | -2.1 | 0.4 | 2.5 | -1.3 | -1.9 | 1.0 | 2.0 | -0.2 | 0.2 | 0.2 | 0.8 | -0.3 | 0.3 | -0.1 |
| Percentage of PaymentsForProceedsFromOtherInvestingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2018-12-31 | 2018-09-30 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 |
| Value | 3.0 | 1.3 | 3.8 | 2.6 | 2.8 | 3.5 | 4.6 | 4.9 | 6.1 | 3.6 | 7.7 | 2.3 | 7.5 | 7.7 | 7.4 | 5.5 | 6.3 | 8.9 | 4.4 | 1.6 | 4.0 | 7.0 | 5.7 | 3.7 |
| Percentage of PaymentsForSoftware | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2012-09-30 | 2011-09-30 |
| Value | 6.8 | 6.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 17 | 0.2 | 13 | 3.4 | 3.1 | 0.0 | 0.0 | 1.4 | 7.0 | 8.5 |
| Percentage of PaymentsOfDebtIssuanceCosts | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 |
| Value | 0.0 | 0.0 | 0.0 | 162 | 0.0 | 162 |
| Percentage of PaymentsOfDistributionsToAffiliates | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 |
| Value | 0.7999999999999982 | 15 | 0.0 | 0.0 | 0.1 | 15 | 0.4 | 0.1 | 0.2 | 15 | 0.0 | 0.0 | 0.0 | 8.3 | 0.0 | 0.0 | 12 | 6.9 | 1.7 | 0.0 | 0.0 | 9.9 |
| Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 |
| Period End | 2021-04-30 |
| Value | 95 |
| Percentage of PaymentsToAcquireBusinessesGross | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2010-12-31 | 2010-09-30 |
| Value | 0.0 | 0.0 | 0.0 | 1.1 | 0.3 | 217 | 0.0 | 13 | 8.1 | 0.0 | 135 | 0.6 | 2.2 | 15 | 4.5 | 16 | 28 | 10 | 9.4 | 0.0 | 898 | 9.4 | 70 | 7.3 | 678 | 0.0 | 15 | 0.0 | 0.0 | 0.0 | 28 | 0.0 | 1.0 | 2.1 | 0.0 | 24 |
| Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 |
| Period End | 2021-06-30 |
| Value | 97 |
| Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2019-09-30 | 2019-06-30 |
| Value | 0.0 | 0.0 | 217 | 0.0 |
| Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired | 0.0 | 0.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 |
| Value | 1.1 |
| Percentage of PaymentsToAcquireBusinessesNetOfCashAcquired | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 |
| Value | 24 | 27 | 19 | 15 | 18 | 19 | 22 | 21 | 17 | 19 | 18 | 21 | 19 | 15 | 13 | 14 | 12 | 11 | 15 | 15 | 18 | 15 | 14 |
| Percentage of PaymentsToMinorityShareholders | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 |
| Value | 0 | 0 | -60300000.0 |
| Percentage of PriorPeriodReclassificationAdjustment | 0.0 | 0.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2018-12-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 |
| Value | 400 | 0.0 | 0.0 | 1000 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 700 | 0.0 | 700 | 0.0 | 175 | 0.0 | 0.0 | 0.0 | 0.0 | 275 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 120 |
| Percentage of ProceedsFromIssuanceOfSeniorLongTermDebt | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 |
| Value | 0.0 | 0.0 | 0.0 | 330 | 110 | 125 | 375 | 25 | 40 | 40 | 150 | 95 | 32 | 136 | 50 | 55 | 75 | 95 | 105 | 60 | 225 | 45 | 235 | 35 | 375 | 0.0 | 25 | 40 | 50 | 15 | 10.0 | 122 | 0.0 | 95 | 15 | 25 | 0.0 | 148 | 150 | 40 |
| Percentage of ProceedsFromLongTermLinesOfCredit | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 5.1 | -5.0 | -24.8 | 20 | 13 | -7.9 | -19.7 | 3.2 | 21 | -13.0 | 9.2 | 0.8 | 6.9 | -10.8 | -6.1 | 2.0 | 5.3 | -0.8 | 16 | -1.9 | -2.8 | -2.5 | 7.4 | -1.2 | -1.3 | 0.3 | 0.7 | -6.2 | 5.7 | 0.7 | 9.8 | -7.8 | -0.3 | 3.3 | 0.0 | 0.4 | 1.5 | -1.5 | 0.0 | 0.0 | 6.9 | -2.6 | 4.1 | 0.2 | 2.5 | -1.6 |
| Percentage of ProceedsFromPaymentsForOtherFinancingActivities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-11-30 | 2019-11-30 | 2019-06-07 | 2019-06-30 |
| Value | 300 | 404 | 102 | 102 |
| Percentage of RepaymentsOfDebt | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 |
| Value | 0.0 | 0.0 | 350 | 25 | 65 | 460 | 65 | 30 | 75 | 125 | 95 | 95 | 75 | 68 | 65 | 122 | 73 | 95 | 85 | 60 | 120 | 173 | 92 | 350 | 50 | 15 | 53 | 42 | 40 | 53 | 59 | 0.0 | 0.0 | 195 | 40 | 10.0 | 68 | 110 | 21 | 107 |
| Percentage of RepaymentsOfLongTermLinesOfCredit | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2019-12-31 | 2019-09-30 | 2018-12-31 | 2018-09-30 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 |
| Value | 703 | 3.7 | 403 | 3.7 | 4.5 | 7.0 | 112 | 7.0 | 6.4 | 82 | 56 | 56 |
| Percentage of RepaymentsOfSeniorDebt | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 |
| Value | 0 | 100000.0 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 |
| Value | 400000.0 | -200000.0 | 0 | 0 | 0 | 200000.0 | 0 | 0 | 0 | 300000.0 | 0 | 0 | 0 | 200000.0 | 0 | 0 | 700000.0 | 200000.0 | 100000.0 | 0 | 0 | 400000.0 | -100000.0 |
| Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2017-12-31 | 2017-09-30 | 2015-12-31 |
| Value | 0 | 0 | 0 | 600000.0 | 0 | 0 | 0 |
| Percentage of StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2017-12-31 | 2017-09-30 | 2015-12-31 |
| Value | 0.0 | 0.0 | 46 | 0.0 | 0.0 | 0.0 |
| Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2015-12-31 |
| Value | 0.0 | 0.0 | 27 | 0.0 |
| Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | 0.0 | 0.0 | 58.5 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2017-12-31 | 2017-09-30 |
| Value | 0.0 | 0.0 | 19 | 0.0 | 0.0 |
| Percentage of StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | 0.0 | 0.0 | 41.5 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-03-31 |
| Value | 2.3 | 0.2 | 2.6 | -0.1 | -0.3 | -2.1 | 1.3 | -0.1 | -1.3 | -13.6 | -3.4 | -2.5 | -0.7 | 0.1 | 6.7 | -4.7 | 0.0 | -1.6 | 0.3 | -2.4 | -0.2 | -2.5 | 0.1 | 0.7 | 1.3 | -1.4 | 3.0 | 0.1 | 0.0 | -0.2 | -5.2 | 0.1 | -3.0 | 4.9 | -0.7 | -0.9 | -1.1 | -1.5 | -0.6 | -1.5 | -1.0 | -0.8 | 1.7 | -1.4 |
| Percentage of StockholdersEquityOther | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | -14.0 | -1.1 | -4.5 | -0.4 | -4.3 | 1.1 | -0.4 | -2.2 | -2.8 | -3.1 | -2.7 | -1.0 | -0.3 | -0.8 | -5.1 | -0.4 | -0.2 | -1.6 | -0.7 | -0.5 | -1.2 | -0.2 | -1.0 | 0.2 | -0.8 | 2.2 | -0.6 | 0.0 | -0.3 | -10.6 | 0.1 | -0.7 | 5.1 | 0.7 | 0.7 | 1.1 | -0.2 | 7.2 | -2.0 | 1.4 | 0.3 | 2.9 | -0.1 | -0.2 | 0.6 |
| Percentage of StockholdersEquityOther | -608.7 | -550.0 | -173.1 | 400.0 | 1433.3 | 84.6 | 400.0 | 169.2 | 20.6 | 91.2 | 108.0 | 142.9 | -300.0 | -11.9 | 108.5 | 0.0 | 12.5 | -533.3 | 29.2 | 250.0 | 48.0 | -200.0 | -142.9 | 15.4 | 57.1 | 73.3 | -600.0 | 0.0 | 150.0 | 203.8 | 100.0 | 23.3 | 104.1 | -100.0 | -77.8 | -100.0 | 13.3 | -1200.0 | 133.3 | -140.0 | -37.5 | 170.6 | 0.0 | 0.0 | -42.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2013-12-31 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 12 | 0.6 | 6.0 | -0.1 | 3.3 | -2.4 | 0.0 | -0.1 | 0.0 | -11.2 | -0.5 | 0.0 | 0.0 | 0.0 | 6.8 | 0.0 | 0.0 | 0.0 | 0.1 | -1.9 | 0.1 | -1.4 | 0.0 | 0.0 | 0.7 | -0.6 | -0.1 | 0.0 | -0.1 | 0.0 | -0.9 | -1.2 | -0.8 | -1.0 | -0.8 | -1.2 | -0.8 | -1.0 | 3.1 | -0.3 | -0.1 | -0.3 |
| Percentage of StockholdersEquityOther | 556.5 | 300.0 | 230.8 | 100.0 | -1100.0 | 114.3 | 0.0 | 100.0 | -0.0 | 82.4 | 14.7 | -0.0 | -0.0 | 0.0 | 101.5 | -0.0 | 0.0 | -0.0 | 33.3 | 79.2 | -50.0 | 56.0 | 0.0 | 0.0 | 53.8 | 42.9 | -3.3 | 0.0 | 1.9 | 0.0 | 128.6 | 133.3 | 72.7 | 66.7 | 133.3 | 80.0 | 80.0 | 125.0 | 182.4 | 0.0 | 0.0 | 21.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-03-31 |
| Value | 3.5 | 0.7 | 1.1 | 0.4 | 0.7 | 0.3 | 0.2 | 0.4 | 0.9 | 0.4 | 0.2 | 0.2 | 0.3 | 0.4 | 0.3 | 0.4 | 0.3 | 0.1 | 1.6 | 0.1 | 0.4 | 0.2 | 0.2 | 1.1 | 0.4 | 0.1 | 0.5 | 0.5 | 0.0 | 0.2 | 2.4 | -0.2 | -0.5 | -0.3 | -0.5 | -0.4 | -1.4 | -0.3 | -4.5 | -0.8 | -1.6 | -0.1 | -1.7 |
| Percentage of StockholdersEquityOther | 152.2 | 350.0 | 42.3 | -400.0 | -233.3 | -14.3 | 15.4 | -400.0 | -69.2 | -2.9 | -5.9 | -8.0 | -42.9 | 400.0 | 4.5 | -8.5 | 0.0 | -6.2 | 533.3 | -4.2 | -200.0 | -8.0 | 200.0 | 157.1 | 30.8 | -7.1 | 16.7 | 500.0 | 0.0 | -100.0 | -46.2 | -200.0 | 16.7 | -6.1 | 71.4 | 44.4 | 127.3 | 20.0 | 750.0 | 53.3 | 160.0 | 12.5 | 121.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 |
| Value | -100000.0 | 400000.0 | -100000.0 | 0 | 0 | 500000.0 | -100000.0 | 100000.0 | 0 | 700000.0 | 0 | 0 | 100000.0 | 700000.0 | 0 | 0 | -100000.0 | 600000.0 | -100000.0 | -100000.0 | 100000.0 | 500000.0 | -100000.0 | 0 | 0 | 700000.0 | 0 | 0 | 0 | 900000.0 | 100000.0 | 0 | 0 | 800000.0 | 0 | 0 | 1100000.0 | 100000.0 | 1700000.0 | -1800000.0 | 1800000.0 | 100000.0 | -200000.0 |
| Percentage of StockholdersEquityOtherShares | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2012-06-30 | 2012-03-31 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2011-03-31 | 2010-12-31 | 2010-09-30 | 2010-06-30 | 2010-03-31 |
| Value | 50 | 51 | 51 | 52 | 50 | 45 | 43 | 42 | 41 | 40 | 40 | 38 | 39 | 39 | 38 | 36 | 37 | 37 | 35 | 34 | 34 | 35 | 34 | 31 | 31 | 31 | 29 | 26 | 27 | 27 | 27 | 25 | 26 | 26 | 26 | 23 | 25 | 26 | 26 | 24 | 26 | 29 | 41 | 24 | 25 | 28 |
| Percentage of SuppliesExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 |
| Value | 44 | 45 | 44 | 45 | 42 | 39 | 37 | 37 | 36 | 35 | 36 | 33 | 34 | 35 | 35 | 33 | 33 | 33 |
| Percentage of SuppliesExpense | 88.2 | 87.1 | 85.3 | 86.3 | 83.0 | 86.7 | 87.3 | 86.2 | 88.0 | 88.8 | 89.0 | 87.0 | 88.3 | 90.0 | 90.7 | 90.7 | 91.1 | 91.1 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 |
| Value | 0 | 0 | 0 | 100000.0 | 0 | 100000.0 | 500000.0 | 200000.0 | 0 | 400000.0 | 0 | 500000.0 | 1000000.0 | 0 | 300000.0 | 400000.0 | 0 | 0 | 500000.0 | 800000.0 | 18200000.0 | 0 | 0 | -9100000.0 |
| Percentage of TreasuryStockSharesAcquired | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 |
| Value | 1.2 | 0.0 | 0.0 | 4.9 | 0.0 | 2.1 | 32 | 11 | 0.0 | 20 | 0.0 | 18 | 41 | 0.0 | 11 | 12 |
| Percentage of TreasuryStockValueAcquiredCostMethod | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 |
| Value | 1.2 | 0.0 | 0.0 | 4.9 | 0.0 | 2.1 | 32 | 11 | 0.0 | 20 | 0.0 | 18 | 41 | 0.0 | 11 | 12 |
| Percentage of TreasuryStockValueAcquiredCostMethod | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 0.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 |
| Value | 500000.0 | 500000.0 | 300000.0 | 300000.0 | 0 | 300000.0 | 200000.0 | 400000.0 | 300000.0 | 400000.0 | 0 | 300000.0 | 300000.0 | 300000.0 | 200000.0 | 200000.0 | 200000.0 | 200000.0 | 200000.0 | 200000.0 | -200000.0 | -200000.0 | -100000.0 | -300000.0 | -300000.0 | -300000.0 | -200000.0 | -500000.0 | -1100000.0 | -500000.0 | 700000.0 | -600000.0 |
| Percentage of UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | 15.0 | 75.0 | 0 | 74.25 |
| Percentage of VariableInterestEntityOwnershipPercentage | 100.0 | 100.0 | 0.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | 0 | 50.0 | 0 | 49.5 |
| Percentage of VariableInterestEntityOwnershipPercentage | 0.0 | 66.7 | 0.0 | 66.7 |
| Period End | 2020-12-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 |
| Value | 51.0 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 |
| Percentage of AffiliatesOwnershipPercentage | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 |
| Value | 8.0 | 0.08 | 0.08 | 0.08 | 0.19 | 0.19 | 0.01 | 0.01 |
| Percentage of AffiliatesOwnershipPercentage | 15.7 | 13.3 | 13.3 | 13.3 | 31.7 | 31.7 | 1.7 | 1.7 |
| Period End | 2021-06-01 |
| Value | 800000.0 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedPayroll | 100.0 |
| Period End | 2021-06-01 |
| Value | 300000.0 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseLiability | 100.0 |
| Period End | 2021-06-01 |
| Value | 900000.0 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingLeaseRightOfUseAssets | 100.0 |
| Period End | 2022-03-31 | 2021-12-31 | 2021-09-30 | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 4.25 | 5.0 | 5.5 | 6.0 | 6.5 | 6.5 | 5.5 | 4.75 |
| Percentage of DebtInstrumentCovenantLeverageRatio | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 22 | 30 |
| Percentage of DeferredTaxAssetsOperatingLeaseLiability | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 21 | 30 |
| Percentage of DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset | 100.0 | 100.0 |
| Period End | 2021-06-01 |
| Value | 40.0 |
| Percentage of EquityMethodInvestmentAdditionalOwnershipPercentage | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | -66100000.0 | -63600000.0 | -102700000.0 | -94500000.0 | -86000000.0 |
| Percentage of EquityMethodInvestmentsAccumulatedDividendsorDistributionsfromEquityMethodInvestments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 68 | 68 | 114 | 105 | 97 |
| Percentage of EquityMethodInvestmentsAccumulatedIncomeLossfromEquityMethodInvestments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 381 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearSixAndThereafter | 100.0 |
| Period End | 2020-12-31 |
| Value | 129 |
| Percentage of Financeleaserightofuseassetaccumulateddepreciation | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 383 | 235 | 195 | 178 | 159 |
| Percentage of InvestmentsCashandRestrictedCash | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 310 | 159 | 133 | 116 | 101 |
| Percentage of InvestmentsCashandRestrictedCash | 81.1 | 67.7 | 68.3 | 65.3 | 63.7 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 72 | 63 | 62 | 62 | 57 |
| Percentage of InvestmentsCashandRestrictedCash | 18.9 | 26.9 | 31.7 | 34.7 | 36.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 90.0 | 81.0 | 81.0 | 0.81 | 0.81 | 0.81 | 0.81 | 0.81 | 0.81 | 0.81 |
| Percentage of Jointventureownershippercentage | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 97.5 | 97.5 | 97.5 | 0.975 | 0.975 | 0.975 | 0.975 | 0.975 | 0.975 | 0.975 |
| Percentage of Jointventureownershippercentage | 108.3 | 120.4 | 120.4 | 120.4 | 120.4 | 120.4 | 120.4 | 120.4 | 120.4 | 120.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 50.0 | 50.0 | 50.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Percentage of Jointventureownershippercentage | 55.6 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 |
| Value | 50.0 | 50.0 | 50.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Percentage of Jointventureownershippercentage | 55.6 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 | 61.7 |
| Period End | 2020-12-31 |
| Value | 127 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearSixAndThereafter | 100.0 |
| Period End | 2020-12-31 |
| Value | 2273 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityAfterYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 2234 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityAfterYearFive | 98.3 |
| Period End | 2020-12-31 |
| Value | 384 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 380 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearFive | 99.0 |
| Period End | 2020-12-31 |
| Value | 252 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearFour | 100.0 |
| Period End | 2020-12-31 |
| Value | 251 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearFour | 99.4 |
| Period End | 2020-12-31 |
| Value | 38 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearOne | 100.0 |
| Period End | 2020-12-31 |
| Value | 38 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearOne | 100.0 |
| Period End | 2020-12-31 |
| Value | 337 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearThree | 100.0 |
| Period End | 2020-12-31 |
| Value | 335 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearThree | 99.4 |
| Period End | 2020-12-31 |
| Value | 49 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearTwo | 100.0 |
| Period End | 2020-12-31 |
| Value | 49 |
| Percentage of LongTermDebtAndLeaseObligationsMaturityYearTwo | 100.0 |
| Period End | 2020-12-31 |
| Value | 5000000.0 |
| Percentage of LossContingencyMinimumAmounttoConsiderAccruinganEstimateofRelatedLegalFees | 100.0 |
| Period End | 2020-12-31 |
| Value | 36 |
| Percentage of MaximumSelfInsuredRisk | 100.0 |
| Period End | 2020-09-30 |
| Value | 70.0 |
| Percentage of MedicareDenialsPercentageCollectedAfterAppealIncludingAdministrativeLawJudgeHearings | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 1600.0 | 1000.0 | 1000.0 | 1000.0 | 1000.0 |
| Percentage of NumberOfIndividualClaimsCoveredBySelfInsuredRiskReserves | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 400 |
| Percentage of RedeemableNoncontrollingInterestFairValueDeterminationBasedOnHomeHealthAcquisitionsValueThreshold | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 72 | 76 | 62 |
| Percentage of RestrictedDebtSecuritiesNoncurrent | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 6.0 |
| Percentage of RetirementInvestmentPlanCompanyMatchPercentageOfParticipantsContribution | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3.0 | 0.03 |
| Percentage of RetirementInvestmentPlanCompanyMatchVestingPercentage | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 400 |
| Percentage of SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueDeterminationBasedOnHomeHealthAcquisitionsValueThreshold | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 646 | 668 |
| Percentage of Totalleaseliabilities | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 568 | 603 |
| Percentage of Totaloperatingandfinanceleaseassets | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 9.8 | 7.4 | 7.8 | 12 | 11 | 7.2 | 13 | 12 | 18 | 11 | 9.7 |
| Percentage of AccountsAndOtherReceivablesNetCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 |
| Value | 696 | 658 | 623 | 601 | 569 | 507 |
| Percentage of AccountsReceivableNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 |
| Value | 123 | 152 | 155 | 129 | 125 | 96 |
| Percentage of AccountsReceivableNetNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 3.0 | 5.4 | 9.4 | 12 |
| Percentage of AvailableForSaleSecuritiesDebtSecurities | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 3.0 | 5.4 | 9.4 | 12 |
| Percentage of AvailableForSaleSecuritiesDebtSecurities | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 |
| Value | 75.0 |
| Percentage of BusinessAcquisitionPercentageOfVotingInterestsAcquired | 100.0 |
| Period End | 2021-04-30 |
| Value | 51.0 |
| Percentage of BusinessAcquisitionPercentageOfVotingInterestsAcquired | 0.0 |
| Period End | 2021-06-01 |
| Value | 102 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | 100.0 |
| Period End | 2021-06-30 |
| Value | 4.3 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets | 0.0 |
| Period End | 2021-06-01 |
| Value | 700000.0 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation | 100.0 |
| Period End | 2021-06-01 |
| Value | 0.8 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents | 100.0 |
| Period End | 2021-06-01 |
| Value | 200000.0 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets | 100.0 |
| Period End | 2021-06-01 |
| Value | 0.9 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables | 100.0 |
| Period End | 2021-06-01 |
| Value | 200000.0 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable | 100.0 |
| Period End | 2021-06-01 |
| Value | 0.7 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther | 100.0 |
| Period End | 2021-06-01 |
| Value | 2.7 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities | 100.0 |
| Period End | 2021-06-01 |
| Value | 98 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | 100.0 |
| Period End | 2021-06-30 |
| Value | 0.1 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets | 100.0 |
| Period End | 2021-06-01 |
| Value | 0.1 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment | 100.0 |
| Period End | 2020-09-30 |
| Value | 0.1 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment | 0.0 |
| Period End | 2021-06-01 |
| Value | 1.6 |
| Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest | 100.0 |
| Period End | 2020-10-31 |
| Value | 4.8 |
| Percentage of DebtInstrumentInterestRateEffectivePercentage | 100.0 |
| Period End | 2020-11-30 | 2012-09-11 |
| Value | 5.8 | 0.058 |
| Percentage of DebtInstrumentInterestRateEffectivePercentage | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 5.0 | 0.05 | 0.039 | 0.031 |
| Percentage of DebtInstrumentInterestRateEffectivePercentage | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 11.2 | 0.112 | 0.112 | 0.112 |
| Percentage of DebtInstrumentInterestRateEffectivePercentage | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 8.1 | 0.081 | 0.075 | 0.075 |
| Percentage of DebtInstrumentInterestRateEffectivePercentage | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 72 | 76 | 62 |
| Percentage of DebtSecuritiesAvailableForSaleRestricted | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 72 | 63 | 55 |
| Percentage of DebtSecuritiesAvailableForSaleRestricted | 100.0 | 83.4 | 89.7 |
| Period End | 2020-12-31 |
| Value | 200000.0 |
| Percentage of DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 7.5 | 11 | 1.5 | 2.9 | 22 | 42 | 40 | 42 | 82 | 75 | 68 | 63 | 91 | 102 | 35 | 75 | 72 | 190 |
| Percentage of DeferredIncomeTaxAssetsNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 0.5 | 0.7 |
| Percentage of DeferredIncomeTaxAssetsNet | 0.0 | 24.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 |
| Value | 178 | 170 | 103 | 117 | 152 | 148 |
| Percentage of DeferredIncomeTaxLiabilities | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 173 | 212 | 180 | 217 | 256 | 367 | 475 | 584 | 597 | 705 | 820 |
| Percentage of DeferredTaxAssetsGross | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 57 | 61 | 66 | 77 | 64 | 161 | 301 | 416 | 432 | 540 | 628 |
| Percentage of DeferredTaxAssetsOperatingLossCarryforwards | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 |
| Value | 100000.0 | 200000.0 | 600000.0 | 500000.0 | 800000.0 | 800000.0 | 1600000.0 | 2000000.0 | 400000.0 |
| Percentage of DeferredTaxAssetsOther | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 |
| Value | 6.6 | 33 | 30 | 36 | 52 | 48 |
| Percentage of DeferredTaxAssetsPropertyPlantAndEquipment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 |
| Value | 10 | 6.8 | 4.7 | 2.8 | 2.6 | 14 | 9.9 | 2.0 |
| Percentage of DeferredTaxAssetsTaxCreditCarryforwards | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 15 | 38 | 33 | 19 | 23 | 23 | 23 | 26 | 26 | 22 | 19 |
| Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 43 | 23 | 22 | 20 | 26 | 25 | 20 | 19 | 18 | 16 | 21 |
| Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 17 | 17 | 16 | 19 | 32 | 26 | 25 | 28 | 30 | 36 | 37 |
| Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 99 | 94 | 88 | 80 | 113 | 112 | 97 | 29 | 26 | 20 | 0.0 |
| Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 51 | 34 | 15 | 6.2 | 0.0 |
| Percentage of DeferredTaxLiabilitiesInvestments | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 400000.0 | 200000.0 | 200000.0 | 2500000.0 | 1600000.0 | 500000.0 | 5700000.0 | 3300000.0 | 300000.0 | 300000.0 | 200000.0 |
| Percentage of DeferredTaxLiabilitiesOther | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 5.7 | 11 | 0.0 | 28 | 0.0 |
| Percentage of DeferredTaxLiabilitiesTaxDeferredIncome | 100.0 | 100.0 | 0.0 | 100.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 253 | 210 | 188 | 172 | 147 | 126 | 123 | 90 | 85 | 85 | 80 | 77 |
| Percentage of EmployeeRelatedLiabilitiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 11 | 7.7 |
| Percentage of EmployeeRelatedLiabilitiesCurrent | 4.5 | 3.7 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 35 | 32 | 29 | 24 | 18 |
| Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 2100000.0 |
| Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 900000.0 | 900000.0 | 900000.0 | 900000.0 | 900000.0 | 900000.0 | 800000.0 | 2900000.0 | 2800000.0 | 7200000.0 | 7200000.0 |
| Percentage of EquityMethodInvestmentAggregateCost | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-01 |
| Value | 50.0 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 100.0 |
| Period End | 2021-06-01 |
| Value | 90.0 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 180.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 3.5 | 5.4 | 12 | 11 | 12 | 11 | 8.2 | 18 | 19 | 27 | 28 |
| Percentage of EquityMethodInvestments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-09-30 | 2019-06-30 |
| Value | 422 | 402 | 391 | 372 | 377 | 384 | 363 | 395 |
| Percentage of FinanceLeaseLiability | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 23 | 21 |
| Percentage of FinanceLeaseLiabilityCurrent | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 367 | 363 |
| Percentage of FinanceLeaseLiabilityNoncurrent | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 633 |
| Percentage of FinanceLeaseLiabilityPaymentsDue | 100.0 |
| Period End | 2020-12-31 |
| Value | 53 |
| Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths | 100.0 |
| Period End | 2020-12-31 |
| Value | 49 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 48 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearFour | 100.0 |
| Period End | 2020-12-31 |
| Value | 49 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearThree | 100.0 |
| Period End | 2020-12-31 |
| Value | 50 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo | 100.0 |
| Period End | 2020-12-31 |
| Value | 241 |
| Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 322 | 327 |
| Percentage of FinanceLeaseRightOfUseAsset | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 8.1 | 7.9 |
| Percentage of FinanceLeaseWeightedAverageDiscountRatePercent | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 406 | 346 | 288 | 305 | 255 | 208 | 172 | 152 | 135 | 125 | 109 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 54 | 40 | 28 | 19 | 12 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 13.4 | 11.7 | 9.8 | 6.4 | 5.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 11 | 11 | 10 | 10.0 | 9.5 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 2.8 | 3.2 | 3.6 | 3.3 | 3.7 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 |
| Value | 141 | 116 | 89 | 132 | 110 | 90 | 74 | 63 | 55 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 34.8 | 33.5 | 31.0 | 43.3 | 43.1 | 43.4 | 43.2 | 41.6 | 40.6 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 107 | 94 | 82 | 71 | 62 | 53 | 46 | 44 | 42 | 41 | 39 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 26.5 | 27.2 | 28.5 | 23.5 | 24.3 | 25.8 | 26.9 | 29.4 | 31.6 | 33.2 | 35.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 65 | 62 | 58 | 55 | 47 | 37 | 29 | 24 | 20 | 17 | 12 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 16.2 | 18.0 | 20.3 | 18.2 | 18.5 | 17.8 | 17.1 | 16.2 | 15.0 | 13.6 | 11.3 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 25 | 22 | 19 | 16 | 13 | 11 | 10 | 9.3 | 8.6 | 8.0 | 7.3 |
| Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization | 6.3 | 6.5 | 6.7 | 5.4 | 5.4 | 5.5 | 5.9 | 6.1 | 6.3 | 6.4 | 6.7 |
| Period End | 2020-12-31 |
| Value | 52 |
| Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths | 100.0 |
| Period End | 2020-12-31 |
| Value | 28 |
| Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 32 |
| Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour | 100.0 |
| Period End | 2020-12-31 |
| Value | 37 |
| Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree | 100.0 |
| Period End | 2020-12-31 |
| Value | 42 |
| Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 837 | 822 | 731 | 708 | 667 | 627 | 478 | 240 | 208 | 183 | 168 |
| Percentage of FiniteLivedIntangibleAssetsGross | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 197 | 197 | 148 | 113 | 98 |
| Percentage of FiniteLivedIntangibleAssetsGross | 23.6 | 24.0 | 20.3 | 16.1 | 14.8 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 |
| Value | 184 | 173 | 161 | 201 | 181 | 155 | 125 | 105 | 84 |
| Percentage of FiniteLivedIntangibleAssetsGross | 22.0 | 21.1 | 22.0 | 28.5 | 27.2 | 24.8 | 26.2 | 43.7 | 40.6 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 187 | 187 | 169 | 146 | 142 | 138 | 110 | 50 | 50 | 50 | 50 |
| Percentage of FiniteLivedIntangibleAssetsGross | 22.4 | 22.8 | 23.1 | 20.6 | 21.3 | 22.1 | 23.2 | 21.0 | 24.2 | 27.4 | 29.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 75 | 74 | 65 | 63 | 62 | 58 | 46 | 40 | 34 | 33 | 30 |
| Percentage of FiniteLivedIntangibleAssetsGross | 9.0 | 9.0 | 9.0 | 9.0 | 9.3 | 9.2 | 9.7 | 16.7 | 16.4 | 18.0 | 17.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 44 | 41 | 38 | 35 | 34 | 32 | 19 | 17 | 16 | 15 | 14 |
| Percentage of FiniteLivedIntangibleAssetsGross | 5.3 | 5.1 | 5.3 | 5.0 | 5.2 | 5.2 | 4.2 | 7.1 | 7.7 | 8.2 | 8.5 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 47 | 32 | 24 | 24 | 25 | 29 | 21 | 23 | 25 | 22 | 21 | 6.8 |
| Percentage of InterestPayableCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 58 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 36 | 38 | 37 | 35 | 33 |
| Percentage of LettersOfCreditOutstandingAmount | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 |
| Value | 165 | 157 | 160 | 171 | 171 | 142 | 134 | 140 |
| Percentage of LiabilityForClaimsAndClaimsAdjustmentExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 |
| Value | 136 | 130 | 135 | 131 | 130 | 115 | 108 | 107 |
| Percentage of LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 | 2012-09-30 | 2011-12-31 | 2011-09-30 | 2011-06-30 | 2010-12-31 | 2009-12-31 |
| Value | 66 | 137 | 38 | 37 | 36 | 40 | 39 | 437 | 38 | 37 | 35 | 37 | 36 | 32 | 32 | 31 | 38 | 37 | 37 | 36 | 36 | 36 | 36 | 23 | 21 | 149 | 20 | 208 | 12 | 13 | 11 | 12 | 13 | 79 | 18 | 19 | -18.4 | 14 | 21 |
| Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.8 |
| Percentage of LongTermDebtAndCapitalLeaseObligationsCurrent | 1.3 | 0.7 | 2.3 | 2.4 | 2.4 | 2.2 | 2.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 3334 | 3090 | 2529 | 2595 |
| Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 3288 | 3062 | 2514 | 2577 |
| Percentage of LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities | 98.6 | 99.1 | 99.4 | 99.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 38 | 37 | 36 | 36 | 36 | 36 | 38 | 38 | 39 | 39 | 37 | 39 | 38 | 37 | 35 | 35 | 34 | 36 | 33 | 33 | 34 |
| Percentage of LongTermDebtFairValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 45 | 0.0 | 350 | 45 | 0.0 | 335 | 25 | 30 | 65 | 150 | 95 | 95 | 138 | 70 | 85 | 152 | 150 | 130 |
| Percentage of LongTermDebtFairValue | 118.4 | 0.0 | 953.7 | 115.7 | 0.0 | 856.8 | 63.9 | 80.2 | 163.7 | 393.7 | 255.4 | 268.4 | 389.8 | 205.3 | 233.5 | 456.5 | 450.5 | 380.1 |
| Period End | 2021-06-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 45 | 0.0 | 350 | 45 | 0.0 | 335 | 25 | 30 | 65 | 150 | 95 | 95 | 138 | 70 | 85 | 152 | 150 | 130 |
| Percentage of LongTermDebtFairValue | 118.4 | 0.0 | 953.7 | 115.7 | 0.0 | 856.8 | 63.9 | 80.2 | 163.7 | 393.7 | 255.4 | 268.4 | 389.8 | 205.3 | 233.5 | 456.5 | 450.5 | 380.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2018-12-31 |
| Value | 783 | 783 | 783 | 782 | 782 | 491 | 491 | 491 | 0.0 |
| Percentage of LongTermDebtFairValue | 2062.9 | 2078.2 | 2134.1 | 2150.5 | 2155.6 | 1340.1 | 1264.0 | 1279.9 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2018-12-31 |
| Value | 851 | 824 | 856 | 814 | 771 | 496 | 520 | 506 | 0.0 |
| Percentage of LongTermDebtFairValue | 2239.5 | 2185.7 | 2332.4 | 2236.3 | 2124.5 | 1351.8 | 1336.8 | 1319.5 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 99 | 298 | 298 | 297 | 297 | 297 | 297 | 297 | 297 | 296 | 296 | 296 | 296 | 296 | 295 | 295 |
| Percentage of LongTermDebtFairValue | 261.8 | 791.2 | 812.3 | 818.4 | 820.1 | 810.6 | 764.3 | 774.0 | 759.6 | 759.1 | 793.0 | 746.6 | 777.7 | 796.0 | 835.9 | 886.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 100 | 300 | 302 | 302 | 301 | 298 | 306 | 306 | 305 | 305 | 298 | 302 | 303 | 304 | 306 | 297 |
| Percentage of LongTermDebtFairValue | 263.9 | 797.9 | 824.5 | 831.3 | 830.6 | 813.4 | 788.2 | 799.0 | 780.8 | 780.8 | 798.1 | 762.2 | 795.3 | 818.5 | 866.7 | 894.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 346 | 346 | 346 | 346 | 346 | 345 | 345 | 345 | 345 | 345 | 345 | 344 | 344 | 344 | 344 | 343 |
| Percentage of LongTermDebtFairValue | 912.1 | 919.1 | 943.6 | 950.8 | 953.2 | 942.2 | 888.4 | 899.7 | 883.1 | 882.9 | 922.5 | 868.8 | 904.7 | 926.3 | 972.9 | 1032.7 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 359 | 361 | 361 | 361 | 359 | 344 | 369 | 366 | 364 | 357 | 339 | 354 | 354 | 359 | 364 | 349 |
| Percentage of LongTermDebtFairValue | 946.6 | 959.2 | 984.7 | 992.9 | 990.9 | 938.1 | 950.4 | 954.7 | 933.2 | 915.3 | 907.8 | 894.0 | 931.5 | 965.6 | 1030.8 | 1049.8 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 697 | 697 | 697 | 697 | 1095 | 1095 | 1194 | 1194 | 1194 | 1194 | 1194 | 1193 | 1193 |
| Percentage of LongTermDebtFairValue | 1916.8 | 1921.8 | 1900.5 | 1792.5 | 2853.1 | 2801.8 | 3055.8 | 3194.4 | 3008.8 | 3134.6 | 3209.9 | 3372.6 | 3583.2 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 701 | 703 | 703 | 708 | 1115 | 1120 | 1221 | 1200 | 1216 | 1212 | 1221 | 1228 | 1216 |
| Percentage of LongTermDebtFairValue | 1927.2 | 1938.0 | 1916.9 | 1822.1 | 2905.2 | 2864.7 | 3122.8 | 3208.6 | 3064.0 | 3181.1 | 3282.3 | 3470.3 | 3653.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2018-12-31 |
| Value | 785 | 785 | 785 | 784 | 784 | 491 | 491 | 0.0 |
| Percentage of LongTermDebtFairValue | 2068.2 | 2083.6 | 2139.0 | 2155.5 | 2160.1 | 1340.3 | 1264.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2018-12-31 |
| Value | 831 | 820 | 840 | 804 | 770 | 491 | 519 | 0.0 |
| Percentage of LongTermDebtFairValue | 2187.4 | 2175.6 | 2288.8 | 2208.8 | 2121.2 | 1338.7 | 1335.2 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 393 | 393 | 393 |
| Percentage of LongTermDebtFairValue | 1035.3 | 1043.2 | 1071.4 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 429 | 415 | 424 |
| Percentage of LongTermDebtFairValue | 1130.8 | 1100.8 | 1157.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 245 | 248 | 251 | 254 | 258 | 261 | 265 | 269 | 272 | 276 | 280 | 283 | 287 | 291 | 294 | 421 |
| Percentage of LongTermDebtFairValue | 645.0 | 658.6 | 685.6 | 700.0 | 710.7 | 713.6 | 681.7 | 700.8 | 697.7 | 706.9 | 748.9 | 714.6 | 754.3 | 782.3 | 832.5 | 1264.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2016-12-31 |
| Value | 246 | 249 | 253 | 256 | 259 | 263 | 266 | 270 | 273 | 277 | 281 | 285 | 288 | 292 | 296 | 422 |
| Percentage of LongTermDebtFairValue | 648.4 | 662.6 | 689.6 | 704.7 | 716.0 | 717.4 | 685.3 | 703.1 | 700.3 | 709.7 | 752.1 | 717.9 | 758.0 | 786.3 | 837.0 | 1268.8 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 50 | 39 | 39 | 40 | 40 | 44 | 44 | 44 | 16 | 20 | 104 | 92 | 96 | 87 | 82 | 80 | 74 | 63 | 55 | 47 | 39 |
| Percentage of LongTermDebtFairValue | 132.1 | 105.3 | 108.4 | 110.4 | 111.3 | 121.3 | 114.9 | 116.9 | 43.2 | 53.2 | 278.6 | 231.7 | 252.8 | 236.3 | 232.5 | 226.3 | 217.3 | 173.4 | 167.6 | 141.4 | 114.6 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 50 | 39 | 39 | 40 | 40 | 44 | 44 | 44 | 16 | 20 | 104 | 92 | 96 | 87 | 82 | 80 | 74 | 63 | 55 | 47 | 39 |
| Percentage of LongTermDebtFairValue | 132.1 | 105.3 | 108.4 | 110.4 | 111.3 | 121.3 | 114.9 | 116.9 | 43.2 | 53.2 | 278.6 | 231.7 | 252.8 | 236.3 | 232.5 | 226.3 | 217.3 | 173.4 | 167.6 | 141.4 | 114.6 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 6.1 | 6.2 |
| Percentage of OperatingLeaseWeightedAverageDiscountRatePercent | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2016-12-31 |
| Value | 57 | 64 |
| Percentage of OperatingLossCarryforwards | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 9400000.0 |
| Percentage of OtherCommitmentDueAfterFifthYear | 100.0 |
| Period End | 2020-12-31 |
| Value | 5800000.0 |
| Percentage of OtherCommitmentDueInFifthYear | 100.0 |
| Period End | 2020-12-31 |
| Value | 12 |
| Percentage of OtherCommitmentDueInFourthYear | 100.0 |
| Period End | 2020-12-31 |
| Value | 55 |
| Percentage of OtherCommitmentDueInNextTwelveMonths | 100.0 |
| Period End | 2020-12-31 |
| Value | 25 |
| Percentage of OtherCommitmentDueInSecondYear | 100.0 |
| Period End | 2020-12-31 |
| Value | 17 |
| Percentage of OtherCommitmentDueInThirdYear | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 1374 | 1211 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 |
| Value | 2391 | 2280 | 2206 | 1959 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 |
| Value | 117 | 118 | 121 | 122 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | 4.9 | 5.2 | 5.5 | 6.3 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 2004 | 1771 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | 90.8 | 90.4 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 202 | 187 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | 9.2 | 9.6 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3378 | 2983 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 2357 | 2084 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 69.8 | 69.9 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 537 | 505 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 15.9 | 16.9 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 217 | 169 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 6.4 | 5.7 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 232 | 192 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 6.9 | 6.5 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 33 | 31 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 1.0 | 1.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 | 2014-12-31 | 2014-09-30 | 2014-06-30 | 2014-03-31 | 2013-12-31 | 2013-09-30 | 2013-06-30 | 2013-03-31 | 2012-12-31 |
| Value | 32 | 31 | 31 | 34 | 33 | 34 | 239 | 210 | 352 | 273 | 261 | 236 | 223 | 198 | 220 | 221 | 216 | 153 | 138 | 109 | 120 | 96 | 121 | 114 | 98 | 84 | 84 | 12 | 12 | 13 | 13 | 13 | 14 | 13 | 7.2 |
| Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 |
| Value | 32 | 31 | 31 | 34 | 33 | 34 | 239 | 210 | 352 | 273 | 261 | 236 | 223 | 198 | 220 | 221 | 216 | 153 | 138 | 121 | 84 |
| Percentage of RedeemableNoncontrollingInterestEquityCarryingAmount | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 32 | 31 | 31 | 239 | 261 |
| Percentage of RedeemableNoncontrollingInterestEquityFairValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 34 | 33 | 34 | 239 | 210 | 352 | 273 | 261 | 236 | 223 | 198 | 220 | 221 | 216 | 153 | 138 | 109 | 121 |
| Percentage of RedeemableNoncontrollingInterestEquityFairValue | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 32 | 31 | 31 | 239 | 261 |
| Percentage of RedeemableNoncontrollingInterestEquityFairValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2016-09-30 | 2015-12-31 |
| Value | 34 | 33 | 34 | 239 | 210 | 352 | 273 | 261 | 236 | 223 | 198 | 220 | 221 | 216 | 153 | 138 | 109 | 121 |
| Percentage of RedeemableNoncontrollingInterestEquityFairValue | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 |
| Value | 28 | 26 | 25 | 39 | 41 | 26 | 26 | 32 |
| Percentage of ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 86 | 64 | 64 | 62 |
| Percentage of RestrictedCashAndCashEquivalents | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 86 | 64 | 64 | 62 |
| Percentage of RestrictedCashAndCashEquivalents | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 | 2009-12-31 |
| Value | 65 | 57 | 59 | 62 | 60 | 45 | 45 | 52 | 49 | 35 | 36 | 67 |
| Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 17 | 16 | 16 | 18 | 22 |
| Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue | 26.8 | 27.9 | 27.8 | 29.0 | 37.6 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 |
| Value | 47 | 41 | 42 | 44 | 38 |
| Percentage of RestrictedCashAndCashEquivalentsAtCarryingValue | 73.2 | 72.1 | 72.2 | 71.0 | 62.4 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 86 | 64 | 64 | 62 |
| Percentage of RestrictedCashAndCashEquivalentsNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 21 | 7.4 | 5.3 | 0.0 |
| Percentage of RestrictedCashAndCashEquivalentsNoncurrent | 24.7 | 11.4 | 8.2 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2017-06-30 | 2017-03-31 | 2016-12-31 | 2015-12-31 |
| Value | 65 | 62 | 65 | 57 | 56 | 56 | 57 | 66 | 56 | 59 | 59 | 62 | 65 | 69 | 62 | 70 | 73 | 65 | 60 | 45 |
| Percentage of RestrictedCashCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2016-12-31 |
| Value | 1.6 | 10 | 21 | 20 | 14 | 15 | 7.4 | 25 | 9.2 | 5.1 | 5.3 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of RestrictedCashNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 44 | 40 | 41 | 60 | 61 | 40 | 35 | 42 | 41 | 50 | 50 |
| Percentage of SelfInsuranceReserveCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 | 2010-12-31 |
| Value | 121 | 117 | 119 | 110 | 110 | 101 | 98 | 98 | 106 | 102 | 102 |
| Percentage of SelfInsuranceReserveNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 |
| Value | 731000.0 | 818000.0 | 907000.0 | 673000.0 | 618000.0 | 842000.0 | 1197000.0 | 1162000.0 | 1048000.0 | 1889000.0 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 | 2016-12-31 | 2015-12-31 | 2014-12-31 | 2013-12-31 | 2012-12-31 | 2011-12-31 |
| Value | 61.75 | 49.49 | 37.61 | 40.9 | 35.06 | 28.05 | 23.31 | 22.89 | 19.28 | 8.23 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 413000.0 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | 100.0 |
| Period End | 2020-12-31 |
| Value | 41.1 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice | 100.0 |
| Period End | 2020-12-31 |
| Value | 20 |
| Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue | 100.0 |
| Period End | 2020-12-31 | 2012-12-31 |
| Value | 17 | 5.7 |
| Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 | 100.0 | 100.0 |
