| 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 |
|---|
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Cost Ratio shlx:AssetAcquisition shlx:April2020Acquisition | NA | NA | NA | 22.0 | NA | NA | NA | NA | NA | |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Amberjack,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▅▆▁▅▇█ | 70.0 | 72.0 | 61.0 | 69.0 | 74.0 | 76.0 | NA | 80.0 | 74.0 |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Bengal,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▂▃█▄▆ | 12.0 | 13.0 | 14.0 | 19.0 | 15.0 | 17.0 | NA | 22.0 | 19.0 |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Colonial,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▂▁▃▃▅█ | 306.0 | 290.0 | 327.0 | 319.0 | 348.0 | 401.0 | NA | 354.0 | 88.0 |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Explorer,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | █▁▂▂▂▄ | 139.0 | 69.0 | 78.0 | 75.0 | 80.0 | 96.0 | NA | 122.0 | 37.0 |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Mars,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▄▁▆▂█ | 58.0 | 63.0 | 58.0 | 68.0 | 61.0 | 72.0 | NA | 82.0 | 67.0 |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:OtherInvestment,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▆▁▁██ | 53.0 | 56.0 | 53.0 | 53.0 | 57.0 | 57.0 | NA | 44.0 | 56.0 |
| Cost Ratio us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Poseidon,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▃▆█▃▁▂ | 34.0 | 42.0 | 48.0 | 36.0 | 30.0 | 33.0 | NA | 31.0 | 34.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Amberjack,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▅▆▁▅▇█ | 70.0 | 72.0 | 61.0 | 69.0 | 74.0 | 76.0 | NA | 80.0 | 74.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Bengal,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▂▃█▄▆ | 12.0 | 13.0 | 14.0 | 19.0 | 15.0 | 17.0 | NA | 22.0 | 19.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Colonial,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▂▁▃▃▅█ | 306.0 | 290.0 | 327.0 | 319.0 | 348.0 | 401.0 | NA | 354.0 | 88.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Explorer,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | █▁▂▂▂▄ | 139.0 | 69.0 | 78.0 | 75.0 | 80.0 | 96.0 | NA | 122.0 | 37.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Mars,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▄▁▆▂█ | 58.0 | 63.0 | 58.0 | 68.0 | 61.0 | 72.0 | NA | 82.0 | 67.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:OtherInvestment,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▆▁▁██ | 53.0 | 56.0 | 53.0 | 53.0 | 57.0 | 57.0 | NA | 44.0 | 56.0 |
| Net profit Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Poseidon,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▃▆█▃▁▂ | 34.0 | 42.0 | 48.0 | 36.0 | 30.0 | 33.0 | NA | 31.0 | 34.0 |
| Operating Margin shlx:AssetAcquisition shlx:April2020Acquisition | NA | NA | NA | 22.0 | NA | NA | NA | NA | NA | |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Amberjack,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▅▆▁▅▇█ | 70.0 | 72.0 | 61.0 | 69.0 | 74.0 | 76.0 | NA | 80.0 | 74.0 |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Bengal,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▂▃█▄▆ | 12.0 | 13.0 | 14.0 | 19.0 | 15.0 | 17.0 | NA | 22.0 | 19.0 |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Colonial,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▂▁▃▃▅█ | 306.0 | 290.0 | 327.0 | 319.0 | 348.0 | 401.0 | NA | 354.0 | 88.0 |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Explorer,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | █▁▂▂▂▄ | 139.0 | 69.0 | 78.0 | 75.0 | 80.0 | 96.0 | NA | 122.0 | 37.0 |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Mars,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▄▁▆▂█ | 58.0 | 63.0 | 58.0 | 68.0 | 61.0 | 72.0 | NA | 82.0 | 67.0 |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:OtherInvestment,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▁▆▁▁██ | 53.0 | 56.0 | 53.0 | 53.0 | 57.0 | 57.0 | NA | 44.0 | 56.0 |
| Operating Margin us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName,us-gaap:EquityMethodInvestmentNonconsolidatedInvestee shlx:Poseidon,us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | ▃▆█▃▁▂ | 34.0 | 42.0 | 48.0 | 36.0 | 30.0 | 33.0 | NA | 31.0 | 34.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| TTM Greenblatt ROC _ _ | ██▄▁▂▃▅▄▄ | 65.0 | 64.0 | 48.0 | 35.0 | 41.0 | 45.0 | 53.0 | 49.0 | 48.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:ComprehensiveIncomeNetOfTax | ██▃▄▅▄▄▅▁ | 162.0 | 163.0 | 126.0 | 137.0 | 141.0 | 138.0 | 138.0 | 141.0 | 115.0 |
| us-gaap:ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest | ▆▆▆▁▃▆▆█▆ | 4.0 | 4.0 | 4.0 | 2.0 | 3.0 | 4.0 | 4.0 | 5.0 | 4.0 |
| us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest | ██▃▄▅▄▄▅▁ | 166.0 | 167.0 | 130.0 | 139.0 | 144.0 | 142.0 | 142.0 | 146.0 | 119.0 |
| us-gaap:CostsAndExpenses | █▂▇▂▅▃▁▃▁ | 83.0 | 75.0 | 82.0 | 75.0 | 79.0 | 76.0 | 73.0 | 76.0 | 73.0 |
| us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | ██▃▄▅▄▅▅▁ | 166.0 | 167.0 | 133.0 | 137.0 | 144.0 | 142.0 | 144.0 | 146.0 | 119.0 |
| us-gaap:InterestIncomeExpenseNonoperatingNet | ██▇▇▄▄▂▁█ | -21.0 | -21.0 | -22.0 | -22.0 | -24.0 | -24.0 | -25.0 | -26.0 | -21.0 |
| us-gaap:InterestIncomeOperating | ▇█▇█▇▁▂▁▁ | 7.0 | 8.0 | 7.0 | 8.0 | 7.0 | 1.0 | 2.0 | 1.0 | 1.0 |
| us-gaap:InterestPaidNet | ▁▆▄▅▆▇█▆▃ | 17.0 | 24.0 | 21.0 | 22.0 | 24.0 | 25.0 | 26.0 | 23.0 | 20.0 |
| us-gaap:NetIncomeLoss | ██▃▄▅▄▅▅▁ | 162.0 | 163.0 | 129.0 | 135.0 | 141.0 | 138.0 | 140.0 | 141.0 | 115.0 |
| us-gaap:NetIncomeLossAttributableToNoncontrollingInterest | ▆▆▆▁▃▆▆█▆ | 4.0 | 4.0 | 4.0 | 2.0 | 3.0 | 4.0 | 4.0 | 5.0 | 4.0 |
| us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic | ██▁▂▃ | 150.0 | 151.0 | 117.0 | 123.0 | 129.0 | NA | NA | NA | NA |
| us-gaap:NetIncomeLossAvailableToCommonStockholdersDiluted us-gaap:PartnerTypeOfPartnersCapitalAccount shlx:LimitedPartnersCommonUnits | ██▁▂▃ | 162.0 | 163.0 | 129.0 | 135.0 | 141.0 | NA | NA | NA | NA |
| us-gaap:NonoperatingIncomeExpense | ▁█ | 115.0 | 116.0 | NA | 116.0 | 120.0 | 121.0 | NA | 123.0 | 92.0 |
| us-gaap:OperatingCostsAndExpenses | ▂▂▅▁▂▄▇█▆ | 11.0 | 11.0 | 15.0 | 9.0 | 10.0 | 14.0 | 17.0 | 19.0 | 16.0 |
| us-gaap:OperatingIncomeLoss | ██▄▁▂▃▅▄▄ | 65.0 | 64.0 | 48.0 | 35.0 | 41.0 | 45.0 | 53.0 | 49.0 | 48.0 |
| us-gaap:OtherComprehensiveIncomeLossNetOfTax | NA | NA | NA | 2.0 | NA | NA | NA | NA | NA | |
| us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome | NA | NA | NA | 2.0 | NA | NA | NA | NA | NA | |
| us-gaap:OtherIncome | ▁█ | 10.0 | 14.0 | NA | 7.0 | 11.0 | 9.0 | NA | 8.0 | 12.0 |
| us-gaap:ProfitLoss | ██▃▄▅▄▅▅▁ | 166.0 | 167.0 | 133.0 | 137.0 | 144.0 | 142.0 | 144.0 | 146.0 | 119.0 |
| us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax | █▆▅▁▃▃▇▄▃ | 134.0 | 125.0 | 116.0 | 95.0 | 106.0 | 107.0 | 126.0 | 111.0 | 107.0 |
| us-gaap:Revenues | █▆▅▁▃▃▄▄▃ | 148.0 | 139.0 | 130.0 | 110.0 | 120.0 | 121.0 | 126.0 | 125.0 | 121.0 |
| us-gaap:SellingGeneralAndAdministrativeExpense | ▂▄▁▅▂▅▅▄█ | 1.0 | 2.0 | 0.0 | 3.0 | 1.0 | 3.0 | 3.0 | 2.0 | 5.0 |
| 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 |
|---|
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:Assets | ▇▆▇██▁▂▂▁ | 2327.0 | 2322.0 | 2347.0 | 2394.0 | 2416.0 | 1988.0 | 2019.0 | 2019.0 | 2004.0 |
| us-gaap:Liabilities | ▆▅██▆▁▂▃▂ | 2794.0 | 2789.0 | 2805.0 | 2808.0 | 2795.0 | 2762.0 | 2768.0 | 2776.0 | 2771.0 |
| us-gaap:LiabilitiesAndStockholdersEquity | ▇▆▇██▁▂▂▁ | 2327.0 | 2322.0 | 2347.0 | 2394.0 | 2416.0 | 1988.0 | 2019.0 | 2019.0 | 2004.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:AssetsCurrent | █▆▆▆▅▃▃▃▁ | 425.0 | 392.0 | 394.0 | 396.0 | 389.0 | 351.0 | 359.0 | 351.0 | 327.0 |
| us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents | █▅▆▆▆▄▃▄▁ | 353.0 | 317.0 | 320.0 | 329.0 | 332.0 | 292.0 | 290.0 | 294.0 | 257.0 |
| us-gaap:AccountsReceivableNetCurrent | ▃▄█▁▁▁▂▂▂ | 13.0 | 14.0 | 20.0 | 10.0 | 10.0 | 10.0 | 12.0 | 12.0 | 12.0 |
| us-gaap:Land | ████▁▁▁▁█ | 12.0 | 12.0 | 12.0 | 12.0 | 11.0 | 11.0 | 11.0 | 11.0 | 12.0 |
| us-gaap:MachineryAndEquipmentGross | ▅██▇▅▆▄▄▁ | 1239.0 | 1260.0 | 1263.0 | 1258.0 | 1238.0 | 1245.0 | 1228.0 | 1225.0 | 1202.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Amberjack | NA | NA | 836.0 | NA | NA | NA | 804.0 | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Bengal | NA | NA | 161.0 | NA | NA | NA | 157.0 | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Colonial | NA | NA | 3105.0 | NA | NA | NA | 2920.0 | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Explorer | NA | NA | 537.0 | NA | NA | NA | 530.0 | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Mars | NA | NA | 269.0 | NA | NA | NA | 173.0 | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Mattox | NA | NA | 204.0 | NA | NA | NA | NA | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:OtherInvestment | NA | NA | 920.0 | NA | NA | NA | 917.0 | NA | NA | |
| us-gaap:AssetsNoncurrent us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Poseidon | NA | NA | 176.0 | NA | NA | NA | 190.0 | NA | NA | |
| us-gaap:PropertyPlantAndEquipmentGross | NA | NA | 1356.0 | 1351.0 | 1330.0 | 1329.0 | 1312.0 | 1295.0 | 1272.0 | |
| us-gaap:ConstructionInProgressGross | ▁▁▁▂▃▂▄▆█ | 7.0 | 6.0 | 4.0 | 9.0 | 19.0 | 14.0 | 27.0 | 41.0 | 57.0 |
| us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | NA | NA | 661.0 | 652.0 | 639.0 | 626.0 | 613.0 | 603.0 | 591.0 | |
| us-gaap:PropertyPlantAndEquipmentNet | NA | NA | 699.0 | 708.0 | 710.0 | 717.0 | 726.0 | 733.0 | 738.0 | |
| us-gaap:OperatingLeaseRightOfUseAsset | ▁▁▁▁▁▁▁██ | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 5.0 | 5.0 |
| us-gaap:OtherAssetsNoncurrent | ▄▄▄▄▄▄▄▄▄ | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:AccountsPayableCurrent | ▇▃▅█▅▁▅▃▅ | 7.0 | 3.0 | 5.0 | 8.0 | 5.0 | 1.0 | 5.0 | 3.0 | 5.0 |
| us-gaap:AccruedLiabilitiesCurrent | ▄▂▁▇▅▂▂█▆ | 15.0 | 12.0 | 10.0 | 21.0 | 17.0 | 12.0 | 12.0 | 22.0 | 18.0 |
| us-gaap:ContractWithCustomerLiabilityCurrent | NA | 2.0 | 4.0 | 5.0 | 5.0 | 1.0 | 0.0 | 0.0 | 0.0 | |
| us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:MajorCustomers shlx:RelatedParties | ▇█▇▅▂▁▁▁▁ | 18.0 | 22.0 | 19.0 | 14.0 | 4.0 | 1.0 | 0.0 | 0.0 | 0.0 |
| us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:MajorCustomers shlx:ThirdParties | NA | 2.0 | 4.0 | 5.0 | 5.0 | 1.0 | 0.0 | 0.0 | 0.0 | |
| us-gaap:LiabilitiesCurrent | ▆▅██▆▁▂▃▂ | 73.0 | 67.0 | 82.0 | 85.0 | 72.0 | 40.0 | 46.0 | 54.0 | 48.0 |
| us-gaap:OtherAccruedLiabilitiesCurrent | NA | NA | 1.0 | 2.0 | 2.0 | 3.0 | 3.0 | 2.0 | 2.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:LiabilitiesNoncurrent | ▁▄███▄▄▄█ | 2721.0 | 2722.0 | 2723.0 | 2723.0 | 2723.0 | 2722.0 | 2722.0 | 2722.0 | 2723.0 |
| us-gaap:OperatingLeaseLiabilityNoncurrent | ▁▁▁▁▁▁▁▁█ | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 5.0 |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo | NA | NA | 1.0 | NA | NA | NA | NA | NA | NA | |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour | NA | NA | 1.0 | NA | NA | NA | NA | NA | NA | |
| us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive | NA | NA | 5.0 | 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | ▆▆▇▇█▁▁▁▁ | -467.0 | -467.0 | -458.0 | -414.0 | -379.0 | -774.0 | -749.0 | -757.0 | -767.0 |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity,us-gaap:PartnerTypeOfPartnersCapitalAccount shlx:ShellPipelineCompanyLP,shlx:CommonUnitsPublic | ▁▁▁▁▁████ | -2468.0 | -2498.0 | -2497.0 | -2474.0 | -2456.0 | -214.0 | -203.0 | -196.0 | -198.0 |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest dei:LegalEntity,us-gaap:PartnerTypeOfPartnersCapitalAccount shlx:ShellPipelineCompanyLP,us-gaap:PreferredPartner | ▁▁▁▁▁██ | -1059.0 | -1059.0 | -1059.0 | -1059.0 | -1059.0 | 0.0 | 0.0 | NA | NA |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:PartnerTypeOfPartnersCapitalAccount shlx:CommonUnitsPublic | ▁▂▂▄▅▆▇██ | 3363.0 | 3373.0 | 3382.0 | 3402.0 | 3421.0 | 3437.0 | 3450.0 | 3461.0 | 3458.0 |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Amberjack | NA | NA | 746.0 | NA | NA | NA | 824.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Bengal | NA | NA | 187.0 | NA | NA | NA | 186.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Colonial | NA | NA | -147.0 | NA | NA | NA | -149.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Explorer | NA | NA | 103.0 | NA | NA | NA | 137.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Mars | NA | NA | 190.0 | NA | NA | NA | 200.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Mattox | NA | NA | 205.0 | NA | NA | NA | NA | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:OtherInvestment | NA | NA | 413.0 | NA | NA | NA | 435.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:ScheduleOfEquityMethodInvestmentEquityMethodInvesteeName shlx:Poseidon | NA | NA | -41.0 | NA | NA | NA | -42.0 | NA | NA | |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:AccumulatedOtherComprehensiveIncome | ▁▁▁█▃▃▃██ | -9.0 | -9.0 | -9.0 | -6.0 | -8.0 | -8.0 | -8.0 | -6.0 | -6.0 |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:NoncontrollingInterest | ▁▇▇▇▇████ | 2.0 | 23.0 | 23.0 | 23.0 | 24.0 | 25.0 | 26.0 | 26.0 | 25.0 |
| us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents us-gaap:ReceivablesFromStockholder | ▁▁▁▁▁██ | -296.0 | -297.0 | -298.0 | -300.0 | -301.0 | 0.0 | 0.0 | NA | NA |
| us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax | ▁▁▁█▃▃▃██ | -9.0 | -9.0 | -9.0 | -6.0 | -8.0 | -8.0 | -8.0 | -6.0 | -6.0 |
| us-gaap:MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders | ▁█ | 3.0 | 4.0 | NA | 3.0 | 4.0 | 5.0 | NA | 4.0 | 6.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:NetCashProvidedByUsedInOperatingActivities | ▇▅▃▃█▄▂▆▁ | 185.0 | 166.0 | 147.0 | 149.0 | 192.0 | 162.0 | 139.0 | 175.0 | 133.0 |
| us-gaap:NetCashProvidedByUsedInInvestingActivities | █▇▇█▇▇▅▆▁ | 26.0 | 9.0 | 19.0 | 22.0 | 16.0 | 7.0 | -9.0 | -1.0 | -70.0 |
| us-gaap:NetCashProvidedByUsedInFinancingActivities | ▁▁▁▁▁▂▃▃█ | -175.0 | -178.0 | -175.0 | -174.0 | -168.0 | -167.0 | -134.0 | -137.0 | -32.0 |
| us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect | ▇▂▁▂█▃▂█▇ | 36.0 | -3.0 | -9.0 | -3.0 | 40.0 | 2.0 | -4.0 | 37.0 | 31.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:IncreaseDecreaseInAccountsPayable | NA | -5.0 | -4.0 | -2.0 | 16.0 | -3.0 | 2.0 | -1.0 | 2.0 | |
| us-gaap:IncreaseDecreaseInAccountsReceivable | ▁█ | 1.0 | 4.0 | NA | 6.0 | 1.0 | 3.0 | -3.0 | -7.0 | 8.0 |
| us-gaap:NetCashProvidedByUsedInOperatingActivities | ▇▅▃▃█▄▂▆▁ | 185.0 | 166.0 | 147.0 | 149.0 | 192.0 | 162.0 | 139.0 | 175.0 | 133.0 |
| us-gaap:NetIncomeLoss | ██▃▄▅▄▅▅▁ | 162.0 | 163.0 | 129.0 | 135.0 | 141.0 | 138.0 | 140.0 | 141.0 | 115.0 |
| us-gaap:ProfitLoss | ██▃▄▅▄▅▅▁ | 166.0 | 167.0 | 133.0 | 137.0 | 144.0 | 142.0 | 144.0 | 146.0 | 119.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:NetCashProvidedByUsedInInvestingActivities | █▇▇█▇▇▅▆▁ | 26.0 | 9.0 | 19.0 | 22.0 | 16.0 | 7.0 | -9.0 | -1.0 | -70.0 |
| us-gaap:PaymentsToAcquireProductiveAssets | ▂▁▆▅▂▄▄▄█ | 3.0 | 1.0 | 10.0 | 8.0 | 2.0 | 7.0 | 7.0 | 7.0 | 14.0 |
| 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 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| us-gaap:NetCashProvidedByUsedInFinancingActivities | ▁▁▁▁▁▂▃▃█ | -175.0 | -178.0 | -175.0 | -174.0 | -168.0 | -167.0 | -134.0 | -137.0 | -32.0 |
| 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 |
|---|
| 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 |
| Value | 162 | 163 | 126 | 137 | 141 | 138 | 138 | 141 | 115 | 132 | 140 | 149 | 111 |
| 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 |
| Percentage of InterestIncomeOperating | 2314.3 | 2037.5 | 0.0 | 1712.5 | 2014.3 | 13800.0 | 0.0 | 14100.0 | 11500.0 | 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 |
| Value | 4.0 | 4.0 | 4.0 | 2.0 | 3.0 | 4.0 | 4.0 | 5.0 | 4.0 | 5.0 | 7.0 | 6.0 | 4.0 |
| 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 |
| Percentage of InterestIncomeOperating | 57.1 | 50.0 | 0.0 | 25.0 | 42.9 | 400.0 | 0.0 | 500.0 | 400.0 | 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 |
| Value | 166 | 167 | 130 | 139 | 144 | 142 | 142 | 146 | 119 | 137 | 147 | 155 | 115 |
| 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 |
| Percentage of InterestIncomeOperating | 2371.4 | 2087.5 | 0.0 | 1737.5 | 2057.1 | 14200.0 | 0.0 | 14600.0 | 11900.0 | 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 | 2013-12-31 | 2013-09-30 |
| Value | 83 | 75 | 82 | 75 | 79 | 76 | 73 | 76 | 73 | 66 | 69 | 75 | 72 | 94 | 109 | 56 | 54 | 38 | 34 | 31 | 33 | 31 | 55 | 23 | 26 | 24 | 27 | 15 | 14 | -2.2 |
| 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 |
| Percentage of InterestIncomeOperating | 1185.7 | 937.5 | 0.0 | 937.5 | 1128.6 | 7600.0 | 0.0 | 7600.0 | 7300.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 |
| Value | 3.0 |
| Percentage of CostsAndExpenses | 4.0 |
| Percentage of InterestIncomeOperating | 37.5 |
| Percentage of InterestIncomeOperating shlx:April2020Acquisition | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 19 | 17 | 26 | 16 | 17 | 19 | 18 | 17 |
| Percentage of CostsAndExpenses | 22.9 | 22.7 | 31.7 | 21.3 | 21.5 | 25.0 | 23.7 | 23.3 |
| Percentage of InterestIncomeOperating | 271.4 | 212.5 | 0.0 | 200.0 | 242.9 | 1900.0 | 1800.0 | 1700.0 |
| Percentage of InterestIncomeOperating shlx:Amberjack us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 8.0 | 7.0 | 6.0 | 9.0 | 8.0 | 7.0 | 7.0 | 9.0 |
| Percentage of CostsAndExpenses | 9.6 | 9.3 | 7.3 | 12.0 | 10.1 | 9.2 | 9.2 | 12.3 |
| Percentage of InterestIncomeOperating | 114.3 | 87.5 | 0.0 | 112.5 | 114.3 | 700.0 | 700.0 | 900.0 |
| Percentage of InterestIncomeOperating shlx:Bengal us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 209 | 133 | 159 | 172 | 166 | 163 | 190 | 44 |
| Percentage of CostsAndExpenses | 251.8 | 177.3 | 193.9 | 229.3 | 210.1 | 214.5 | 250.0 | 60.3 |
| Percentage of InterestIncomeOperating | 2985.7 | 1662.5 | 0.0 | 2150.0 | 2371.4 | 16300.0 | 19000.0 | 4400.0 |
| Percentage of InterestIncomeOperating shlx:Colonial us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 51 | 42 | 43 | 42 | 43 | 47 | 51 | 13 |
| Percentage of CostsAndExpenses | 61.4 | 56.0 | 52.4 | 56.0 | 54.4 | 61.8 | 67.1 | 17.8 |
| Percentage of InterestIncomeOperating | 728.6 | 525.0 | 0.0 | 525.0 | 614.3 | 4700.0 | 5100.0 | 1300.0 |
| Percentage of InterestIncomeOperating shlx:Explorer us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 22 | 22 | 26 | 22 | 21 | 28 | 32 | 26 |
| Percentage of CostsAndExpenses | 26.5 | 29.3 | 31.7 | 29.3 | 26.6 | 36.8 | 42.1 | 35.6 |
| Percentage of InterestIncomeOperating | 314.3 | 275.0 | 0.0 | 275.0 | 300.0 | 2800.0 | 3200.0 | 2600.0 |
| Percentage of InterestIncomeOperating shlx:Mars us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 30 | 32 | 32 | 30 | 29 | 27 | 21 | 37 |
| Percentage of CostsAndExpenses | 36.1 | 42.7 | 39.0 | 40.0 | 36.7 | 35.5 | 27.6 | 50.7 |
| Percentage of InterestIncomeOperating | 428.6 | 400.0 | 0.0 | 375.0 | 414.3 | 2700.0 | 2100.0 | 3700.0 |
| Percentage of InterestIncomeOperating shlx:OtherInvestment us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 9.0 | 10.0 | 10.0 | 9.0 | 8.0 | 9.0 | 9.0 | 8.0 |
| Percentage of CostsAndExpenses | 10.8 | 13.3 | 12.2 | 12.0 | 10.1 | 11.8 | 11.8 | 11.0 |
| Percentage of InterestIncomeOperating | 128.6 | 125.0 | 0.0 | 112.5 | 114.3 | 900.0 | 900.0 | 800.0 |
| Percentage of InterestIncomeOperating shlx:Poseidon us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 |
| Value | 166 | 167 | 133 | 137 | 144 | 142 | 144 | 146 | 119 | 137 | 148 | 154 | 115 | 64 | 102 | 74 | 68 | 73 | 72 | 58 | 66 | 68 | 72 | 74 | 45 | 41 | 35 | 31 | 26 | 15 | 5.8 | 22 | 11 | 0.2 |
| 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 |
| Percentage of InterestIncomeOperating | 2371.4 | 2087.5 | 0.0 | 1712.5 | 2057.1 | 14200.0 | 0.0 | 14600.0 | 11900.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | -21000000.0 | -21000000.0 | -22000000.0 | -22000000.0 | -24000000.0 | -24000000.0 | -25000000.0 | -26000000.0 | -21000000.0 | -20000000.0 | -19600000.0 | -19000000.0 | -13300000.0 | -10600000.0 | -10200000.0 | -9700000.0 | -7500000.0 | -4800000.0 | -4500000.0 | -2800000.0 | -2000000.0 | -3000000.0 | -2100000.0 | -1700000.0 | -300000.0 | -200000.0 |
| Percentage of InterestIncomeExpenseNonoperatingNet | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 InterestIncomeOperating | -300.0 | -262.5 | 0.0 | -275.0 | -342.9 | -2400.0 | 0.0 | -2600.0 | -2100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 7.0 | 8.0 | 7.0 | 8.0 | 7.0 | 1.0 | 2.0 | 1.0 | 1.0 |
| Percentage of InterestIncomeOperating | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of InterestIncomeOperating | 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 |
| Value | 17 | 24 | 21 | 22 | 24 | 25 | 26 | 23 | 20 | 20 | 18 | 16 | 8.0 | 11 | 8.2 | 9.0 |
| Percentage of InterestPaidNet | 100.0 | 100.0 | 100.0 | 100.0 | 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 InterestIncomeOperating | 242.9 | 300.0 | 300.0 | 275.0 | 342.9 | 2500.0 | 1300.0 | 2300.0 | 2000.0 | 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 | 2013-09-30 |
| Value | 162 | 163 | 129 | 135 | 141 | 138 | 140 | 141 | 115 | 132 | 141 | 148 | 110 | 64 | 86 | 72 | 65 | 70 | 69 | 56 | 63 | 55 | 57 | 54 | 32 | 23 | 13 | 31 | 22 |
| 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 |
| Percentage of InterestIncomeOperating | 2314.3 | 2037.5 | 1842.9 | 1687.5 | 2014.3 | 13800.0 | 7000.0 | 14100.0 | 11500.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 4.0 | 4.0 | 4.0 | 2.0 | 3.0 | 4.0 | 4.0 | 5.0 | 4.0 | 5.0 | 6.9 | 5.9 | 4.7 | 0.8 | 12 | 1.9 | 2.2 | 2.2 | 2.8 | 2.5 | 2.5 | 12 | 15 | 20 | 13 | 17 |
| 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 |
| Percentage of InterestIncomeOperating | 57.1 | 50.0 | 57.1 | 25.0 | 42.9 | 400.0 | 200.0 | 500.0 | 400.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 150 | 151 | 117 | 123 | 129 |
| Percentage of NetIncomeLossAvailableToCommonStockholdersBasic | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of InterestIncomeOperating | 2142.9 | 1887.5 | 1671.4 | 1537.5 | 1842.9 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 117 | 123 | 129 |
| Percentage of NetIncomeLossAvailableToCommonStockholdersBasic | 100.0 | 100.0 | 100.0 |
| Percentage of InterestIncomeOperating | 1671.4 | 1537.5 | 1842.9 |
| Percentage of InterestIncomeOperating shlx:LimitedPartnersCommonUnits | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 162 | 163 | 129 | 135 | 141 |
| Percentage of NetIncomeLossAvailableToCommonStockholdersDiluted | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of InterestIncomeOperating | 2314.3 | 2037.5 | 1842.9 | 1687.5 | 2014.3 |
| Percentage of InterestIncomeOperating shlx:LimitedPartnersCommonUnits | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 | 2016-12-31 | 2016-09-30 |
| Value | 115 | 116 | 116 | 120 | 121 | 123 | 92 | 92 | 95 | 72 | 70 | 46 | 54 | 56 | 84 | 25 |
| Percentage of NonoperatingIncomeExpense | 100.0 | 100.0 | 100.0 | 100.0 | 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 InterestIncomeOperating | 1642.9 | 1450.0 | 1450.0 | 1714.3 | 12100.0 | 12300.0 | 9200.0 | 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 | 2013-12-31 | 2013-09-30 |
| Value | 11 | 11 | 15 | 9.0 | 10.0 | 14 | 17 | 19 | 16 | 13 | 18 | 20 | 24 | 43 | 39 | 25 | 22 | 12 | 13 | 11 | 12 | 9.4 | 22 | 9.2 | 7.7 | 6.9 | 12 | 4.4 | 3.8 | 11 |
| Percentage of OperatingCostsAndExpenses | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 InterestIncomeOperating | 157.1 | 137.5 | 214.3 | 112.5 | 142.9 | 1400.0 | 850.0 | 1900.0 | 1600.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2013-12-31 | 2013-09-30 |
| Value | 65 | 64 | 48 | 35 | 41 | 45 | 53 | 49 | 48 | 65 | 72 | 77 | 56 | 4.9 | 95 | 38 | 32 | 31 | 41 | 36 | 38 | 45 | 89 | 48 | 31 | 27 | 28 | 31 | 5.8 | 22 |
| 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 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of InterestIncomeOperating | 928.6 | 800.0 | 685.7 | 437.5 | 585.7 | 4500.0 | 2650.0 | 4900.0 | 4800.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 |
| Value | 19 |
| Percentage of OperatingIncomeLoss | 54.3 |
| Percentage of InterestIncomeOperating | 237.5 |
| Percentage of InterestIncomeOperating shlx:April2020Acquisition | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 51 | 55 | 35 | 53 | 57 | 57 | 62 | 57 |
| Percentage of OperatingIncomeLoss | 78.5 | 85.9 | 72.9 | 151.4 | 139.0 | 126.7 | 126.5 | 118.8 |
| Percentage of InterestIncomeOperating | 728.6 | 687.5 | 500.0 | 662.5 | 814.3 | 5700.0 | 6200.0 | 5700.0 |
| Percentage of InterestIncomeOperating shlx:Amberjack us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 4.0 | 6.0 | 8.0 | 10.0 | 7.0 | 10.0 | 15 | 10.0 |
| Percentage of OperatingIncomeLoss | 6.2 | 9.4 | 16.7 | 28.6 | 17.1 | 22.2 | 30.6 | 20.8 |
| Percentage of InterestIncomeOperating | 57.1 | 75.0 | 114.3 | 125.0 | 100.0 | 1000.0 | 1500.0 | 1000.0 |
| Percentage of InterestIncomeOperating shlx:Bengal us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 97 | 157 | 168 | 147 | 182 | 238 | 164 | 44 |
| Percentage of OperatingIncomeLoss | 149.2 | 245.3 | 350.0 | 420.0 | 443.9 | 528.9 | 334.7 | 91.7 |
| Percentage of InterestIncomeOperating | 1385.7 | 1962.5 | 2400.0 | 1837.5 | 2600.0 | 23800.0 | 16400.0 | 4400.0 |
| Percentage of InterestIncomeOperating shlx:Colonial us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 88 | 27 | 35 | 33 | 37 | 49 | 71 | 24 |
| Percentage of OperatingIncomeLoss | 135.4 | 42.2 | 72.9 | 94.3 | 90.2 | 108.9 | 144.9 | 50.0 |
| Percentage of InterestIncomeOperating | 1257.1 | 337.5 | 500.0 | 412.5 | 528.6 | 4900.0 | 7100.0 | 2400.0 |
| Percentage of InterestIncomeOperating shlx:Explorer us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 36 | 41 | 32 | 46 | 40 | 44 | 50 | 41 |
| Percentage of OperatingIncomeLoss | 55.4 | 64.1 | 66.7 | 131.4 | 97.6 | 97.8 | 102.0 | 85.4 |
| Percentage of InterestIncomeOperating | 514.3 | 512.5 | 457.1 | 575.0 | 571.4 | 4400.0 | 5000.0 | 4100.0 |
| Percentage of InterestIncomeOperating shlx:Mars us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 23 | 24 | 21 | 23 | 28 | 30 | 23 | 19 |
| Percentage of OperatingIncomeLoss | 35.4 | 37.5 | 43.8 | 65.7 | 68.3 | 66.7 | 46.9 | 39.6 |
| Percentage of InterestIncomeOperating | 328.6 | 300.0 | 300.0 | 287.5 | 400.0 | 3000.0 | 2300.0 | 1900.0 |
| Percentage of InterestIncomeOperating shlx:OtherInvestment us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 25 | 32 | 38 | 27 | 22 | 24 | 22 | 26 |
| Percentage of OperatingIncomeLoss | 38.5 | 50.0 | 79.2 | 77.1 | 53.7 | 53.3 | 44.9 | 54.2 |
| Percentage of InterestIncomeOperating | 357.1 | 400.0 | 542.9 | 337.5 | 314.3 | 2400.0 | 2200.0 | 2600.0 |
| Percentage of InterestIncomeOperating shlx:Poseidon us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2020-09-30 |
| Value | 2000000.0 |
| Percentage of OtherComprehensiveIncomeLossNetOfTax | 100.0 |
| Percentage of InterestIncomeOperating | 25.0 |
| Period End | 2020-09-30 |
| Value | 2000000.0 |
| Percentage of OtherComprehensiveIncomeLossNetOfTax | 100.0 |
| Percentage of InterestIncomeOperating | 25.0 |
| Percentage of InterestIncomeOperating us-gaap:AccumulatedOtherComprehensiveIncome | 0.0 |
| 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 | 2015-09-30 | 2015-06-30 |
| Value | 10.0 | 14 | 7.0 | 11 | 9.0 | 8.0 | 12 | 8.0 | 7.8 | 10 | 5.4 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.0 |
| Percentage of OtherIncome | 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 | 100.0 | 100.0 |
| Percentage of InterestIncomeOperating | 142.9 | 175.0 | 87.5 | 157.1 | 900.0 | 800.0 | 1200.0 | 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 |
| Value | 166 | 167 | 133 | 137 | 144 | 142 | 144 | 146 | 119 | 137 | 148 | 154 | 115 | 64 | 102 | 74 | 68 | 73 | 72 | 58 | 66 | 68 | 72 | 74 | 45 | 41 | 35 | 31 | 26 | 15 | 5.7 | 22 | 11 | 0.2 |
| 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 |
| Percentage of InterestIncomeOperating | 2371.4 | 2087.5 | 1900.0 | 1712.5 | 2057.1 | 14200.0 | 7200.0 | 14600.0 | 11900.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 | 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 | 2014-12-31 |
| Value | 103 | 103 | 85 | 88 | 39 | 49 | 40 | 47 | 45 | 50 | 36 | 16 | 31 | 25 | 25 | 29 | 7.2 | 5.9 | 7.2 | 6.9 | 7.9 | 8.0 | 2.1 |
| Percentage of ProfitLoss | 62.0 | 61.7 | 62.0 | 61.1 | 27.5 | 33.6 | 33.6 | 34.3 | 30.6 | 32.4 | 31.2 | 24.8 | 30.5 | 34.8 | 37.4 | 40.3 | 10.0 | 10.0 | 10.9 | 10.1 | 10.9 | 10.8 | 5.9 |
| Percentage of InterestIncomeOperating | 1471.4 | 1287.5 | 1062.5 | 1257.1 | 3900.0 | 4900.0 | 4000.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 InterestIncomeOperating shlx:ShellPipelineCompanyLP shlx:CommonUnitsPublic | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 | 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 | 2014-12-31 |
| Value | 47 | 48 | 38 | 41 | 44 | 56 | 45 | 58 | 56 | 62 | 43 | 20 | 34 | 29 | 25 | 29 | 29 | 24 | 28 | 23 | 21 | 19 | 4.5 |
| Percentage of ProfitLoss | 28.3 | 28.7 | 27.7 | 28.5 | 31.0 | 38.4 | 37.8 | 42.3 | 37.8 | 40.2 | 37.3 | 32.3 | 33.7 | 39.1 | 37.1 | 40.1 | 41.2 | 42.3 | 43.6 | 34.7 | 29.8 | 26.6 | 12.6 |
| Percentage of InterestIncomeOperating | 671.4 | 600.0 | 475.0 | 585.7 | 4400.0 | 5600.0 | 4500.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 InterestIncomeOperating shlx:CommonUnitsPublic | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2019-09-30 | 2019-06-30 |
| Value | 50 | 55 | 34 | 54 | 56 | 57 | 62 | 58 |
| Percentage of ProfitLoss | 30.1 | 32.9 | 25.6 | 39.4 | 38.9 | 40.1 | 42.5 | 48.7 |
| Percentage of InterestIncomeOperating | 714.3 | 687.5 | 485.7 | 675.0 | 800.0 | 5700.0 | 6200.0 | 5800.0 |
| Percentage of InterestIncomeOperating shlx:Amberjack us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 4.0 | 6.0 | 8.0 | 10.0 | 7.0 | 10.0 | 15 | 10.0 |
| Percentage of ProfitLoss | 2.4 | 3.6 | 6.0 | 7.3 | 4.9 | 7.0 | 10.3 | 8.4 |
| Percentage of InterestIncomeOperating | 57.1 | 75.0 | 114.3 | 125.0 | 100.0 | 1000.0 | 1500.0 | 1000.0 |
| Percentage of InterestIncomeOperating shlx:Bengal us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 45 | 97 | 99 | 89 | 116 | 169 | 109 | 27 |
| Percentage of ProfitLoss | 27.1 | 58.1 | 74.4 | 65.0 | 80.6 | 119.0 | 74.7 | 22.7 |
| Percentage of InterestIncomeOperating | 642.9 | 1212.5 | 1414.3 | 1112.5 | 1657.1 | 16900.0 | 10900.0 | 2700.0 |
| Percentage of InterestIncomeOperating shlx:Colonial us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 67 | 21 | 28 | 25 | 28 | 38 | 55 | 18 |
| Percentage of ProfitLoss | 40.4 | 12.6 | 21.1 | 18.2 | 19.4 | 26.8 | 37.7 | 15.1 |
| Percentage of InterestIncomeOperating | 957.1 | 262.5 | 400.0 | 312.5 | 400.0 | 3800.0 | 5500.0 | 1800.0 |
| Percentage of InterestIncomeOperating shlx:Explorer us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 36 | 41 | 33 | 46 | 40 | 44 | 50 | 42 |
| Percentage of ProfitLoss | 21.7 | 24.6 | 24.8 | 33.6 | 27.8 | 31.0 | 34.2 | 35.3 |
| Percentage of InterestIncomeOperating | 514.3 | 512.5 | 471.4 | 575.0 | 571.4 | 4400.0 | 5000.0 | 4200.0 |
| Percentage of InterestIncomeOperating shlx:Mars us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 21 | 23 | 20 | 20 | 23 | 25 | 21 | 17 |
| Percentage of ProfitLoss | 12.7 | 13.8 | 15.0 | 14.6 | 16.0 | 17.6 | 14.4 | 14.3 |
| Percentage of InterestIncomeOperating | 300.0 | 287.5 | 285.7 | 250.0 | 328.6 | 2500.0 | 2100.0 | 1700.0 |
| Percentage of InterestIncomeOperating shlx:OtherInvestment us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 24 | 31 | 37 | 26 | 20 | 22 | 20 | 23 |
| Percentage of ProfitLoss | 14.5 | 18.6 | 27.8 | 19.0 | 13.9 | 15.5 | 13.7 | 19.3 |
| Percentage of InterestIncomeOperating | 342.9 | 387.5 | 528.6 | 325.0 | 285.7 | 2200.0 | 2000.0 | 2300.0 |
| Percentage of InterestIncomeOperating shlx:Poseidon us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 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 | 2014-12-31 |
| Value | 4.0 | 4.0 | 2.0 | 3.0 | 4.0 | 5.0 | 4.0 | 5.0 | 6.9 | 6.0 | 4.0 | 0.8 | 12 | 1.9 | 2.2 | 2.2 | 2.8 | 2.5 | 2.5 | 12 | 15 | 20 | 11 |
| Percentage of ProfitLoss | 2.4 | 2.4 | 1.5 | 2.1 | 2.8 | 3.4 | 3.4 | 3.6 | 4.7 | 3.9 | 3.5 | 1.2 | 12.6 | 2.6 | 3.2 | 3.0 | 3.9 | 4.3 | 3.8 | 18.7 | 21.4 | 27.0 | 32.0 |
| Percentage of InterestIncomeOperating | 57.1 | 50.0 | 25.0 | 42.9 | 400.0 | 500.0 | 400.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 InterestIncomeOperating 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 |
| 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 | 134 | 125 | 116 | 95 | 106 | 107 | 126 | 111 | 107 | 117 | 142 | 139 | 115 | 85 | 126 | 94 | 86 | 70 | 75 | 67 | 71 | 76 | 84 | 72 | 57 | 51 | 55 | 46 | 43 | 36 | 20 | 20 | 26 | 26 |
| 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 |
| Percentage of InterestIncomeOperating | 1914.3 | 1562.5 | 1657.1 | 1187.5 | 1514.3 | 10700.0 | 6300.0 | 11100.0 | 10700.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 9.0 | 6.0 | 5.0 | 5.0 | 2.0 | 7.0 | 9.0 | 10.0 | 6.0 | 10.0 | 4.3 | 14 | 1.7 | 7.9 | 0.0 | 0.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 6.7 | 4.8 | 4.3 | 5.3 | 1.9 | 6.5 | 7.1 | 9.0 | 5.6 | 8.5 | 3.0 | 10.5 | 1.5 | 9.2 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating | 128.6 | 75.0 | 71.4 | 62.5 | 28.6 | 700.0 | 450.0 | 1000.0 | 600.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:ProductRevenue | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 1.0 | 2.0 | 2.0 | 1.8 | 2.1 | 1.5 | 1.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.5 | 1.6 | 1.7 | 2.1 | 1.9 | 1.9 | 1.6 | 0.9 | 1.9 | 1.7 | 1.3 | 1.5 | 1.3 | 1.5 |
| Percentage of InterestIncomeOperating | 28.6 | 25.0 | 28.6 | 25.0 | 28.6 | 200.0 | 100.0 | 100.0 | 200.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:StorageServices | 0.0 | 0.0 | 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 |
| Value | 31 | 30 | 30 | 31 | 30 | 12 | 12 | 12 | 11 | 12 | 11 | 11 | 11 | 11 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 23.1 | 24.0 | 25.9 | 32.6 | 28.3 | 11.2 | 9.5 | 10.8 | 10.3 | 10.3 | 8.1 | 8.2 | 9.9 | 13.3 |
| Percentage of InterestIncomeOperating | 442.9 | 375.0 | 428.6 | 387.5 | 428.6 | 1200.0 | 600.0 | 1200.0 | 1100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:TerminalingServices | 0.0 | 0.0 | 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 | 2019-06-30 |
| Value | 2.0 | 2.0 | 3.0 | 0.0 | 4.0 | 0.0 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.5 | 1.6 | 2.6 | 0.0 | 3.8 | 0.0 |
| Percentage of InterestIncomeOperating | 28.6 | 25.0 | 42.9 | 0.0 | 57.1 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:TerminalingServicesMajorMaintenance | 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 |
| Value | 51 | 44 | 37 | 31 | 41 | 55 | 54 | 55 | 51 | 50 | 51 | 52 | 42 | 30 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 38.1 | 35.2 | 31.9 | 32.6 | 38.7 | 51.4 | 42.9 | 49.5 | 47.7 | 42.7 | 36.1 | 37.3 | 36.6 | 35.7 |
| Percentage of InterestIncomeOperating | 728.6 | 550.0 | 528.6 | 387.5 | 585.7 | 5500.0 | 2700.0 | 5500.0 | 5100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:TransportationServices | 0.0 | 0.0 | 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 |
| Value | 1.0 | 1.0 | 3.0 | 2.0 | 1.0 | 1.0 | 1.0 | 2.0 | 1.0 | 1.0 | 1.4 | 1.2 | 1.2 | 1.2 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 0.7 | 0.8 | 2.6 | 2.1 | 0.9 | 0.9 | 0.8 | 1.8 | 0.9 | 0.9 | 1.0 | 0.9 | 1.0 | 1.4 |
| Percentage of InterestIncomeOperating | 14.3 | 12.5 | 42.9 | 25.0 | 14.3 | 100.0 | 50.0 | 200.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:TransportationServicesNonleaseService | 0.0 | 0.0 | 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 | 2020-09-30 | 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 |
| Value | 86 | 78 | 64 | 77 | 69 | 68 | 64 | 64 | 65 | 55 | 43 | 47 | 39 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 64.2 | 62.4 | 67.4 | 72.6 | 64.5 | 61.3 | 59.8 | 54.7 | 47.0 | 47.8 | 50.1 | 50.0 | 45.5 |
| Percentage of InterestIncomeOperating | 1228.6 | 975.0 | 800.0 | 1100.0 | 6900.0 | 6800.0 | 6400.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:RelatedParties shlx:TransportationTerminalingandStorageServices | 0.0 | 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 |
| Value | 2.0 | 2.0 | 3.0 | 2.0 | 2.0 | 2.0 | 3.0 | 2.0 | 2.0 | 2.0 | 2.1 | 1.8 | 2.3 | 2.3 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 1.5 | 1.6 | 2.6 | 2.1 | 1.9 | 1.9 | 2.4 | 1.8 | 1.9 | 1.7 | 1.5 | 1.3 | 2.0 | 2.7 |
| Percentage of InterestIncomeOperating | 28.6 | 25.0 | 42.9 | 25.0 | 28.6 | 200.0 | 150.0 | 200.0 | 200.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:ThirdParties shlx:StorageServices | 0.0 | 0.0 | 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 |
| Value | 37 | 39 | 36 | 24 | 25 | 29 | 31 | 31 | 32 | 40 | 57 | 56 | 54 | 32 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 27.6 | 31.2 | 31.0 | 25.3 | 23.6 | 27.1 | 24.6 | 27.9 | 29.9 | 34.2 | 40.1 | 40.7 | 47.5 | 37.6 |
| Percentage of InterestIncomeOperating | 528.6 | 487.5 | 514.3 | 300.0 | 357.1 | 2900.0 | 1550.0 | 3100.0 | 3200.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:ThirdParties shlx:TransportationServices | 0.0 | 0.0 | 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 | 2020-09-30 | 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 |
| Value | 39 | 41 | 26 | 27 | 31 | 33 | 34 | 42 | 58 | 57 | 35 | 57 | 59 |
| Percentage of RevenueFromContractWithCustomerExcludingAssessedTax | 29.1 | 32.8 | 27.4 | 25.5 | 29.0 | 29.7 | 31.8 | 35.9 | 42.0 | 49.5 | 40.8 | 60.9 | 68.8 |
| Percentage of InterestIncomeOperating | 557.1 | 512.5 | 325.0 | 385.7 | 3100.0 | 3300.0 | 3400.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of InterestIncomeOperating shlx:ThirdParties shlx:TransportationTerminalingandStorageServices | 0.0 | 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 |
| Value | 148 | 139 | 130 | 110 | 120 | 121 | 126 | 125 | 121 | 131 | 142 | 153 | 129 | 99 | 126 | 94 | 86 | 70 | 75 | 67 | 71 | 76 | 84 | 72 | 57 | 51 | 55 | 46 | 43 | 36 | 20 | 20 | 26 | 26 |
| 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 |
| Percentage of InterestIncomeOperating | 2114.3 | 1737.5 | 1857.1 | 1375.0 | 1714.3 | 12100.0 | 6300.0 | 12500.0 | 12100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 |
| Value | 22 |
| Percentage of Revenues | 20.0 |
| Percentage of InterestIncomeOperating | 275.0 |
| Percentage of InterestIncomeOperating shlx:April2020Acquisition | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 70 | 72 | 61 | 69 | 74 | 76 | 80 | 74 |
| Percentage of Revenues | 47.3 | 51.8 | 46.9 | 62.7 | 61.7 | 62.8 | 64.0 | 61.2 |
| Percentage of InterestIncomeOperating | 1000.0 | 900.0 | 871.4 | 862.5 | 1057.1 | 7600.0 | 8000.0 | 7400.0 |
| Percentage of InterestIncomeOperating shlx:Amberjack us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 12 | 13 | 14 | 19 | 15 | 17 | 22 | 19 |
| Percentage of Revenues | 8.1 | 9.4 | 10.8 | 17.3 | 12.5 | 14.0 | 17.6 | 15.7 |
| Percentage of InterestIncomeOperating | 171.4 | 162.5 | 200.0 | 237.5 | 214.3 | 1700.0 | 2200.0 | 1900.0 |
| Percentage of InterestIncomeOperating shlx:Bengal us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 306 | 290 | 327 | 319 | 348 | 401 | 354 | 88 |
| Percentage of Revenues | 206.8 | 208.6 | 251.5 | 290.0 | 290.0 | 331.4 | 283.2 | 72.7 |
| Percentage of InterestIncomeOperating | 4371.4 | 3625.0 | 4671.4 | 3987.5 | 4971.4 | 40100.0 | 35400.0 | 8800.0 |
| Percentage of InterestIncomeOperating shlx:Colonial us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 139 | 69 | 78 | 75 | 80 | 96 | 122 | 37 |
| Percentage of Revenues | 93.9 | 49.6 | 60.0 | 68.2 | 66.7 | 79.3 | 97.6 | 30.6 |
| Percentage of InterestIncomeOperating | 1985.7 | 862.5 | 1114.3 | 937.5 | 1142.9 | 9600.0 | 12200.0 | 3700.0 |
| Percentage of InterestIncomeOperating shlx:Explorer us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 58 | 63 | 58 | 68 | 61 | 72 | 82 | 67 |
| Percentage of Revenues | 39.2 | 45.3 | 44.6 | 61.8 | 50.8 | 59.5 | 65.6 | 55.4 |
| Percentage of InterestIncomeOperating | 828.6 | 787.5 | 828.6 | 850.0 | 871.4 | 7200.0 | 8200.0 | 6700.0 |
| Percentage of InterestIncomeOperating shlx:Mars us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 53 | 56 | 53 | 53 | 57 | 57 | 44 | 56 |
| Percentage of Revenues | 35.8 | 40.3 | 40.8 | 48.2 | 47.5 | 47.1 | 35.2 | 46.3 |
| Percentage of InterestIncomeOperating | 757.1 | 700.0 | 757.1 | 662.5 | 814.3 | 5700.0 | 4400.0 | 5600.0 |
| Percentage of InterestIncomeOperating shlx:OtherInvestment us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 34 | 42 | 48 | 36 | 30 | 33 | 31 | 34 |
| Percentage of Revenues | 23.0 | 30.2 | 36.9 | 32.7 | 25.0 | 27.3 | 24.8 | 28.1 |
| Percentage of InterestIncomeOperating | 485.7 | 525.0 | 685.7 | 450.0 | 428.6 | 3300.0 | 3100.0 | 3400.0 |
| Percentage of InterestIncomeOperating shlx:Poseidon us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2013-12-31 | 2013-09-30 |
| Value | 1.0 | 2.0 | 0.0 | 3.0 | 1.0 | 3.0 | 3.0 | 2.0 | 5.0 | 1.0 | 2.5 | 1.2 | 2.2 | 1.9 | 4.5 | 1.0 | 2.8 | 1.6 | 1.9 | 2.2 | 1.9 | 2.1 | 3.6 | 1.6 | 3.4 | 1.6 | 1.4 | 0.3 | 0.7 | 0.1 |
| Percentage of SellingGeneralAndAdministrativeExpense | 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 |
| Percentage of InterestIncomeOperating | 14.3 | 25.0 | 0.0 | 37.5 | 14.3 | 300.0 | 150.0 | 200.0 | 500.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2013-12-31 |
| Value | 2327 | 2322 | 2347 | 2394 | 2416 | 1988 | 2019 | 2019 | 2004 | 1915 | 1913 | 1898 | 1870 | 1387 | 1366 | 1116 | 1098 | 898 | 865 | 797 | 783 | 752 | 715 | 608 | 575 | 618 | 623 | 320 | 252 |
| 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 |
| 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 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 880 | 860 | 892 |
| Percentage of Assets | 37.5 | 42.6 | 46.6 |
| Percentage of Assets | 37.5 | 42.6 | 46.6 |
| Percentage of Assets shlx:Amberjack | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 194 | 192 | 183 |
| Percentage of Assets | 8.3 | 9.5 | 9.6 |
| Percentage of Assets | 8.3 | 9.5 | 9.6 |
| Percentage of Assets shlx:Bengal | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3606 | 3243 |
| Percentage of Assets | 153.6 | 160.6 |
| Percentage of Assets | 153.6 | 160.6 |
| Percentage of Assets shlx:Colonial | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 611 | 623 |
| Percentage of Assets | 26.0 | 30.9 |
| Percentage of Assets | 26.0 | 30.9 |
| Percentage of Assets shlx:Explorer | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 316 | 230 | 231 |
| Percentage of Assets | 13.5 | 11.4 | 12.1 |
| Percentage of Assets | 13.5 | 11.4 | 12.1 |
| Percentage of Assets shlx:Mars | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 217 |
| Percentage of Assets | 9.2 |
| Percentage of Assets | 9.2 |
| Percentage of Assets shlx:Mattox | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 955 | 977 | 926 |
| Percentage of Assets | 40.7 | 48.4 | 48.4 |
| Percentage of Assets | 40.7 | 48.4 | 48.4 |
| Percentage of Assets shlx:OtherInvestment | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 207 | 220 | 222 |
| Percentage of Assets | 8.8 | 10.9 | 11.6 |
| Percentage of Assets | 8.8 | 10.9 | 11.6 |
| Percentage of Assets shlx:Poseidon | 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 | 2013-12-31 |
| Value | 2794 | 2789 | 2805 | 2808 | 2795 | 2762 | 2768 | 2776 | 2771 | 2169 | 2170 | 2181 | 2191 | 977 | 1932 | 1092 | 1351 | 761 | 745 | 396 | 390 | 96 | 508 | 452 | 130 | 37 | 44 | 37 |
| 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 |
| Percentage of Assets | 120.1 | 120.1 | 119.5 | 117.3 | 115.7 | 138.9 | 137.1 | 137.5 | 138.3 | 113.3 | 113.4 | 114.9 | 117.2 | 70.4 | 141.4 | 97.8 | 123.0 | 84.7 | 86.1 | 49.8 | 49.9 | 12.8 | 71.1 | 74.3 | 22.7 | 6.1 | 7.2 | 14.9 |
| 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 |
| Value | 2327 | 2322 | 2347 | 2394 | 2416 | 1988 | 2019 | 2019 | 2004 | 1915 | 1913 | 1898 | 1870 | 1387 | 1366 | 1116 | 1098 | 898 | 865 | 797 | 783 | 752 | 715 | 608 | 575 | 618 | 623 | 320 | 252 |
| 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 |
| 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 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 880 | 860 | 892 |
| Percentage of LiabilitiesAndStockholdersEquity | 37.5 | 42.6 | 46.6 |
| Percentage of Assets | 37.5 | 42.6 | 46.6 |
| Percentage of Assets shlx:Amberjack | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 194 | 192 | 183 |
| Percentage of LiabilitiesAndStockholdersEquity | 8.3 | 9.5 | 9.6 |
| Percentage of Assets | 8.3 | 9.5 | 9.6 |
| Percentage of Assets shlx:Bengal | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3606 | 3243 |
| Percentage of LiabilitiesAndStockholdersEquity | 153.6 | 160.6 |
| Percentage of Assets | 153.6 | 160.6 |
| Percentage of Assets shlx:Colonial | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 611 | 623 |
| Percentage of LiabilitiesAndStockholdersEquity | 26.0 | 30.9 |
| Percentage of Assets | 26.0 | 30.9 |
| Percentage of Assets shlx:Explorer | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 316 | 230 | 231 |
| Percentage of LiabilitiesAndStockholdersEquity | 13.5 | 11.4 | 12.1 |
| Percentage of Assets | 13.5 | 11.4 | 12.1 |
| Percentage of Assets shlx:Mars | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 217 |
| Percentage of LiabilitiesAndStockholdersEquity | 9.2 |
| Percentage of Assets | 9.2 |
| Percentage of Assets shlx:Mattox | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 955 | 977 | 926 |
| Percentage of LiabilitiesAndStockholdersEquity | 40.7 | 48.4 | 48.4 |
| Percentage of Assets | 40.7 | 48.4 | 48.4 |
| Percentage of Assets shlx:OtherInvestment | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 207 | 220 | 222 |
| Percentage of LiabilitiesAndStockholdersEquity | 8.8 | 10.9 | 11.6 |
| Percentage of Assets | 8.8 | 10.9 | 11.6 |
| Percentage of Assets shlx:Poseidon | 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 |
| Value | 425 | 392 | 394 | 396 | 389 | 351 | 359 | 351 | 327 | 291 | 283 | 270 | 243 | 237 | 203 | 212 | 188 | 198 | 165 | 189 | 199 | 172 | 130 | 143 | 140 | 183 | 183 | 51 | 28 |
| 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 |
| Percentage of Assets | 18.3 | 16.9 | 16.8 | 16.5 | 16.1 | 17.7 | 17.8 | 17.4 | 16.3 | 15.2 | 14.8 | 14.3 | 13.0 | 17.1 | 14.9 | 19.1 | 17.2 | 22.1 | 19.1 | 23.8 | 25.5 | 22.9 | 18.3 | 23.6 | 24.4 | 29.6 | 29.5 | 16.1 | 11.4 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 44 | 56 | 46 |
| Percentage of AssetsCurrent | 11.2 | 15.6 | 16.2 |
| Percentage of Assets | 1.9 | 2.8 | 2.4 |
| Percentage of Assets shlx:Amberjack | 5.0 | 6.5 | 5.2 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 33 | 35 | 27 |
| Percentage of AssetsCurrent | 8.4 | 9.7 | 9.5 |
| Percentage of Assets | 1.4 | 1.7 | 1.4 |
| Percentage of Assets shlx:Bengal | 17.0 | 18.2 | 14.8 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 501 | 323 |
| Percentage of AssetsCurrent | 127.2 | 90.0 |
| Percentage of Assets | 21.3 | 16.0 |
| Percentage of Assets shlx:Colonial | 13.9 | 10.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 74 | 93 |
| Percentage of AssetsCurrent | 18.8 | 25.9 |
| Percentage of Assets | 3.2 | 4.6 |
| Percentage of Assets shlx:Explorer | 12.1 | 14.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 47 | 57 | 53 |
| Percentage of AssetsCurrent | 11.9 | 15.9 | 18.7 |
| Percentage of Assets | 2.0 | 2.8 | 2.8 |
| Percentage of Assets shlx:Mars | 14.9 | 24.8 | 22.9 |
| Period End | 2020-12-31 |
| Value | 13 |
| Percentage of AssetsCurrent | 3.3 |
| Percentage of Assets | 0.6 |
| Percentage of Assets shlx:Mattox | 6.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 35 | 60 | 50 |
| Percentage of AssetsCurrent | 8.9 | 16.7 | 17.6 |
| Percentage of Assets | 1.5 | 3.0 | 2.6 |
| Percentage of Assets shlx:OtherInvestment | 3.7 | 6.1 | 5.4 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 31 | 30 | 19 |
| Percentage of AssetsCurrent | 7.9 | 8.4 | 6.7 |
| Percentage of Assets | 1.3 | 1.5 | 1.0 |
| Percentage of Assets shlx:Poseidon | 15.0 | 13.6 | 8.6 |
| 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 | 2017-12-31 | 2016-12-31 |
| Value | 353 | 317 | 320 | 329 | 332 | 292 | 290 | 294 | 257 | 226 | 208 | 200 | 175 | 138 | 123 |
| 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 |
| Percentage of Assets | 15.2 | 13.7 | 13.6 | 13.7 | 13.7 | 14.7 | 14.4 | 14.6 | 12.8 | 11.8 | 10.9 | 10.5 | 9.4 | 10.1 | 14.2 |
| 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 | 2013-12-31 |
| Value | 13 | 14 | 20 | 10.0 | 10.0 | 10.0 | 12 | 12 | 12 | 14 | 18 | 18 | 19 | 8.0 | 17 | 12 | 17 | 16 | 18 | 13 | 17 | 18 | 18 | 16 | 14 | 16 | 16 | 8.8 | 4.8 |
| 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 |
| Percentage of Assets | 0.6 | 0.6 | 0.9 | 0.4 | 0.4 | 0.5 | 0.6 | 0.6 | 0.6 | 0.7 | 1.0 | 1.0 | 1.1 | 0.6 | 1.3 | 1.2 | 1.6 | 1.8 | 2.1 | 1.7 | 2.3 | 2.5 | 2.6 | 2.7 | 2.6 | 2.6 | 2.6 | 2.7 | 1.9 |
| 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 | 2018-01-01 |
| Value | 25 | 23 | 18 | 27 | 27 | 27 | 24 | 25 | 33 | 22 | 21 | 28 | 17 | 14 | 18 |
| Percentage of AccountsReceivableNetCurrent | 192.3 | 164.3 | 90.0 | 270.0 | 270.0 | 270.0 | 200.0 | 208.3 | 275.0 | 157.1 | 113.8 | 156.5 | 87.4 | 178.8 | 0.0 |
| Percentage of Assets | 1.1 | 1.0 | 0.8 | 1.1 | 1.1 | 1.4 | 1.2 | 1.2 | 1.6 | 1.1 | 1.1 | 1.5 | 0.9 | 1.0 | 0.0 |
| Percentage of Assets shlx:RelatedParties | 0.0 | 0.0 | 0.0 | 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 | 2018-01-01 |
| Value | 11 | 12 | 19 | 10.0 | 10.0 | 10.0 | 11 | 13 | 12 | 14 | 18 | 18 | 19 | 7.9 | 17 |
| Percentage of AccountsReceivableNetCurrent | 84.6 | 85.7 | 95.0 | 100.0 | 100.0 | 100.0 | 91.7 | 108.3 | 100.0 | 100.0 | 100.0 | 100.0 | 99.5 | 98.8 | 0.0 |
| Percentage of Assets | 0.5 | 0.5 | 0.8 | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.6 | 0.7 | 1.0 | 1.0 | 1.1 | 0.6 | 0.0 |
| Percentage of Assets shlx:ThirdParties | 0.0 | 0.0 | 0.0 | 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 | 2013-12-31 |
| Value | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 11 | 11 | 8.2 | 8.2 | 8.2 | 2.0 | 2.0 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.4 | 1.1 | 1.1 | 0.7 |
| Percentage of Land | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.6 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | 0.4 | 0.6 | 0.6 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 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 | 2014-12-31 | 2014-09-30 | 2013-12-31 |
| Value | 1239 | 1260 | 1263 | 1258 | 1238 | 1245 | 1228 | 1225 | 1202 | 1196 | 1162 | 1164 | 1155 | 1155 | 1153 | 888 | 899 | 591 | 589 | 578 | 572 | 572 | 572 | 328 | 320 | 320 | 313 | 294 | 257 |
| Percentage of MachineryAndEquipmentGross | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 53.2 | 54.3 | 53.8 | 52.5 | 51.2 | 62.6 | 60.8 | 60.7 | 60.0 | 62.5 | 60.7 | 61.3 | 61.8 | 83.3 | 84.4 | 79.5 | 81.9 | 65.8 | 68.1 | 72.6 | 73.1 | 76.0 | 80.0 | 53.9 | 55.7 | 51.8 | 50.3 | 91.8 | 101.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 836 | 804 | 846 |
| Percentage of AssetsNoncurrent | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 35.6 | 39.8 | 44.2 |
| Percentage of Assets shlx:Amberjack | 95.0 | 93.5 | 94.8 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 161 | 157 | 156 |
| Percentage of AssetsNoncurrent | 19.3 | 19.5 | 18.4 |
| Percentage of Assets | 6.9 | 7.8 | 8.2 |
| Percentage of Assets shlx:Bengal | 83.0 | 81.8 | 85.2 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3105 | 2920 |
| Percentage of AssetsNoncurrent | 371.4 | 363.2 |
| Percentage of Assets | 132.3 | 144.6 |
| Percentage of Assets shlx:Colonial | 86.1 | 90.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 537 | 530 |
| Percentage of AssetsNoncurrent | 64.2 | 65.9 |
| Percentage of Assets | 22.9 | 26.3 |
| Percentage of Assets shlx:Explorer | 87.9 | 85.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 269 | 173 | 178 |
| Percentage of AssetsNoncurrent | 32.2 | 21.5 | 21.0 |
| Percentage of Assets | 11.5 | 8.6 | 9.3 |
| Percentage of Assets shlx:Mars | 85.1 | 75.2 | 77.1 |
| Period End | 2020-12-31 |
| Value | 204 |
| Percentage of AssetsNoncurrent | 24.4 |
| Percentage of Assets | 8.7 |
| Percentage of Assets shlx:Mattox | 94.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 920 | 917 | 876 |
| Percentage of AssetsNoncurrent | 110.0 | 114.1 | 103.5 |
| Percentage of Assets | 39.2 | 45.4 | 45.8 |
| Percentage of Assets shlx:OtherInvestment | 96.3 | 93.9 | 94.6 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 176 | 190 | 203 |
| Percentage of AssetsNoncurrent | 21.1 | 23.6 | 24.0 |
| Percentage of Assets | 7.5 | 9.4 | 10.6 |
| Percentage of Assets shlx:Poseidon | 85.0 | 86.4 | 91.4 |
| 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 | 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 |
| Value | 1356 | 1351 | 1330 | 1329 | 1312 | 1295 | 1272 | 1266 | 1230 | 1233 | 1220 | 1220 | 1218 | 942 | 949 | 620 | 617 | 605 | 599 | 599 | 598 | 345 | 337 | 337 | 330 | 309 | 271 |
| Percentage of PropertyPlantAndEquipmentGross | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 57.8 | 56.4 | 55.0 | 66.9 | 65.0 | 64.1 | 63.5 | 66.1 | 64.3 | 64.9 | 65.3 | 87.9 | 89.2 | 84.4 | 86.4 | 69.0 | 71.3 | 76.0 | 76.5 | 79.6 | 83.7 | 56.8 | 58.7 | 54.6 | 53.0 | 96.4 | 107.5 |
| 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 | 2013-12-31 |
| Value | 7.0 | 6.0 | 4.0 | 9.0 | 19 | 14 | 27 | 41 | 57 | 53 | 79 | 73 | 69 | 56 | 44 | 34 | 37 | 29 | 20 | 23 | 23 | 15 | 10 | 3.1 | 8.6 | 6.1 | 10 | 23 | 7.2 |
| Percentage of ConstructionInProgressGross | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 0.3 | 0.3 | 0.2 | 0.4 | 0.8 | 0.7 | 1.3 | 2.0 | 2.8 | 2.8 | 4.1 | 3.9 | 3.7 | 4.1 | 3.2 | 3.1 | 3.4 | 3.3 | 2.3 | 3.0 | 2.9 | 2.0 | 1.4 | 0.5 | 1.5 | 1.0 | 1.7 | 7.3 | 2.9 |
| 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 | 2013-12-31 |
| Value | 661 | 652 | 639 | 626 | 613 | 603 | 591 | 579 | 567 | 562 | 548 | 537 | 526 | 368 | 372 | 245 | 239 | 233 | 227 | 222 | 216 | 77 | 73 | 69 | 66 | 63 | 54 |
| Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 28.2 | 27.2 | 26.4 | 31.5 | 30.4 | 29.9 | 29.5 | 30.2 | 29.6 | 29.6 | 29.3 | 38.7 | 38.5 | 33.0 | 33.9 | 27.3 | 27.7 | 29.3 | 29.1 | 29.5 | 30.2 | 12.6 | 12.8 | 11.3 | 10.7 | 19.7 | 21.7 |
| 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 | 2013-12-31 |
| Value | 699 | 708 | 710 | 717 | 726 | 733 | 738 | 740 | 742 | 743 | 741 | 739 | 736 | 608 | 614 | 403 | 398 | 395 | 394 | 392 | 392 | 271 | 272 | 273 | 275 | 269 | 223 |
| 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 |
| Percentage of Assets | 29.8 | 29.6 | 29.4 | 36.1 | 36.0 | 36.3 | 36.8 | 38.6 | 38.8 | 39.2 | 39.6 | 53.3 | 53.9 | 54.5 | 55.9 | 44.9 | 46.0 | 49.6 | 50.4 | 52.1 | 54.9 | 44.7 | 47.4 | 44.3 | 44.1 | 83.9 | 88.6 |
| 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 |
| Value | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 5000000.0 | 5000000.0 | 5000000.0 | 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 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 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 | 2013-12-31 |
| Value | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 3.0 | 2.5 | 2.6 | 2.6 | 2.6 | 1.7 | 1.3 | 0.6 | 39 | 39 | 37 | 11 | 6.2 | 6.8 | 6.8 | 6.9 | 4.2 | 4.2 | 0.0 |
| 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 | 0.0 |
| Percentage of Assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 4.4 | 4.6 | 4.7 | 1.5 | 0.8 | 1.0 | 1.1 | 1.2 | 0.7 | 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 | 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 |
| Value | 7.0 | 3.0 | 5.0 | 8.0 | 5.0 | 1.0 | 5.0 | 3.0 | 5.0 | 7.0 | 4.0 | 4.5 | 4.4 | 11 | 4.0 | 2.5 | 3.6 | 0.8 | 1.5 | 1.5 | 2.6 | 1.4 | 0.2 | 0.2 | 0.5 | 0.1 | 0.0 | 0.1 | 8.4 |
| 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 | 0.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.3 | 0.1 | 0.2 | 0.3 | 0.2 | 0.1 | 0.2 | 0.1 | 0.2 | 0.4 | 0.2 | 0.2 | 0.2 | 0.8 | 0.3 | 0.2 | 0.3 | 0.1 | 0.2 | 0.2 | 0.3 | 0.2 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 3.3 |
| 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 | 2013-12-31 |
| Value | 15 | 12 | 10.0 | 21 | 17 | 12 | 12 | 22 | 18 | 12 | 13 | 18 | 26 | 33 | 12 | 17 | 13 | 12 | 5.6 | 7.9 | 6.8 | 6.3 | 6.8 | 11 | 10 | 4.1 | 0.9 | 2.2 | 29 |
| Percentage of AccruedLiabilitiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 0.6 | 0.5 | 0.4 | 0.9 | 0.7 | 0.6 | 0.6 | 1.1 | 0.9 | 0.6 | 0.7 | 1.0 | 1.4 | 2.4 | 0.9 | 1.5 | 1.2 | 1.4 | 0.6 | 1.0 | 0.9 | 0.8 | 1.0 | 1.8 | 1.8 | 0.7 | 0.1 | 0.7 | 11.6 |
| 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 |
| Value | 2.0 | 4.0 | 5.0 | 5.0 | 1.0 | 0.0 | 0.0 | 0.0 | 1.0 | 8.0 | 6.3 | 4.8 | 4.3 | 5.5 |
| Percentage of ContractWithCustomerLiabilityCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.4 | 0.3 | 0.3 | 0.3 | 0.4 |
| 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 |
| Value | 18 | 22 | 19 | 14 | 4.0 | 1.0 | 0.0 | 0.0 | 0.0 | 1.0 | 2.6 | 4.3 | 6.7 | 8.5 | 13 |
| Percentage of ContractWithCustomerLiabilityCurrent | 0.0 | 1100.0 | 475.0 | 280.0 | 80.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 32.5 | 68.3 | 139.6 | 197.7 | 252.7 |
| Percentage of Assets | 0.8 | 0.9 | 0.8 | 0.6 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.2 | 0.4 | 0.6 | 1.0 |
| Percentage of Assets shlx:RelatedParties | 0.0 | 0.0 | 0.0 | 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 | 2021-03-31 | 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 |
| Value | 2.0 | 4.0 | 5.0 | 5.0 | 1.0 | 0.0 | 0.0 | 0.0 | 1.0 | 8.0 | 6.3 | 4.8 | 4.3 | 5.5 |
| Percentage of ContractWithCustomerLiabilityCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.1 | 0.2 | 0.2 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.4 | 0.3 | 0.3 | 0.3 | 0.4 |
| Percentage of Assets shlx:ThirdParties | 0.0 | 0.0 | 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 | 2013-12-31 |
| Value | 73 | 67 | 82 | 85 | 72 | 40 | 46 | 54 | 48 | 45 | 52 | 58 | 66 | 72 | 54 | 63 | 57 | 47 | 31 | 26 | 20 | 23 | 26 | 452 | 130 | 37 | 44 | 17 | 37 |
| 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 |
| Percentage of Assets | 3.1 | 2.9 | 3.5 | 3.6 | 3.0 | 2.0 | 2.3 | 2.7 | 2.4 | 2.3 | 2.7 | 3.1 | 3.6 | 5.2 | 4.0 | 5.7 | 5.2 | 5.3 | 3.6 | 3.3 | 2.6 | 3.1 | 3.6 | 74.3 | 22.7 | 6.1 | 7.2 | 5.4 | 14.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 10.0 | 4.0 | 4.0 |
| Percentage of LiabilitiesCurrent | 12.2 | 8.7 | 7.7 |
| Percentage of Assets | 0.4 | 0.2 | 0.2 |
| Percentage of Assets shlx:Amberjack | 1.1 | 0.5 | 0.4 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 7.0 | 6.0 | 9.0 |
| Percentage of LiabilitiesCurrent | 8.5 | 13.0 | 17.2 |
| Percentage of Assets | 0.3 | 0.3 | 0.5 |
| Percentage of Assets shlx:Bengal | 3.6 | 3.1 | 4.9 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 245 | 519 |
| Percentage of LiabilitiesCurrent | 298.8 | 1128.3 |
| Percentage of Assets | 10.4 | 25.7 |
| Percentage of Assets shlx:Colonial | 6.8 | 16.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 49 | 44 |
| Percentage of LiabilitiesCurrent | 59.8 | 95.7 |
| Percentage of Assets | 2.1 | 2.2 |
| Percentage of Assets shlx:Explorer | 8.0 | 7.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 23 | 8.0 | 5.0 |
| Percentage of LiabilitiesCurrent | 28.0 | 17.4 | 9.6 |
| Percentage of Assets | 1.0 | 0.4 | 0.3 |
| Percentage of Assets shlx:Mars | 7.3 | 3.5 | 2.2 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 56 | 73 | 65 |
| Percentage of LiabilitiesCurrent | 68.3 | 158.7 | 124.5 |
| Percentage of Assets | 2.4 | 3.6 | 3.4 |
| Percentage of Assets shlx:OtherInvestment | 5.9 | 7.5 | 7.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 10.0 | 16 | 16 |
| Percentage of LiabilitiesCurrent | 12.2 | 34.8 | 30.7 |
| Percentage of Assets | 0.4 | 0.8 | 0.8 |
| Percentage of Assets shlx:Poseidon | 4.8 | 7.3 | 7.2 |
| 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 | 2014-12-31 | 2014-09-30 | 2013-12-31 |
| Value | 1000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2400000.0 | 1900000.0 | 2200000.0 | 3000000.0 | 2500000.0 | 1700000.0 | 2500000.0 | 700000.0 | 1200000.0 | 100000.0 | 1900000.0 | 800000.0 | 600000.0 | 4000000.0 | 3300000.0 | 500000.0 | 100000.0 | 900000.0 | 1500000.0 |
| Percentage of OtherAccruedLiabilitiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 0.1 | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.1 | 0.1 | 0.0 | 0.2 | 0.1 | 0.1 | 0.7 | 0.6 | 0.1 | 0.0 | 0.3 | 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 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2014-12-31 |
| Value | 2721 | 2722 | 2723 | 2723 | 2723 | 2722 | 2722 | 2722 | 2723 | 2124 | 2118 | 2123 | 2124 | 904 | 1877 | 1029 | 1294 | 713 | 714 | 370 | 370 | 72 | 482 | 1.3 |
| Percentage of LiabilitiesNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 116.9 | 117.2 | 116.0 | 113.7 | 112.7 | 136.9 | 134.8 | 134.8 | 135.9 | 110.9 | 110.7 | 111.8 | 113.6 | 65.2 | 137.4 | 92.2 | 117.8 | 79.4 | 82.5 | 46.5 | 47.3 | 9.7 | 67.4 | 0.2 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 124 | 32 | 4.0 |
| Percentage of LiabilitiesNoncurrent | 4.6 | 1.2 | 0.2 |
| Percentage of Assets | 5.3 | 1.6 | 0.2 |
| Percentage of Assets shlx:Amberjack | 14.1 | 3.7 | 0.4 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 3508 | 2873 |
| Percentage of LiabilitiesNoncurrent | 128.8 | 105.5 |
| Percentage of Assets | 149.5 | 142.3 |
| Percentage of Assets shlx:Colonial | 97.3 | 88.6 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 459 | 442 |
| Percentage of LiabilitiesNoncurrent | 16.9 | 16.2 |
| Percentage of Assets | 19.6 | 21.9 |
| Percentage of Assets shlx:Explorer | 75.1 | 70.9 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 103 | 22 | 18 |
| Percentage of LiabilitiesNoncurrent | 3.8 | 0.8 | 0.8 |
| Percentage of Assets | 4.4 | 1.1 | 0.9 |
| Percentage of Assets shlx:Mars | 32.6 | 9.6 | 7.8 |
| Period End | 2020-12-31 |
| Value | 12 |
| Percentage of LiabilitiesNoncurrent | 0.4 |
| Percentage of Assets | 0.5 |
| Percentage of Assets shlx:Mattox | 5.5 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 486 | 469 | 456 |
| Percentage of LiabilitiesNoncurrent | 17.8 | 17.2 | 21.5 |
| Percentage of Assets | 20.7 | 23.2 | 23.8 |
| Percentage of Assets shlx:OtherInvestment | 50.9 | 48.0 | 49.2 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 238 | 246 | 243 |
| Percentage of LiabilitiesNoncurrent | 8.7 | 9.0 | 11.5 |
| Percentage of Assets | 10.1 | 12.2 | 12.7 |
| Percentage of Assets shlx:Poseidon | 115.0 | 111.8 | 109.5 |
| 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 |
| Value | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 4000000.0 | 5000000.0 | 5000000.0 | 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 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.0 |
| Period End | 2020-12-31 |
| Value | 1000000.0 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo | 100.0 |
| Percentage of Assets | 0.0 |
| Period End | 2020-12-31 |
| Value | 1000000.0 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour | 100.0 |
| Percentage of Assets | 0.0 |
| Period End | 2020-12-31 |
| Value | 5000000.0 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive | 100.0 |
| Percentage of Assets | 0.2 |
| Period End | 2020-12-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 |
| Value | 4000000.0 | 4000000.0 | 5000000.0 | 5000000.0 | 5000000.0 |
| Percentage of OperatingLeaseLiability | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Percentage of Assets | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 |
| Period End | 2020-12-31 |
| Value | 7000000.0 |
| Percentage of LesseeOperatingLeaseLiabilityPaymentsDue | 100.0 |
| Percentage of Assets | 0.3 |
| Period End | 2020-12-31 |
| Value | 3000000.0 |
| Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount | 100.0 |
| Percentage of Assets | 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 | 2014-11-02 | 2013-12-31 | 2012-12-31 | 2011-12-31 |
| Value | -467.0 | -467.0 | -458.0 | -414.0 | -379.0 | -774.0 | -749.0 | -757.0 | -767.0 | -254.0 | -257.0 | -283.2 | -320.8 | 410 | -565.9 | 24 | -252.5 | 137 | 119 | 400 | 392 | 656 | 207 | 156 | 444 | 580 | 578 | 320 | 214 | 118 | 118 |
| 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 |
| Percentage of Assets | -20.1 | -20.1 | -19.5 | -17.3 | -15.7 | -38.9 | -37.1 | -37.5 | -38.3 | -13.3 | -13.4 | -14.9 | -17.2 | 29.6 | -41.4 | 2.2 | -23.0 | 15.3 | 13.9 | 50.2 | 50.1 | 87.2 | 28.9 | 25.7 | 77.3 | 93.9 | 92.8 | 0.0 | 85.1 | 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 | 2013-12-31 |
| Value | -2468.0 | -2498.0 | -2497.0 | -2474.0 | -2456.0 | -214.0 | -203.0 | -196.0 | -198.0 | -196.0 | -198.0 | -205.1 | -219.0 | -219.7 | -507.2 | -510.2 | -509.1 | -508.9 | -124.1 | -125.6 | -126.1 | -128.2 | -130.4 | -133.9 | -137.8 | -138.8 | -140.3 | 0.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 528.5 | 534.9 | 545.2 | 597.6 | 648.0 | 27.6 | 27.1 | 25.9 | 25.8 | 77.2 | 77.0 | 72.4 | 68.3 | -53.5 | 89.6 | -2108.3 | 201.6 | -370.1 | -103.5 | -31.4 | -32.2 | -19.5 | -63.0 | -85.4 | -31.0 | -23.9 | -24.2 | 0.0 |
| Percentage of Assets | -106.1 | -107.6 | -106.4 | -103.3 | -101.7 | -10.8 | -10.1 | -9.7 | -9.9 | -10.2 | -10.3 | -10.8 | -11.7 | -15.8 | -37.1 | -45.7 | -46.3 | -56.6 | -14.3 | -15.8 | -16.1 | -17.0 | -18.2 | -22.0 | -24.0 | -22.4 | -22.5 | 0.0 |
| Percentage of Assets shlx:ShellPipelineCompanyLP shlx:CommonUnitsPublic | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | -1059.0 | -1059.0 | -1059.0 | -1059.0 | -1059.0 | 0.0 | 0.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 226.8 | 226.8 | 231.2 | 255.8 | 279.4 | -0.0 | -0.0 |
| Percentage of Assets | -45.5 | -45.6 | -45.1 | -44.2 | -43.8 | 0.0 | 0.0 |
| Percentage of Assets shlx:ShellPipelineCompanyLP us-gaap:PreferredPartner | 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 | 2013-12-31 |
| Value | 3363 | 3373 | 3382 | 3402 | 3421 | 3437 | 3450 | 3461 | 3458 | 3464 | 3459 | 3450 | 3433 | 3433 | 2773 | 2770 | 2493 | 2490 | 2485 | 2479 | 2476 | 2067 | 1637 | 1330 | 1320 | 1019 | 1016 | 0.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -720.1 | -722.3 | -738.4 | -821.7 | -902.6 | -444.1 | -460.6 | -457.2 | -450.8 | -1363.8 | -1346.0 | -1218.4 | -1070.4 | 836.8 | -490.1 | 11447.9 | -987.4 | 1811.3 | 2073.1 | 619.2 | 631.4 | 314.9 | 790.7 | 849.0 | 297.1 | 175.5 | 175.5 | 0.0 |
| Percentage of Assets | 144.5 | 145.3 | 144.1 | 142.1 | 141.6 | 172.9 | 170.9 | 171.4 | 172.6 | 180.9 | 180.8 | 181.7 | 183.6 | 247.4 | 203.0 | 248.1 | 226.9 | 277.1 | 287.2 | 311.0 | 316.2 | 274.7 | 228.9 | 218.6 | 229.7 | 164.9 | 162.9 | 0.0 |
| Percentage of Assets shlx:CommonUnitsPublic | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 746 | 824 | 884 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -162.9 | -110.0 | -344.0 |
| Percentage of Assets | 31.8 | 40.8 | 46.2 |
| Percentage of Assets shlx:Amberjack | 84.8 | 95.8 | 99.1 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 187 | 186 | 174 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -40.8 | -24.8 | -67.7 |
| Percentage of Assets | 8.0 | 9.2 | 9.1 |
| Percentage of Assets shlx:Bengal | 96.4 | 96.9 | 95.1 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | -147.0 | -149.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 32.1 | 19.9 |
| Percentage of Assets | -6.3 | -7.4 |
| Percentage of Assets shlx:Colonial | -4.1 | -4.6 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 103 | 137 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -22.5 | -18.3 |
| Percentage of Assets | 4.4 | 6.8 |
| Percentage of Assets shlx:Explorer | 16.9 | 22.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 190 | 200 | 208 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -41.5 | -26.7 | -80.9 |
| Percentage of Assets | 8.1 | 9.9 | 10.9 |
| Percentage of Assets shlx:Mars | 60.1 | 87.0 | 90.0 |
| Period End | 2020-12-31 |
| Value | 205 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -44.8 |
| Percentage of Assets | 8.7 |
| Percentage of Assets shlx:Mattox | 94.5 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 413 | 435 | 405 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -90.2 | -58.1 | -157.6 |
| Percentage of Assets | 17.6 | 21.5 | 21.2 |
| Percentage of Assets shlx:OtherInvestment | 43.2 | 44.5 | 43.7 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | -41.0 | -42.0 | -37.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 9.0 | 5.6 | 14.4 |
| Percentage of Assets | -1.7 | -2.1 | -1.9 |
| Percentage of Assets shlx:Poseidon | -19.8 | -19.1 | -16.7 |
| 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 | 2017-12-31 | 2016-12-31 |
| Value | -9.0 | -9.0 | -9.0 | -6.0 | -8.0 | -8.0 | -8.0 | -6.0 | -6.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 1.9 | 1.9 | 2.0 | 1.4 | 2.1 | 1.0 | 1.1 | 0.8 | 0.8 | -0.0 | -0.0 | -0.0 | 0.0 |
| Percentage of Assets | -0.4 | -0.4 | -0.4 | -0.3 | -0.3 | -0.4 | -0.4 | -0.3 | -0.3 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome | 0.0 | 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 | 2013-12-31 |
| Value | 2.0 | 23 | 23 | 23 | 24 | 25 | 26 | 26 | 25 | 27 | 25 | 23 | 22 | 22 | 23 | 20 | 20 | 20 | 21 | 22 | 22 | 108 | 108 | 104 | 99 | 154 | 161 | 0.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | -0.4 | -4.9 | -5.0 | -5.6 | -6.3 | -3.2 | -3.5 | -3.4 | -3.3 | -10.6 | -9.9 | -8.4 | -7.0 | 5.5 | -4.1 | 86.0 | -8.3 | 15.0 | 18.0 | 5.5 | 5.7 | 16.6 | 52.3 | 66.4 | 22.3 | 26.6 | 28.0 | 0.0 |
| Percentage of Assets | 0.1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.3 | 1.3 | 1.3 | 1.2 | 1.4 | 1.3 | 1.3 | 1.2 | 1.6 | 1.7 | 1.9 | 1.9 | 2.3 | 2.5 | 2.8 | 2.8 | 14.4 | 15.2 | 17.1 | 17.2 | 25.0 | 26.0 | 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 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 |
| Value | -296.0 | -297.0 | -298.0 | -300.0 | -301.0 | 0.0 | 0.0 |
| Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 63.4 | 63.6 | 65.1 | 72.5 | 79.4 | -0.0 | -0.0 |
| Percentage of Assets | -12.7 | -12.8 | -12.7 | -12.5 | -12.5 | 0.0 | 0.0 |
| Percentage of Assets us-gaap:ReceivablesFromStockholder | 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 |
| Value | -9000000.0 | -9000000.0 | -9000000.0 | -6000000.0 | -8000000.0 | -8000000.0 | -8000000.0 | -6000000.0 | -6000000.0 | 0 |
| Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Percentage of Assets | -0.4 | -0.4 | -0.4 | -0.3 | -0.3 | -0.4 | -0.4 | -0.3 | -0.3 | 0.0 |
| 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 |
| Value | 3.0 | 4.0 | 3.0 | 4.0 | 5.0 | 4.0 | 6.0 | 3.0 | 5.0 | 4.0 | 2.0 |
| 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 |
| 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 |
| 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 |
| Value | 3.0 | 4.0 | 3.0 | 4.0 | 5.0 | 4.0 | 6.0 | 3.0 | 5.0 | 4.0 | 2.0 |
| 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 |
| 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 |
| 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 |
| 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 |
| Value | 185 | 166 | 147 | 149 | 192 | 162 | 139 | 175 | 133 | 150 | 140 | 154 | 104 | 109 | 156 | 100 | 81 | 93 | 68 | 73 | 78 | 72 | 58 | 87 | 64 | 72 |
| 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 |
| Percentage of InterestIncomeOperating | 2642.9 | 2075.0 | 2100.0 | 1862.5 | 2742.9 | 16200.0 | 6950.0 | 17500.0 | 13300.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 26 | 9.0 | 19 | 22 | 16 | 7.0 | -9.0 | -1.0 | -70.0 | -7.0 | -10.6 | -11.6 | -489.8 | 1.7 | -286.4 | -0.8 | -221.0 | -0.9 | -96.4 | -32.2 | -98.9 | -0.6 | -96.6 | -37.9 | -55.3 | -11.3 |
| 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 |
| Percentage of InterestIncomeOperating | 371.4 | 112.5 | 271.4 | 275.0 | 228.6 | 700.0 | -450.0 | -100.0 | -7000.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | -175.0 | -178.0 | -175.0 | -174.0 | -168.0 | -167.0 | -134.0 | -137.0 | -32.0 | -125.0 | -121.7 | -118.2 | 375 | -63.7 | 95 | -63.4 | 120 | -59.9 | -11.4 | -49.0 | 51 | -26.8 | 13 | -44.6 | -52.8 | -54.6 |
| 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 |
| Percentage of InterestIncomeOperating | -2500.0 | -2225.0 | -2500.0 | -2175.0 | -2400.0 | -16700.0 | -6700.0 | -13700.0 | -3200.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 36 | -3.0 | -9.0 | -3.0 | 40 | 2.0 | -4.0 | 37 | 31 | 18 | 8.0 | 25 |
| Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect | 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 InterestIncomeOperating | 514.3 | -37.5 | -128.6 | -37.5 | 571.4 | 200.0 | -200.0 | 3700.0 | 3100.0 | 0.0 | 0.0 | 0.0 |
| 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 | 2013-12-31 |
| Value | -5.0 | -4.0 | -2.0 | 16 | -3.0 | 2.0 | -1.0 | 2.0 | -1.0 | -1.6 | -6.6 | -3.8 | 5.1 | 4.7 | -1.6 | 5.3 | -0.1 | 0.1 | 1.9 | -3.3 | -0.2 | 0.7 | 0.5 | 0.5 | -6.2 | 6.9 | -2.7 |
| 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 |
| 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 | 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 | 2013-12-31 |
| Value | 1.0 | 4.0 | 6.0 | 1.0 | 3.0 | -3.0 | -7.0 | 8.0 | -5.0 | -6.1 | 9.4 | 16 | -13.0 | 6.5 | -13.3 | 16 | -2.7 | 6.5 | -2.3 | -4.0 | -0.3 | 6.6 | -2.4 | 1.9 | -6.1 | 4.3 | 9.1 |
| 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 |
| 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 |
| Value | 185 | 166 | 147 | 149 | 192 | 162 | 139 | 175 | 133 | 150 | 140 | 154 | 104 | 109 | 156 | 100 | 81 | 93 | 68 | 73 | 78 | 72 | 58 | 87 | 64 | 72 |
| 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 |
| Percentage of InterestIncomeOperating | 2642.9 | 2075.0 | 2100.0 | 1862.5 | 2742.9 | 16200.0 | 6950.0 | 17500.0 | 13300.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2013-09-30 |
| Value | 162 | 163 | 129 | 135 | 141 | 138 | 140 | 141 | 115 | 132 | 141 | 148 | 110 | 64 | 86 | 72 | 65 | 70 | 69 | 56 | 63 | 55 | 57 | 54 | 32 | 23 | 13 | 31 | 22 |
| 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 |
| Percentage of InterestIncomeOperating | 2314.3 | 2037.5 | 1842.9 | 1687.5 | 2014.3 | 13800.0 | 7000.0 | 14100.0 | 11500.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 166 | 167 | 133 | 137 | 144 | 142 | 144 | 146 | 119 | 137 | 148 | 154 | 115 | 64 | 102 | 74 | 68 | 73 | 72 | 58 | 66 | 68 | 72 | 74 | 45 | 41 | 35 | 31 | 26 | 15 | 5.7 | 22 | 11 | 0.2 |
| 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 |
| Percentage of InterestIncomeOperating | 2371.4 | 2087.5 | 1900.0 | 1712.5 | 2057.1 | 14200.0 | 7200.0 | 14600.0 | 11900.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 | 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 | 2014-12-31 |
| Value | 103 | 103 | 85 | 88 | 39 | 49 | 40 | 47 | 45 | 50 | 36 | 16 | 31 | 25 | 25 | 29 | 7.2 | 5.9 | 7.2 | 6.9 | 7.9 | 8.0 | 2.1 |
| Percentage of ProfitLoss | 62.0 | 61.7 | 62.0 | 61.1 | 27.5 | 33.6 | 33.6 | 34.3 | 30.6 | 32.4 | 31.2 | 24.8 | 30.5 | 34.8 | 37.4 | 40.3 | 10.0 | 10.0 | 10.9 | 10.1 | 10.9 | 10.8 | 5.9 |
| Percentage of InterestIncomeOperating | 1471.4 | 1287.5 | 1062.5 | 1257.1 | 3900.0 | 4900.0 | 4000.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 InterestIncomeOperating shlx:ShellPipelineCompanyLP shlx:CommonUnitsPublic | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2020-09-30 | 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 | 2014-12-31 |
| Value | 47 | 48 | 38 | 41 | 44 | 56 | 45 | 58 | 56 | 62 | 43 | 20 | 34 | 29 | 25 | 29 | 29 | 24 | 28 | 23 | 21 | 19 | 4.5 |
| Percentage of ProfitLoss | 28.3 | 28.7 | 27.7 | 28.5 | 31.0 | 38.4 | 37.8 | 42.3 | 37.8 | 40.2 | 37.3 | 32.3 | 33.7 | 39.1 | 37.1 | 40.1 | 41.2 | 42.3 | 43.6 | 34.7 | 29.8 | 26.6 | 12.6 |
| Percentage of InterestIncomeOperating | 671.4 | 600.0 | 475.0 | 585.7 | 4400.0 | 5600.0 | 4500.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 InterestIncomeOperating shlx:CommonUnitsPublic | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2019-09-30 | 2019-06-30 |
| Value | 50 | 55 | 34 | 54 | 56 | 57 | 62 | 58 |
| Percentage of ProfitLoss | 30.1 | 32.9 | 25.6 | 39.4 | 38.9 | 40.1 | 42.5 | 48.7 |
| Percentage of InterestIncomeOperating | 714.3 | 687.5 | 485.7 | 675.0 | 800.0 | 5700.0 | 6200.0 | 5800.0 |
| Percentage of InterestIncomeOperating shlx:Amberjack us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 4.0 | 6.0 | 8.0 | 10.0 | 7.0 | 10.0 | 15 | 10.0 |
| Percentage of ProfitLoss | 2.4 | 3.6 | 6.0 | 7.3 | 4.9 | 7.0 | 10.3 | 8.4 |
| Percentage of InterestIncomeOperating | 57.1 | 75.0 | 114.3 | 125.0 | 100.0 | 1000.0 | 1500.0 | 1000.0 |
| Percentage of InterestIncomeOperating shlx:Bengal us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 45 | 97 | 99 | 89 | 116 | 169 | 109 | 27 |
| Percentage of ProfitLoss | 27.1 | 58.1 | 74.4 | 65.0 | 80.6 | 119.0 | 74.7 | 22.7 |
| Percentage of InterestIncomeOperating | 642.9 | 1212.5 | 1414.3 | 1112.5 | 1657.1 | 16900.0 | 10900.0 | 2700.0 |
| Percentage of InterestIncomeOperating shlx:Colonial us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 67 | 21 | 28 | 25 | 28 | 38 | 55 | 18 |
| Percentage of ProfitLoss | 40.4 | 12.6 | 21.1 | 18.2 | 19.4 | 26.8 | 37.7 | 15.1 |
| Percentage of InterestIncomeOperating | 957.1 | 262.5 | 400.0 | 312.5 | 400.0 | 3800.0 | 5500.0 | 1800.0 |
| Percentage of InterestIncomeOperating shlx:Explorer us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 36 | 41 | 33 | 46 | 40 | 44 | 50 | 42 |
| Percentage of ProfitLoss | 21.7 | 24.6 | 24.8 | 33.6 | 27.8 | 31.0 | 34.2 | 35.3 |
| Percentage of InterestIncomeOperating | 514.3 | 512.5 | 471.4 | 575.0 | 571.4 | 4400.0 | 5000.0 | 4200.0 |
| Percentage of InterestIncomeOperating shlx:Mars us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 21 | 23 | 20 | 20 | 23 | 25 | 21 | 17 |
| Percentage of ProfitLoss | 12.7 | 13.8 | 15.0 | 14.6 | 16.0 | 17.6 | 14.4 | 14.3 |
| Percentage of InterestIncomeOperating | 300.0 | 287.5 | 285.7 | 250.0 | 328.6 | 2500.0 | 2100.0 | 1700.0 |
| Percentage of InterestIncomeOperating shlx:OtherInvestment us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 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 | 2019-09-30 | 2019-06-30 |
| Value | 24 | 31 | 37 | 26 | 20 | 22 | 20 | 23 |
| Percentage of ProfitLoss | 14.5 | 18.6 | 27.8 | 19.0 | 13.9 | 15.5 | 13.7 | 19.3 |
| Percentage of InterestIncomeOperating | 342.9 | 387.5 | 528.6 | 325.0 | 285.7 | 2200.0 | 2000.0 | 2300.0 |
| Percentage of InterestIncomeOperating shlx:Poseidon us-gaap:EquityMethodInvestmentNonconsolidatedInvesteeOther | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 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 | 2014-12-31 |
| Value | 4.0 | 4.0 | 2.0 | 3.0 | 4.0 | 5.0 | 4.0 | 5.0 | 6.9 | 6.0 | 4.0 | 0.8 | 12 | 1.9 | 2.2 | 2.2 | 2.8 | 2.5 | 2.5 | 12 | 15 | 20 | 11 |
| Percentage of ProfitLoss | 2.4 | 2.4 | 1.5 | 2.1 | 2.8 | 3.4 | 3.4 | 3.6 | 4.7 | 3.9 | 3.5 | 1.2 | 12.6 | 2.6 | 3.2 | 3.0 | 3.9 | 4.3 | 3.8 | 18.7 | 21.4 | 27.0 | 32.0 |
| Percentage of InterestIncomeOperating | 57.1 | 50.0 | 25.0 | 42.9 | 400.0 | 500.0 | 400.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 InterestIncomeOperating 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 |
| 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 |
| Value | 26 | 9.0 | 19 | 22 | 16 | 7.0 | -9.0 | -1.0 | -70.0 | -7.0 | -10.6 | -11.6 | -489.8 | 1.7 | -286.4 | -0.8 | -221.0 | -0.9 | -96.4 | -32.2 | -98.9 | -0.6 | -96.6 | -37.9 | -55.3 | -11.3 |
| 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 |
| Percentage of InterestIncomeOperating | 371.4 | 112.5 | 271.4 | 275.0 | 228.6 | 700.0 | -450.0 | -100.0 | -7000.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2013-12-31 |
| Value | 3.0 | 1.0 | 10.0 | 8.0 | 2.0 | 7.0 | 7.0 | 7.0 | 14 | 10.0 | 10 | 13 | 15 | 9.4 | 22 | 14 | 13 | 7.3 | 7.0 | 7.5 | 9.1 | 4.7 | 8.6 | 4.0 | 1.1 | 2.5 | 7.0 | 67 |
| 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 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-05-01 |
| Value | 10.0 |
| Percentage of PaymentsToAcquireProductiveAssets | 0.0 |
| Period End | 2021-05-01 |
| Value | 10.0 |
| Percentage of PaymentsToAcquireProductiveAssets | 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 |
| Value | -175.0 | -178.0 | -175.0 | -174.0 | -168.0 | -167.0 | -134.0 | -137.0 | -32.0 | -125.0 | -121.7 | -118.2 | 375 | -63.7 | 95 | -63.4 | 120 | -59.9 | -11.4 | -49.0 | 51 | -26.8 | 13 | -44.6 | -52.8 | -54.6 |
| 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 |
| Percentage of InterestIncomeOperating | -2500.0 | -2225.0 | -2500.0 | -2175.0 | -2400.0 | -16700.0 | -6700.0 | -13700.0 | -3200.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 |
| Value | 7.0 | 5.0 | 4.0 | 8.0 | 10.0 | 7.0 | 6.0 | 8.0 | 6.0 | 7.0 | 6.0 | 8.0 | 8.0 | 8.0 |
| Percentage of AllocatedGeneralCorporateExpensesRelatedParty | 100.0 | 100.0 | 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 |
| Value | 13 | 14 | 12 | 13 | 16 | 4.0 | 5.0 | 5.0 | 3.0 | 5.0 | 4.0 | 3.0 | 3.0 | 4.0 |
| Percentage of AllocatedOperatingExpensesRelatedParty | 100.0 | 100.0 | 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 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2017-12-31 | 2017-09-30 | 2016-12-31 | 2016-09-30 | 2015-12-31 | 2014-12-31 | 2013-12-31 |
| Value | 0 | 0 | 0 | 8000000.0 | 0 | 1000000.0 | 0 | 0 | 5500000.0 | 0 | 0 | 0 | 0 | 0 | 700000.0 | 3000000.0 | 0 |
| Percentage of AllowanceOilNetRealizableValueReduction | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 | 100.0 | 0.0 | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 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 |
| Value | 1.0 | 2.0 | 0.0 | 0.0 | 3.0 | 5.0 | 5.0 | 7.0 | 14 | 0.0 | 0.0 |
| Percentage of CapitalContributiontoEquityMethodInvestment | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 |
| Period End | 2020-07-01 |
| Value | 2.0 |
| Percentage of CapitalLeaseRateIncreaseDecrease | 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 |
| Value | 0.0 | 1.0 | 2.0 | 3.0 | 4.0 | -4.0 | 5.0 | 0.0 | -4.0 | 2.0 | -3.5 | 0.6 | -3.8 | 4.3 | 1.6 | 1.2 | -7.4 | 4.7 | -0.6 | 0.5 | 1.0 | -0.4 | 2.5 | 1.4 | -1.5 | 0.5 |
| Percentage of ChangeInAccruedCapitalExpenditures | 0.0 | 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 |
| 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 |
| Value | 7.0 | 4.0 | 3.0 | 2.0 | 15 | 0.0 | 2.0 | 1.0 | 0.7 | 1.2 | 0.0 | 0.0 | 0.0 |
| Percentage of CostofGoodsSoldThirdParties | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-03-23 |
| Value | 2000000.0 |
| Percentage of DebtInstrumentEarlyPrepaymentFee | 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 |
| Value | 16 | 17 | 16 | 17 | 16 | 17 | 17 |
| Percentage of DistributionToHoldersOfIncentiveDistributionRightsWaived | 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 |
| Value | 3.0 | 4.0 | 4.0 | 3.0 | 4.0 | 5.0 | 4.0 | 4.0 | 6.0 | 3.0 | 5.3 | 4.5 | 4.7 | 1.9 | 10 | 2.0 | 3.4 | 3.2 | 3.2 | 2.7 | 2.0 | 12 | 11 | 30 | 0.0 | 25 |
| Percentage of DistributionsPaidToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| 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 |
| Value | 173 | 173 | 173 | 172 | 163 | 162 | 140 | 131 | 119 | 129 | 120 | 113 | 105 | 83 | 77 | 68 | 63 | 58 | 53 | 49 | 41 | 35 | 30 | 27 | 24 | 14 |
| Percentage of DistributionsPaidToUnitholdersAndGeneralPartner | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2018-12-31 | 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 | 173 | 173 | 172 | 163 | 162 | 131 | 119 | 129 | 120 | 113 | 106 | 83 | 77 | 68 | 63 | 58 | 53 | 49 | 41 | 35 | 30 | 27 |
| Percentage of DistributionsToUnitholdersAndGeneralPartner | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2018-12-31 | 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 | 104 | 104 | 103 | 51 | 50 | 47 | 42 | 40 | 38 | 36 | 35 | 29 | 28 | 27 | 25 | 5.9 | 5.7 | 5.4 | 5.1 | 4.7 | 4.4 | 4.1 |
| Percentage of DistributionsToUnitholdersAndGeneralPartner | 60.1 | 60.1 | 59.9 | 31.3 | 30.9 | 35.9 | 35.3 | 31.0 | 31.6 | 31.9 | 33.0 | 35.6 | 36.6 | 39.6 | 40.7 | 10.1 | 10.6 | 11.0 | 12.2 | 13.3 | 14.5 | 14.8 |
| 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 |
| Value | 57 | 57 | 57 | 57 | 57 | 53 | 51 | 49 | 47 | 45 | 43 | 32 | 31 | 26 | 25 | 24 | 23 | 22 | 17 | 13 | 11 | 10 |
| Percentage of DistributionsToUnitholdersAndGeneralPartner | 32.9 | 32.9 | 33.1 | 35.0 | 35.2 | 40.5 | 42.9 | 38.0 | 39.1 | 39.8 | 40.6 | 39.6 | 40.6 | 39.4 | 40.4 | 41.8 | 43.4 | 44.9 | 42.7 | 39.4 | 36.3 | 36.8 |
| 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 | 2014-12-31 |
| Value | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 1000000.0 | 1000000.0 | 900000.0 | 900000.0 | 900000.0 | 1000000.0 | 1700000.0 | 700000.0 | 700000.0 | 700000.0 | 1700000.0 | 300000.0 | 300000.0 | 300000.0 | 100000.0 |
| Percentage of EquityMethodInvestmentAmortizationAccretion | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 0.0 | 23 | 0.0 | 0.0 | 0.0 | 23 | 0.0 |
| Percentage of FinanceLeaseCost | 0.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 0.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | -38000000.0 | -32000000.0 | -24000000.0 | 1000000.0 | -16000000.0 |
| Percentage of IncomeDistributionsInExcess | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | -38000000.0 | -32000000.0 | -24000000.0 | 1000000.0 | -15000000.0 |
| Percentage of IncomeDistributionsInExcess | 100.0 | 100.0 | 100.0 | 100.0 | 93.8 |
| 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 | 2013-12-31 |
| Value | 4.0 | 5.0 | 3.0 | 2.0 | 1.0 | 0.0 | -1.0 | 1.0 | 2.0 | -2.0 | 2.5 | -3.2 | 6.1 | 0.4 | 1.7 | 2.4 | 0.4 | -1.1 | 1.2 | 2.8 | 0.4 | 0.4 | 0.7 | 2.2 | 0.2 | -0.3 | -0.9 | -4.2 |
| Percentage of IncreaseDecreaseInAllowanceOil | 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 |
| 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 |
| Value | 5.0 | 5.0 | 4.0 | 6.0 | 5.0 | 5.0 | 5.0 | 4.0 | 5.0 | 4.0 | 4.0 | 4.0 |
| Percentage of InsuranceExpenseRelatedParties | 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 |
| Value | 10.0 | 14 | 12 | 7.0 | 9.0 | 9.0 | 8.0 | 8.0 | 9.0 | 8.0 | 6.6 | 7.8 | 9.0 | 1.0 |
| Percentage of InvestmentExcessDistribution | 100.0 | 100.0 | 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 | 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 |
| Value | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 36 | 11 | 13 | 5.5 | 13 | 0.0 |
| Percentage of LeaseRevenueRelatedParties | 100.0 | 100.0 | 100.0 | 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 |
| Period End | 2020-09-30 | 2019-09-30 | 2018-09-30 |
| Value | 15 | 14 | 14 |
| Percentage of LeaseRevenueRelatedParties | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-06-30 |
| Value | 2000000.0 | 1000000.0 | 3000000.0 | 0 | 3000000.0 | 0 |
| Percentage of MaintenanceServiceCostsRelatedParty | 100.0 | 100.0 | 100.0 | 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 | 3000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 2000000.0 |
| Percentage of ManagementAgreementFeeRelatedParty | 100.0 | 100.0 | 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 |
| Value | 0.36 | 0.37 | 0.29 | 0.3 | 0.32 | 0.36 | 0.36 | 0.45 | 0.38 |
| Percentage of NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitDilutedNetOfTax | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-05-01 |
| Value | 7.5 |
| Percentage of NoncontrollingInterestInterestTransferred | 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 |
| Value | 2.0 | 3.0 | 3.0 | 3.0 | 2.0 | 3.0 | 3.0 | 3.0 | 2.0 | 3.0 | 3.0 | 2.0 | 2.0 | 2.0 |
| Percentage of OmnibusAgreementFeeRelatedParty | 100.0 | 100.0 | 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 |
| Value | 34 | 27 | 30 | 32 | 14 | 14 | 16 | 14 |
| Percentage of OperationsAndMaintenanceRelatedParties | 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 |
| Value | 14 | 7.0 | 19 | 11 | 8.0 | 5.0 | 5.0 | 5.0 | 8.0 | 5.0 | 7.0 | 6.0 |
| Percentage of OtherOperatingExpensesRelatedParties | 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 | 2019-06-30 |
| Value | -2000000.0 | 2000000.0 | 0 |
| Percentage of OtherSeveranceSalariesAndOtherPayrollExpensesRelatedParty | 100.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 |
| Value | 0 | 2000000.0 |
| Percentage of PaymentsOfFeeOnCreditFacility | 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 |
| Value | 1.0 | 1.0 | 0.0 | 0.0 | 10.0 | -1.0 | 3.0 | 7.0 | 4.7 | 1.0 | 4.8 | 1.1 | 4.6 | 1.2 | 9.6 | 2.8 | 1.5 | 2.7 | -1.4 | 1.8 | 11 | 0.0 | 0.0 | 0.0 |
| Percentage of ProceedsFromOtherContributionsFromParent | 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 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 444 | 444 | 17 | 444 | 444 |
| Percentage of WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingDiluted | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 |
| Value | 3000000.0 |
| Percentage of AssetImpairmentCharges | 100.0 |
| Period End | 2021-06-30 |
| Value | 4000000.0 |
| Percentage of AssetImpairmentCharges | 133.3 |
| Period End | 2021-03-31 |
| Value | 3000000.0 |
| Percentage of AssetImpairmentCharges | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 4.0 | 4.0 | 11 | 4.0 | 4.0 |
| Percentage of CapitalizedContractCostAmortization | 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 |
| Value | 3.0 | 7.0 | 5.0 | 11 | 4.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 1.2 | 1.5 | 0.0 |
| Percentage of ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 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 | 0.0 | 2.0 | 1.0 | 1.0 | 5.0 | 1.0 | 0.0 | 0.0 | 0.0 | 0.0 | 3.5 | 3.1 | 2.0 | 1.4 |
| Percentage of ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress | 0.0 | 28.6 | 20.0 | 9.1 | 125.0 | 100.0 | 0.0 | 0.0 | 0.0 | 0.0 | 875.0 | 258.3 | 133.3 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 3.0 | 3.0 | 1.0 |
| Percentage of ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress | 100.0 | 42.9 | 20.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 0.0 | 6.0 | 5.0 |
| Percentage of ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress | 0.0 | 85.7 | 100.0 |
| Period End | 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 | 2018-09-30 | 2018-06-30 | 2018-03-31 |
| Value | 4000000.0 | 1000000.0 | 1000000.0 | 0 | 0 | 0 | 1000000.0 | 2000000.0 | -17700000.0 | 3600000.0 | 3300000.0 | 900000.0 |
| Percentage of ContractWithCustomerLiabilityRevenueRecognized | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 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 | 2018-09-30 | 2018-06-30 | 2018-03-31 |
| Value | 4000000.0 | 1000000.0 | 1000000.0 | 0 | 0 | 0 | 1000000.0 | 7000000.0 | -13200000.0 | 1600000.0 | 1500000.0 | 2600000.0 |
| Percentage of ContractWithCustomerLiabilityRevenueRecognized | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 | 0.0 | 100.0 | 350.0 | 74.6 | 44.4 | 45.5 | 288.9 |
| 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 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 |
| Value | 1000000.0 | 1000000.0 | 0 | 1000000.0 | 1000000.0 | 1000000.0 | 0 | 1000000.0 | 1000000.0 | 1000000.0 | 1100000.0 | 600000.0 | 700000.0 | 1000000.0 | 900000.0 | 500000.0 | 300000.0 | 300000.0 | 300000.0 | 300000.0 | 300000.0 | 200000.0 | 200000.0 |
| Percentage of DefinedContributionPlanCostRecognized | 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 |
| 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 |
| Value | 12 | 13 | 11 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 17 | 8.9 | 9.6 | 6.2 | 6.0 | 6.0 | 5.8 | 5.9 | 11 | 3.5 | 3.5 | 3.4 | 3.4 | 2.9 | 2.0 | 1.6 |
| Percentage of Depreciation | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2019-12-31 | 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 |
| Value | 0.3 | 0.46 | 0.46 | 0.46 | 0.46 | 0.46 | 0.445 | 0.43 | 0.415 | 0.4 | 0.382 | 0.365 | 0.348 | 0.333 | 0.318 | 0.3041 | 0.291 | 0.277 | 0.26375 | 0.25 | 0.235 | 0.22 | 0.205 | 0.19 | 0.175 | 0.1042 |
| Percentage of DistributionMadeToLimitedPartnerDistributionsPaidPerUnit | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2020-07-23 |
| Value | 0.46 |
| Percentage of DistributionMadeToLimitedPartnerDistributionsPaidPerUnit | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 |
| Value | 0 | 3000000.0 |
| Percentage of ImpairmentOfOilAndGasProperties | 0.0 | 100.0 |
| Period End | 2021-03-31 |
| Value | 3000000.0 |
| Percentage of ImpairmentOfOilAndGasProperties | 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 |
| Value | 105 | 102 | 87 | 109 | 109 | 112 | 108 | 115 | 80 | 70 | 73 | 72 | 48 | 40 | 69 | 41 | 37 | 38 | 30 | 21 | 25 | 23 | 22 | 24 | 10 | 12 |
| 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 |
| 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 | 26 | 29 | 16 | 28 | 29 | 29 | 31 | 31 | 31 | 32 | 31 | 33 | 16 | 0.0 |
| Percentage of IncomeLossFromEquityMethodInvestments | 24.8 | 28.4 | 18.4 | 25.7 | 26.6 | 25.9 | 28.7 | 27.0 | 38.8 | 45.7 | 42.1 | 45.4 | 33.1 | 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 | 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 |
| Value | 2.0 | 3.0 | 4.0 | 5.0 | 4.0 | 5.0 | 6.0 | 8.0 | 5.0 | 5.0 | 5.7 | 5.3 | 5.4 | 4.4 | 5.7 | 6.2 | 5.4 | 5.3 | 4.3 | 5.2 | 5.3 | 5.4 | 5.0 | 5.6 | 5.1 | 5.1 | 3.3 |
| Percentage of IncomeLossFromEquityMethodInvestments | 1.9 | 2.9 | 4.6 | 4.6 | 3.7 | 4.5 | 5.6 | 7.0 | 6.2 | 7.1 | 7.7 | 7.3 | 11.2 | 10.9 | 8.2 | 15.0 | 14.5 | 13.7 | 13.9 | 24.3 | 20.7 | 23.3 | 22.0 | 23.2 | 47.2 | 40.8 | 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 | 2018-06-30 |
| Value | 7.0 | 15 | 16 | 14 | 18 | 27 | 19 | 17 | 4.0 | 0.0 |
| Percentage of IncomeLossFromEquityMethodInvestments | 6.7 | 14.7 | 18.4 | 12.8 | 16.5 | 24.1 | 17.6 | 14.8 | 5.0 | 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 | 2018-06-30 |
| Value | 26 | 7.0 | 11 | 9.0 | 10.0 | 14 | 14 | 20 | 7.0 | 0.0 |
| Percentage of IncomeLossFromEquityMethodInvestments | 24.8 | 6.9 | 12.6 | 8.3 | 9.2 | 12.5 | 13.0 | 17.4 | 8.8 | 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 |
| Value | 25 | 29 | 22 | 33 | 28 | 31 | 33 | 35 | 29 | 29 | 31 | 30 | 21 | 24 | 58 | 22 | 20 | 21 | 15 | 8.6 | 12 | 10 | 9.6 | 10 | 5.7 | 7.4 | 3.4 |
| Percentage of IncomeLossFromEquityMethodInvestments | 23.8 | 28.4 | 25.3 | 30.3 | 25.7 | 27.7 | 30.6 | 30.4 | 36.2 | 41.4 | 42.9 | 41.4 | 43.8 | 61.7 | 83.6 | 53.4 | 54.3 | 55.6 | 49.5 | 40.2 | 47.7 | 47.0 | 42.3 | 43.6 | 52.8 | 59.2 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-06-30 |
| Value | 15 | 15 | 15 | 15 | 15 | 0.0 |
| Percentage of IncomeLossFromEquityMethodInvestments | 14.3 | 14.7 | 17.2 | 13.8 | 13.8 | 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 | 2018-06-30 |
| Value | 4.0 | 4.0 | 3.0 | 5.0 | 5.0 | 6.0 | 5.0 | 4.0 | 4.0 | 5.0 |
| Percentage of IncomeLossFromEquityMethodInvestments | 3.8 | 3.9 | 3.4 | 4.6 | 4.6 | 5.4 | 4.6 | 3.5 | 5.0 | 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 |
| Value | 5.0 | 5.0 | -2.0 | 5.0 | 1.0 | 0.0 | 1.0 | 2.0 | 0.0 | 3.0 | 3.3 | 0.3 | 1.3 | 0.9 | 2.4 | 2.6 | 0.7 | 0.8 | 0.9 | -1.7 | -2.0 | 1.0 | -27.4 | 24 | 4.5 | 0.0 |
| Percentage of IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | 100.0 | 100.0 | 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 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 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 | 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 | 2013-12-31 |
| Value | 5.0 | -10.0 | 3.0 | 3.0 | -9.0 | 8.0 | 7.0 | 0.0 | -5.8 | -1.4 | 2.6 | 15 | -9.3 | 4.2 | 6.3 | 3.4 | -6.8 | 3.0 | 2.2 | -0.1 | -1.7 | 2.6 | 4.2 | 4.4 | -3.7 | -3.3 |
| Percentage of IncreaseDecreaseInAccruedLiabilities | 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 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | -4000000.0 | -4000000.0 | -3000000.0 | -4000000.0 |
| Percentage of IncreaseDecreaseInContractWithCustomerAsset | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 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 |
| Value | 11 | 7.0 | 2.0 | 0.0 | -3.0 | -8.0 | -1.2 | -1.0 | -2.0 |
| Percentage of IncreaseDecreaseInContractWithCustomerLiability | 100.0 | 100.0 | 100.0 | 0.0 | 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 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 |
| Value | -8000000.0 | -8000000.0 | 4000000.0 | -7000000.0 | -3000000.0 | -4000000.0 | -6000000.0 | -4000000.0 | -3700000.0 | -3600000.0 | -2800000.0 | -2600000.0 | -2300000.0 | 500000.0 | 5300000.0 | -1100000.0 | -1600000.0 | -1600000.0 | 3700000.0 | -200000.0 | -1200000.0 | -1100000.0 |
| Percentage of IncreaseDecreaseInPrepaidExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 20 | 21 | 21 | 22 | 23 | 24 | 25 | 26 | 22 | 20 | 19 | 18 | 12 | 10.0 | 9.6 | 9.1 | 6.7 | 4.0 | 3.6 | 2.0 | 1.0 | 2.1 |
| Percentage of InterestExpenseRelatedParty | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 7.0 | 8.0 | 8.0 | 7.0 |
| Percentage of InterestIncomeRelatedParty | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 |
| Value | 0 | 68.5 | 46.0 | 0.46 |
| Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest | 0.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 0 | 68.5 | 0 |
| Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest | 0.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 |
| Value | 0 | 72.0 |
| Percentage of LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest | 0.0 | 105.1 |
| 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 |
| Value | 130 | 173 | 173 | 173 | 173 | 162 | 162 | 140 | 131 | 119 | 129 | 121 | 113 | 105 | 83 | 77 | 68 | 63 | 58 | 53 | 49 | 41 | 35 | 30 | 27 | 24 | 14 |
| Percentage of ManagingMemberOrGeneralPartnerSubsequentDistributionAmount | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 37 | 57 | 57 | 57 | 57 | 57 | 57 | 56 | 53 | 51 | 49 | 47 | 45 | 43 | 32 | 31 | 26 | 25 | 24 | 23 | 22 | 17 | 13 | 11 | 10 | 8.0 | 4.8 |
| Percentage of ManagingMemberOrGeneralPartnerSubsequentDistributionAmount | 28.5 | 32.9 | 32.9 | 32.9 | 32.9 | 35.2 | 35.2 | 40.0 | 40.5 | 42.9 | 38.4 | 39.1 | 39.9 | 40.8 | 39.6 | 40.6 | 39.4 | 40.4 | 41.8 | 43.2 | 44.9 | 42.9 | 39.1 | 36.3 | 36.8 | 33.2 | 33.3 |
| 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 |
| Value | 81 | 104 | 104 | 104 | 104 | 50 | 50 | 48 | 47 | 42 | 40 | 38 | 36 | 34 | 29 | 28 | 27 | 25 | 5.9 | 5.7 | 5.4 | 5.1 | 4.7 | 4.4 | 4.1 | 3.8 | 2.2 |
| Percentage of ManagingMemberOrGeneralPartnerSubsequentDistributionAmount | 62.3 | 60.1 | 60.1 | 60.1 | 60.1 | 30.9 | 30.9 | 34.3 | 35.9 | 35.3 | 31.0 | 31.6 | 32.2 | 32.9 | 35.6 | 36.6 | 39.6 | 40.7 | 10.1 | 10.6 | 11.0 | 12.2 | 13.3 | 14.5 | 14.8 | 15.8 | 15.3 |
| 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 |
| Value | 12 | 12 | 12 | 12 | 12 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Percentage of ManagingMemberOrGeneralPartnerSubsequentDistributionAmount | 9.2 | 6.9 | 6.9 | 6.9 | 6.9 | 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 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 |
| Value | 0.0 | 0.0 | 0.0 | 55 | 54 | 36 | 30 | 2.3 | 1.5 | 0.7 | 0.5 |
| Percentage of NetIncomeLossAllocatedToGeneralPartners | 0.0 | 0.0 | 0.0 | 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 |
| Value | 150 | 151 | 117 | 123 | 129 | 83 | 86 | 105 | 85 | 105 | 101 | 112 | 79 | 37 | 65 | 55 | 51 | 58 | 59 | 49 | 58 | 52 | 54 | 52 | 31 | 23 | 13 |
| Percentage of NetIncomeLossAllocatedToLimitedPartners | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 0.38 | 0.38 | 0.3 | 0.31 | 0.33 | 0.36 | 0.36 | 0.45 | 0.38 |
| Percentage of NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasic | 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 | 2019-06-30 |
| Value | 12 | 12 | 36 | 12 | 12 | 0.0 |
| Percentage of NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Period End | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-06-30 |
| Value | 12 | 12 | 12 | 0.0 |
| Percentage of NoncontrollingInterestInNetIncomeLossPreferredUnitHoldersRedeemable | 33.3 | 100.0 | 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 |
| Value | -7.0 | 372 | 0.0 | 1.0 | 2.0 | 369 | 0.0 |
| Percentage of OperatingLeaseCost | 100.0 | 100.0 | 0.0 | 100.0 | 100.0 | 100.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-09-30 | 2019-06-30 |
| Value | 14 | 14 | 15 | 14 | 14 | 14 | 14 |
| Percentage of OperatingLeaseLeaseIncome | 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 |
| Value | 3000000.0 | -2000000.0 | 0 | 0 | 2000000.0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax | 100.0 | 100.0 | 0.0 | 0.0 | 100.0 | 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 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-09-30 | 2015-06-30 |
| Value | 1000000.0 | 2000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 2000000.0 | 1000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 1100000.0 | 1600000.0 | 1700000.0 | 2000000.0 | 1100000.0 | 1200000.0 | 900000.0 | 800000.0 | 700000.0 | 700000.0 | 600000.0 | 1500000.0 | 1100000.0 |
| Percentage of OtherPostretirementBenefitExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2019-12-31 | 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 | 161 | 161 | 161 | 162 | 162 | 140 | 131 | 119 | 129 | 121 | 113 | 105 | 83 | 77 | 68 | 63 | 58 | 53 | 49 | 41 | 35 | 30 | 27 | 24 |
| Percentage of PartnersCapitalAccountDistributions | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2019-12-31 | 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 | 161 | 161 | 161 | 107 | 107 | 104 | 100 | 93 | 89 | 85 | 81 | 77 | 62 | 59 | 53 | 51 | 30 | 29 | 27 | 23 | 18 | 15 | 14 | 11 |
| Percentage of PartnersCapitalAccountDistributions | 100.0 | 100.0 | 100.0 | 66.0 | 66.0 | 74.3 | 76.3 | 78.2 | 69.4 | 70.7 | 72.0 | 73.7 | 75.2 | 77.1 | 79.0 | 81.1 | 51.9 | 53.8 | 55.9 | 55.2 | 52.7 | 50.8 | 51.6 | 49.0 |
| 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 |
| Value | 0.0 | 0.0 | 0.0 | 55 | 55 | 36 | 31 | 26 | 39 | 35 | 31 | 27 | 20 | 17 | 14 | 12 | 9.5 | 7.1 | 4.7 | 2.9 | 1.9 | 1.0 | 0.6 | 0.5 |
| Percentage of PartnersCapitalAccountDistributions | 0.0 | 0.0 | 0.0 | 34.0 | 34.0 | 25.7 | 23.7 | 21.8 | 30.6 | 29.3 | 28.0 | 26.3 | 24.8 | 22.9 | 21.0 | 18.9 | 16.2 | 13.2 | 9.6 | 7.0 | 5.4 | 3.3 | 2.2 | 2.1 |
| Period End | 2021-06-30 |
| Value | 9.0 |
| Percentage of PartnersCapitalAccountExchangesAndConversions | 100.0 |
| Period End | 2021-06-30 |
| Value | 31 |
| Percentage of PartnersCapitalAccountExchangesAndConversions | 344.4 |
| Period End | 2021-06-30 |
| Value | -22.0 |
| Percentage of PartnersCapitalAccountExchangesAndConversions | -244.4 |
| 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 | 3.0 | 4.0 | 3.0 | 2.0 | 2.0 | 4.0 | 4.0 | 3.0 | 4.0 | 2.0 | 2.7 | 2.7 | 1.8 | 1.9 | 2.2 | 2.7 | 2.6 | 2.5 |
| Percentage of PaymentsOfDividendsMinorityInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2019-12-31 | 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 |
| Value | 1.0 | 1.0 | 2.0 | 1.0 | 0.0 | 1.0 | 2.0 | 1.0 | 2.6 | 1.8 | 2.9 | 0.0 | 0.3 | 2.0 | 3.4 | 3.2 | 3.2 | 2.7 | 2.0 | 12 | 11 | 15 | 15 |
| Percentage of PaymentsOfDividendsMinorityInterest | 33.3 | 50.0 | 100.0 | 25.0 | 0.0 | 33.3 | 50.0 | 50.0 | 96.3 | 66.7 | 161.1 | 0.0 | 13.6 | 74.1 | 130.8 | 128.0 | 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 | 2019-03-31 | 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 | 128 | 123 | 129 | 142 | 135 | 135 | 125 | 130 | 83 | 84 | 88 | 77 | 51 | 73 | 42 | 38 | 43 | 35 | 24 | 31 | 26 | 24 | 23 | 13 | 15 |
| Percentage of ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 7.0 | 1.0 | 8.0 | 7.0 | 5.0 |
| Percentage of ProceedsFromInterestReceived | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2019-09-30 | 2019-06-30 | 2019-03-31 | 2018-09-30 | 2018-06-30 | 2018-03-31 | 2017-12-31 | 2017-09-30 | 2016-12-31 | 2016-09-30 | 2015-12-31 | 2015-09-30 |
| Value | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 973 | -277.9 | 275 | 0.0 | 0.0 | -0.3 | 0.0 |
| Percentage of ProceedsFromIssuanceOfPrivatePlacement | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 100.0 | 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 |
| Value | 18 | 12 | 29 | 30 | 18 | 14 | 10.0 | 9.0 | 39 | 8.0 | 7.0 | 8.6 | 21 | 11 | 5.9 | 3.9 | 2.4 | 6.0 | 5.4 | 1.6 | 3.9 | 4.1 | 2.3 | -0.9 | 2.2 | 3.2 |
| Percentage of ProceedsFromLimitedPartnershipInvestments | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 1000000.0 | 8000000.0 | 1000000.0 | 1000000.0 | 1000000.0 |
| Percentage of ProceedsFromRepaymentsOfRelatedPartyDebt | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-04-29 |
| Value | 2000000.0 |
| Percentage of ProceedsFromSaleOfProductiveAssets | 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 |
| Value | 12 | 10.0 | 9.0 | 11 | 17 | 12 | 12 | 14 | 12 | 11 | 12 | 12 | 13 | 12 | 22 | 8.6 | 8.2 | 6.4 | 5.8 | 5.7 | 5.9 | 5.7 | 9.9 | 4.9 | 4.8 | 5.0 | 4.3 | 2.5 | 2.8 | 2.6 |
| Percentage of RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 1000000.0 | 1000000.0 | 5000000.0 |
| Percentage of SeveranceCosts1 | 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 |
| Value | 6.0 | 5.0 | 5.0 | 6.0 | 4.0 | 5.0 | 3.0 | 5.0 | 5.0 | 4.0 | 3.4 | 2.5 | 4.5 | 5.5 | 6.2 | 3.6 | 3.4 | 2.8 | 1.8 | 1.3 | 1.9 | 3.2 | 0.4 | 0.7 | 3.2 | 3.2 | 1.2 | 1.2 | 1.0 | 1.0 |
| Percentage of TaxesExcludingIncomeAndExciseTaxes | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 |
| Value | 393 | 393 | 13 | 393 | 393 | 0.8 | 75 | 75 | 67 |
| Percentage of WeightedAverageLimitedPartnershipAndGeneralPartnershipUnitsOutstandingBasic | 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 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 |
| Value | 269 | 269 | 269 | 269 | 109 | 109 | 102 | 100 | 100 | 100 | 95 | 89 | 89 | 88 | 0.0 | 21 | 21 | 21 | 0.0 | 21 | 21 | 21 |
| Percentage of WeightedAverageLimitedPartnershipUnitsOutstanding | 100.0 | 100.0 | 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 | 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 | 2016-12-31 | 2016-09-30 | 2016-06-30 | 2016-03-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2015-03-31 |
| Value | 123 | 123 | 123 | 123 | 123 | 123 | 123 | 123 | 123 | 123 | 113 | 90 | 88 | 88 | 2.7 | 88 | 81 | 63 | 0.8 | 53 | 53 | 46 |
| Percentage of WeightedAverageLimitedPartnershipUnitsOutstanding | 45.9 | 45.9 | 45.9 | 45.9 | 113.1 | 113.1 | 120.7 | 123.8 | 123.8 | 123.8 | 119.0 | 101.3 | 99.3 | 99.4 | 0.0 | 410.7 | 377.2 | 294.9 | 0.0 | 249.8 | 249.8 | 214.0 |
| 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 | 2015-12-31 | 2015-09-30 |
| Value | 320 | 320 | 17 | 320 | 320 | 109 | 1.3 | 109 | 102 | 0.0 | 21 |
| Percentage of WeightedAverageLimitedPartnershipUnitsOutstandingDiluted | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2015-12-31 | 2015-09-30 |
| Value | 123 | 123 | 0.0 | 123 | 123 | 123 | 0.0 | 123 | 123 | 3.0 | 53 |
| Percentage of WeightedAverageLimitedPartnershipUnitsOutstandingDiluted | 38.7 | 38.7 | 0.0 | 38.7 | 38.7 | 113.1 | 0.0 | 113.1 | 120.7 | 0.0 | 249.8 |
| 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 | 2013-12-31 |
| Value | 4.0 | 6.0 | 6.0 | 4.0 | 5.0 | 7.0 | 7.0 | 5.0 | 6.7 | 5.8 | 15 | 21 | 6.0 | 7.8 | 6.0 | 9.5 | 3.5 | 1.7 | 0.4 | 2.4 | 3.0 | 1.1 | 1.1 | 0.7 | 0.6 | 0.3 | 27 |
| Percentage of AccrualForTransportationAndProjectEngineering | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 14 | 12 | 16 | 15 | 16 | 17 | 18 | 18 | 16 | 14 | 14 | 13 | 11 | 5.3 | 6.6 | 5.5 | 5.6 | 2.9 | 2.6 | 1.3 |
| Percentage of AccruedInterestRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2013-12-31 |
| Value | 19 | 16 | 28 | 17 | 20 | 17 | 19 | 19 | 17 | 15 | 15 | 14 | 11 | 5.9 | 7.2 | 5.9 | 6.2 | 6.2 | 5.1 | 5.6 | 2.6 | 2.8 | 3.6 | 1.3 | 1.3 | 2.1 | 1.4 | 0.4 | 0.0 |
| Percentage of AccruedLiabilitiesRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| 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 |
| Value | 18 | 14 | 9.0 | 7.0 | 5.0 | 4.0 | 12 | 13 | 13 | 11 | 12 | 15 | 18 | 12 | 12 | 10 | 8.3 | 7.9 | 9.0 | 7.8 | 5.0 | 4.6 | 4.2 | 4.6 | 3.3 | 3.1 | 3.4 | 7.3 | 10.0 |
| Percentage of AllowanceOil | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 8.0 | 11 | 4.0 |
| Percentage of ContractWithCustomerAmortizationReminderOfFiscalYear | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | 15 | 15 | 17 | 17 |
| Percentage of ContractWithCustomerAmortizationYearFive | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | 16 | 16 | 15 | 15 |
| Percentage of ContractWithCustomerAmortizationYearOne | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | 17 | 17 | 16 | 16 |
| Percentage of ContractWithCustomerAmortizationYearThree | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 19 | 0.0 | 2.6 | 13 |
| Percentage of ContractWithCustomerLiabilityRelatedPartiesCurrent | 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 | 2013-12-31 |
| Value | 18 | 22 | 19 | 14 | 4.0 | 1.0 | 0.0 | 0.0 | 0.0 | 1.0 | 3.0 | 4.3 | 6.7 | 8.5 | 13 | 20 | 15 | 14 | 7.9 | 1.5 | 2.2 | 2.0 | 3.6 | 6.2 | 9.3 | 9.3 | 4.7 | 2.9 | 0.0 |
| Percentage of DeferredRevenueRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 | 2017-12-31 |
| Value | 1.0 | 0.01 | 0.01 | 0.01 |
| Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValuePercent | 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 | 2018-12-31 |
| Value | 9000000.0 | 8000000.0 | 8000000.0 | 7000000.0 | 7000000.0 | 7000000.0 | 6000000.0 | 6000000.0 | 5000000.0 |
| Percentage of FinanceLeaseAccumulatedDepreciation | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 8000000.0 |
| Percentage of FinanceLeaseLiabilityPaymentsDueExecutoryCosts | 100.0 |
| Period End | 2020-12-31 |
| Value | 24 |
| Percentage of FinanceLeaseLiabilityPaymentsDuePrincipalAmount | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 20 | 21 |
| Percentage of LeaseRightOfUseAsset | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 2000000.0 |
| Percentage of LesseeOperatingLeasePaymentsDueRelatedToOptionsToExtend | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 |
| Value | 210 | 220 | 219 |
| Percentage of LessorOperatingLeasePaymentToBeReceivedYearFourAndFive | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-09-30 |
| Value | 210 | 220 | 219 |
| Percentage of LessorOperatingLeasePaymentToBeReceivedYearTwoAndThree | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 220 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedFourToFiveYears | 100.0 |
| Period End | 2020-12-31 |
| Value | 366 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedRelatedToOptionsToExtend | 100.0 |
| Period End | 2020-12-31 |
| Value | 220 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoToThreeYears | 100.0 |
| Period End | 2020-12-31 |
| Value | 29 |
| Percentage of OperatingAndFinanceLeaseLiabilities | 100.0 |
| Period End | 2020-12-31 |
| Value | 56 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDue | 100.0 |
| Period End | 2020-12-31 |
| Value | 33 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDueAfterYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 4000000.0 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDueNextTwelveMonths | 100.0 |
| Period End | 2020-12-31 |
| Value | 5000000.0 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDueYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 5000000.0 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDueYearFour | 100.0 |
| Period End | 2020-12-31 |
| Value | 4000000.0 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDueYearThree | 100.0 |
| Period End | 2020-12-31 |
| Value | 5000000.0 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsDueYearTwo | 100.0 |
| Period End | 2020-12-31 |
| Value | 27 |
| Percentage of OperatingAndFinanceLeaseLiabilitiesPaymentsUndiscountedExcessAmount | 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 | 2018-12-31 |
| Value | 148 | 150 | 147 | 143 | 139 | 136 | 133 | 131 | 121 |
| Percentage of OperatingLeaseAccumulatedDepreciation | 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 | 2015-12-31 |
| Value | 5.0 | 4.0 | 12 | 2.0 | 4.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.4 | 0.6 | 0.5 | 0.6 | 0.6 | 0.4 | 0.6 | 1.9 | 0.9 | 0.5 |
| Percentage of OtherAccruedLiabilitiesRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 7.0 | 14 | 22 | 10.0 | 6.0 | 11 | 15 | 2.0 | 6.0 | 11 | 15 | 1.4 | 4.9 | 8.5 | 11 | 0.6 | 3.2 |
| Percentage of PrepaidExpensesRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 666 | 680 | 695 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetExcludingConstructionInProgress | 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 | 2013-12-31 |
| Value | 695 | 699 | 691 | 703 | 699 | 692 | 681 | 687 | 663 | 670 | 672 | 683 | 692 | 574 | 577 | 374 | 377 | 371 | 371 | 377 | 382 | 268 | 264 | 267 | 264 | 245 | 216 |
| Percentage of PropertyPlantAndEquipmentExcludingConstructionInProgress | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2013-12-31 |
| Value | 14 | 12 | 16 | 20 | 21 | 8.0 | 10.0 | 10.0 | 8.0 | 9.0 | 8.9 | 10 | 12 | 9.7 | 11 | 10 | 11 | 5.7 | 5.2 | 5.7 | 4.1 | 8.5 | 9.3 | 5.9 | 4.8 | 4.3 | 10 | 4.9 | 0.0 |
| Percentage of AccountsPayableRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| 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 |
| Value | 33 | 31 | 21 | 40 | 36 | 32 | 29 | 30 | 39 | 29 | 28 | 35 | 24 | 23 | 23 | 16 | 23 | 13 | 10 | 7.2 | 6.7 | 8.1 | 9.8 | 3.8 | 7.7 | 4.2 | 10 | 13 | 11 |
| Percentage of AccountsReceivableRelatedPartiesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2019-12-31 | 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 |
| Value | 5.0 | 13 | 9.0 | 5.0 | 4.0 | 13 | 9.0 | 5.0 | 3.9 | 11 | 9.2 | 8.4 | 4.2 | 7.2 | 4.5 | 2.1 | 0.6 | 4.9 | 4.2 | 2.8 | 0.3 | 6.0 | 5.8 | 2.9 | 0.2 | 1.0 | 0.6 |
| Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2013-12-31 |
| Value | 46 | 47 | 47 | 47 | 47 | 40 | 40 | 40 | 40 | 40 | 39 | 39 | 38 | 38 | 38 | 37 | 30 | 20 | 20 | 19 | 19 | 19 | 19 | 10 | 10 | 10 | 10 | 8.2 | 8.2 |
| Percentage of BuildingsAndImprovementsGross | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 320 | 289 | 207 |
| Percentage of CashUninsuredAmount | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-01-01 | 2019-12-31 |
| Value | 225 | 229 | 233 | 237 | 240 | 0.0 | 0.0 |
| Percentage of ContractWithCustomerAssetGrossCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 225 | 229 | 233 |
| Percentage of ContractWithCustomerAssetGrossCurrent | 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 | 2017-12-31 |
| Value | 3000000.0 | 3000000.0 | 3000000.0 | 3000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 2000000.0 | 2600000.0 | 2600000.0 |
| Percentage of ContractWithCustomerLiabilityNoncurrent | 100.0 | 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 | 2018-12-31 |
| Value | 2694 | 2694 | 2694 | 2694 | 2694 | 2694 | 2694 | 2694 | 2094 |
| Percentage of DebtInstrumentCarryingAmount | 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 | 2.26 | 0.0376 |
| Percentage of DebtWeightedAverageInterestRate | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 2.06 | 0.0357 |
| Percentage of DebtWeightedAverageInterestRate | 91.2 | 94.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2015-12-31 | 2015-09-30 | 2015-06-30 | 2014-12-31 |
| Value | 296 | 297 | 298 | 300 | 301 | 0.0 | 13 | 5.2 | 9.1 | 12 |
| Percentage of DueFromRelatedParties | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 0.0 | 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 | 2014-11-03 |
| Value | 80 | 82 | 84 | 86 | 88 | 90 | 92 | 94 | 97 | 39 | 40 | 41 | 42 | 40 | 41 | 28 | 29 | 29 | 30 | 15 | 5.8 | 5.9 |
| Percentage of EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2019-09-30 |
| Value | 16.125 | 0.16125 | 0.16125 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 100.0 | 100.0 | 100.0 |
| Period End | 2020-09-30 | 2020-06-30 | 2019-09-30 |
| Value | 38.59 | 0.3859 | 0.3859 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 239.3 | 239.3 | 239.3 |
| Period End | 2020-12-31 | 2019-12-31 | 2019-06-30 |
| Value | 16.125 | 0.16125 | 0.16125 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2019-06-30 |
| Value | 38.59 | 0.3859 | 0.3859 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 75.0 | 0.75 | 0.75 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 50.0 | 0.5 | 0.5 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 |
| Value | 50.0 | 50.0 | 50.0 | 50.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.49 | 0.49 | 0.49 | 0.49 | 0.49 | 0.49 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 310.1 | 310.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2019-12-31 | 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 | 1.0 | 1.0 | 1.0 | 1.0 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 6.2 | 6.2 | 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 | 2019-12-31 | 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 | 16.125 | 16.125 | 16.125 | 16.125 | 0.16125 | 0.16125 | 0.16125 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 | 0.06 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 100.0 | 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 |
| Value | 50.0 | 0.5 | 0.5 | 0.5 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 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 | 2019-12-31 | 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 | 10.0 | 10.0 | 10.0 | 10.0 | 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 EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 62.0 | 62.0 | 0.0 | 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 | 2019-12-31 | 2019-06-30 | 2018-12-31 |
| Value | 38.59 | 38.59 | 38.59 | 38.59 | 0.3859 | 0.3859 | 0.3859 | 0.1262 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 239.3 | 239.3 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 41.48 | 41.48 | 41.48 | 41.48 | 0.4148 | 0.4148 | 0.4148 | 0.4148 | 0.4148 | 0.4148 | 0.4148 | 0.4148 | 0.4148 | 0.4148 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 257.2 | 257.2 | 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 | 2019-12-31 | 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 |
| Value | 71.5 | 71.5 | 71.5 | 71.5 | 0.715 | 0.715 | 0.715 | 0.715 | 0.715 | 0.715 | 0.715 | 0.715 | 0.715 | 0.486 | 0.486 | 0.486 | 0.486 | 0.286 | 0.286 | 0.286 | 0.286 | 0.286 | 0.286 | 0.286 | 0.286 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 443.4 | 443.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2019-12-31 |
| Value | 79.0 | 79.0 | 79.0 | 79.0 | 0.79 | 0 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 489.9 | 489.9 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 79.0 | 79.0 | 79.0 | 79.0 | 0.79 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 489.9 | 489.9 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 71.0 | 71.0 | 71.0 | 71.0 | 0.71 | 0.71 | 0.71 | 0.71 | 0.71 | 0.71 | 0.71 | 0.71 | 0.71 | 0.49 | 0.49 | 0.49 | 0.49 | 0 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 440.3 | 440.3 | 0.0 | 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 | 2019-12-31 | 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 | 50.0 | 50.0 | 50.0 | 50.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 310.1 | 310.1 | 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 | 2019-12-31 | 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 | 2015-07-01 |
| Value | 36.0 | 36.0 | 36.0 | 36.0 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 | 0.36 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 223.3 | 223.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 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 | 2019-12-31 | 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 | 10.0 | 10.0 | 10.0 | 10.0 | 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 EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 62.0 | 62.0 | 0.0 | 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 | 2019-12-31 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 |
| Value | 75.0 | 75.0 | 75.0 | 75.0 | 0.75 | 0.75 | 0.75 | 0.75 | 0.75 | 0.75 | 0.75 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 465.1 | 465.1 | 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 | 2019-12-31 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 |
| Value | 50.0 | 50.0 | 50.0 | 50.0 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 310.1 | 310.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Period End | 2021-05-01 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 100.0 | 92.5 | 92.5 | 92.5 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 | 0.925 |
| Percentage of EquityMethodInvestmentOwnershipPercentage | 0.0 | 0.0 | 0.0 | 573.6 | 573.6 | 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 | 2013-12-31 |
| Value | 996 | 1007 | 1013 | 1045 | 1069 | 912 | 926 | 926 | 930 | 814 | 822 | 819 | 820 | 345 | 362 | 253 | 255 | 256 | 262 | 174 | 177 | 181 | 185 | 186 | 155 | 157 | 160 | 0.0 |
| 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 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-06-30 | 2019-03-31 | 2018-12-31 | 2018-09-30 | 2018-06-30 | 2017-12-31 |
| Value | 367 | 376 | 382 | 395 | 414 | 426 | 441 | 444 | 458 | 462 | 465 | 0.0 |
| Percentage of EquityMethodInvestments | 36.8 | 37.3 | 37.7 | 37.8 | 38.7 | 46.0 | 47.4 | 54.5 | 55.7 | 56.5 | 56.7 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 |
| Value | 86 | 89 | 88 | 89 | 88 | 88 | 84 | 84 | 81 | 80 | 80 | 80 | 79 | 78 | 77 | 76 | 76 | 76 | 74 | 74 | 75 | 74 | 73 | 72 | 75 |
| Percentage of EquityMethodInvestments | 8.6 | 8.8 | 8.7 | 8.5 | 8.2 | 9.5 | 9.0 | 10.3 | 9.9 | 9.9 | 9.8 | 23.2 | 22.0 | 30.8 | 30.5 | 29.9 | 29.0 | 44.0 | 41.9 | 41.1 | 40.9 | 39.7 | 47.4 | 46.3 | 46.7 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-06-30 | 2018-12-31 |
| Value | 38 | 31 | 29 | 28 | 28 | 30 | 30 | 0.0 |
| Percentage of EquityMethodInvestments | 3.8 | 3.1 | 2.9 | 2.7 | 2.6 | 3.2 | 3.2 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 20 | 20 | 20 | 0.0 |
| Percentage of EquityMethodInvestments | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.9 | 1.9 | 2.2 | 2.2 | 2.3 | 2.3 | 5.6 | 5.4 | 7.8 | 7.8 | 7.9 | 7.9 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2019-06-30 | 2018-12-31 |
| Value | 69 | 70 | 73 | 79 | 84 | 88 | 92 | 0.0 |
| Percentage of EquityMethodInvestments | 6.9 | 7.0 | 7.2 | 7.6 | 7.9 | 9.5 | 9.9 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 15 | 14 | 12 | 12 | 10.0 | 9.0 | 8.0 | 9.0 | 8.2 | 8.4 | 8.4 | 7.5 | 6.9 | 4.0 |
| Percentage of EquityMethodInvestments | 1.5 | 1.4 | 1.2 | 1.1 | 0.9 | 1.0 | 0.9 | 1.1 | 1.0 | 1.0 | 1.0 | 2.2 | 1.9 | 1.5 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 |
| Value | 149 | 153 | 152 | 156 | 153 | 161 | 162 | 167 | 168 | 166 | 168 | 173 | 187 | 129 | 129 | 128 | 130 | 81 | 84 | 85 | 84 | 84 | 81 | 84 | 85 |
| Percentage of EquityMethodInvestments | 15.0 | 15.2 | 15.0 | 14.9 | 14.3 | 17.4 | 17.4 | 20.5 | 20.5 | 20.3 | 20.6 | 50.1 | 51.7 | 51.1 | 50.7 | 50.0 | 49.6 | 46.7 | 47.4 | 46.7 | 45.4 | 45.3 | 52.6 | 53.7 | 53.3 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 |
| Value | 160 | 161 | 163 | 166 | 171 | 0.0 |
| Percentage of EquityMethodInvestments | 16.1 | 16.0 | 16.1 | 15.9 | 16.0 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 82 | 82 | 83 | 88 | 89 | 91 | 79 | 76 | 72 | 66 | 61 | 48 | 49 | 0.0 |
| Percentage of EquityMethodInvestments | 8.2 | 8.1 | 8.2 | 8.4 | 8.3 | 9.8 | 8.5 | 9.3 | 8.8 | 8.1 | 7.5 | 14.0 | 13.6 | 0.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 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 | 13 | 14 | 14 | 14 | 14 | 15 | 16 | 16 | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 18 | 19 | 0.0 |
| Percentage of EquityMethodInvestments | 1.3 | 1.4 | 1.4 | 1.3 | 1.3 | 1.6 | 1.7 | 2.0 | 2.0 | 2.0 | 2.0 | 4.9 | 4.8 | 6.9 | 7.0 | 7.1 | 7.3 | 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 | 2018-09-30 | 2017-12-31 |
| Value | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 2.0 | 62 | 62 | 62 |
| Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount | 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 |
| Value | 2.0 | 2.0 | 2.1 | 2.1 |
| Percentage of EquitySecuritiesWithoutReadilyDeterminableFairValueAmount | 100.0 | 100.0 | 3.4 | 3.4 |
| Period End | 2020-12-31 |
| Value | 25 |
| Percentage of FinanceLeaseLiability | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2019-12-31 | 2019-09-30 | 2019-06-30 | 2019-03-31 |
| Value | 2000000.0 | 2000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 | 1000000.0 |
| Percentage of FinanceLeaseLiabilityCurrent | 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 |
| Value | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 |
| Percentage of FinanceLeaseLiabilityNoncurrent | 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 | 49 |
| Percentage of FinanceLeaseLiabilityPaymentsDue | 100.0 |
| Period End | 2020-12-31 |
| Value | 28 |
| Percentage of FinanceLeaseLiabilityPaymentsDueAfterYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 4000000.0 |
| Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths | 100.0 |
| Period End | 2020-12-31 |
| Value | 5000000.0 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearFive | 100.0 |
| Period End | 2020-12-31 |
| Value | 4000000.0 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearFour | 100.0 |
| Period End | 2020-12-31 |
| Value | 4000000.0 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearThree | 100.0 |
| Period End | 2020-12-31 |
| Value | 4000000.0 |
| Percentage of FinanceLeaseLiabilityPaymentsDueYearTwo | 100.0 |
| Period End | 2020-12-31 |
| Value | 24 |
| Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 16 | 17 |
| Percentage of FinanceLeaseRightOfUseAsset | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 |
| Value | 8000000.0 | 6000000.0 |
| Percentage of FinanceLeaseRightOfUseAssetAccumulatedAmortization | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2019-12-31 |
| Value | 646 | 707 | 731 | 756 | 831 |
| Percentage of LessorOperatingLeasePaymentsToBeReceived | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 735 |
| Percentage of LessorOperatingLeasePaymentsToBeReceived | 100.5 |
| Period End | 2020-12-31 |
| Value | 56 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedFiveYears | 100.0 |
| Period End | 2020-12-31 |
| Value | 56 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedFourYears | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2019-12-31 |
| Value | 105 | 111 | 56 | 110 | 56 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 111 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths | 198.2 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2019-12-31 |
| Value | 121 | 156 | 451 | 208 | 551 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2020-12-31 |
| Value | 184 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedThereafter | 40.8 |
| Period End | 2020-12-31 |
| Value | 56 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedThreeYears | 100.0 |
| Period End | 2020-12-31 |
| Value | 56 |
| Percentage of LessorOperatingLeasePaymentsToBeReceivedTwoYears | 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 | 2013-12-31 |
| Value | -2468.0 | -2498.0 | -2497.0 | -2474.0 | -2456.0 | -214.0 | -203.0 | -196.0 | -198.0 | -196.0 | -198.0 | -205.1 | -219.0 | -219.7 | -507.2 | -510.2 | -509.1 | -508.9 | -124.1 | -125.6 | -126.1 | -128.2 | -130.4 | -133.9 | -137.8 | -138.8 | -140.3 | 0.0 |
| Percentage of LimitedPartnersCapitalAccount | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 | 2014-12-31 |
| Value | 3363 | 3373 | 3382 | 3402 | 3421 | 3450 | 1016 |
| Percentage of LimitedPartnersCapitalAccount | -136.3 | -135.0 | -135.4 | -137.5 | -139.3 | -1699.5 | -724.3 |
| 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 | 2014-12-31 |
| Value | 2691 | 2691 | 2692 | 2692 | 2692 | 2692 | 2692 | 2691 | 2691 | 2091 | 2090 | 2090 | 2091 | 871 | 1844 | 1000 | 1265 | 685 | 686 | 343 | 344 | 47 | 458 | 420 | 0.0 |
| Percentage of LineOfCredit | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| 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 |
| Value | 600 | 600 | 600 | 600 | 600 | 600 | 600 | 600 | 600 | 0.0 |
| Percentage of LineOfCredit | 22.3 | 22.3 | 22.3 | 22.3 | 22.3 | 22.3 | 22.3 | 22.3 | 22.3 | 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 | 866 | 896 | 896 | 896 | 896 | 896 | 896 | 896 | 896 | 896 | 896 | 896 | 296 | 1516 | 543 | 283 |
| Percentage of LineOfCreditFacilityRemainingBorrowingCapacity | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2018-12-31 |
| Value | 2898 | 2879 | 2928 | 2919 | 2891 | 2790 | 2825 | 2819 | 2099 |
| Percentage of LongTermDebtFairValue | 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 | 2018-12-31 | 2017-12-31 |
| Value | 29.0 | 29.0 | 29.0 | 29.0 | 0.29 | 0.29 | 0.29 | 0.29 | 0.29 | 0.29 |
| Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| Period End | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2020-03-31 | 2019-12-31 | 2019-09-30 | 2018-12-31 | 2017-12-31 |
| Value | 7.5 | 7.5 | 7.5 | 0.075 | 0.075 | 0.075 | 0.075 | 0.075 | 0.075 |
| Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners | 25.9 | 25.9 | 25.9 | 25.9 | 25.9 | 25.9 | 25.9 | 25.9 | 25.9 |
| Period End | 2020-12-31 | 2020-06-30 | 2020-03-31 |
| Value | 2.0 | 2.0 | 0.02 |
| Percentage of MinorityInterestOwnershipPercentageByNoncontrollingOwners | 6.9 | 689.7 | 6.9 |
| Period End | 2021-04-30 |
| Value | 7.5 |
| Percentage of MinorityInterestOwnershipPercentageByParent | 100.0 |
| Period End | 2021-04-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 |
| Value | 92.5 | 7.5 | 7.5 | 7.5 |
| Percentage of MinorityInterestOwnershipPercentageByParent | 1233.3 | 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 | 2014-12-31 |
| Value | 2691 | 2691 | 2692 | 2692 | 2692 | 2692 | 2692 | 2691 | 2691 | 2091 | 2090 | 2090 | 2091 | 871 | 1844 | 1000 | 1265 | 685 | 686 | 343 | 344 | 47 | 458 | 0.0 |
| Percentage of NotesPayableRelatedPartiesNoncurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| 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 |
| Value | -469.0 | -490.0 | -481.0 | -437.0 | -403.0 | -799.0 | -775.0 | -783.0 | -792.0 | -281.0 | -282.4 | -307.1 | -343.3 | 387 | -589.2 | 3.4 | -273.4 | 116 | 98 | 378 | 370 | 547 | 98 | 52 | 345 | 426 | 417 | 303 | 214 |
| Percentage of PartnersCapital | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2013-12-31 |
| Value | 2.0 | 23 | 23 | 23 | 24 | 25 | 26 | 26 | 25 | 27 | 25 | 23 | 22 | 22 | 23 | 20 | 20 | 20 | 21 | 22 | 22 | 108 | 108 | 104 | 99 | 154 | 161 | 0.0 |
| Percentage of PartnersCapitalAttributableToNoncontrollingInterest | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 | 2019-12-31 |
| Value | -1059000000.0 | -1059000000.0 | -1059000000.0 | -1059000000.0 | -1059000000.0 | 0 |
| Percentage of PreferredUnitsPreferredPartnersCapitalAccounts | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2013-12-31 |
| Value | 8.0 | 16 | 24 | 10.0 | 6.0 | 13 | 16 | 2.0 | 6.0 | 11 | 15 | 1.5 | 5.2 | 8.8 | 12 | 1.2 | 4.5 | 6.5 | 6.0 | 0.7 | 1.8 | 3.4 | 5.0 | 1.3 | 1.4 | 2.5 | 3.6 | 2.0 |
| Percentage of PrepaidExpenseCurrent | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 666 | 674 | 661 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 673 | 686 | 699 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization | 100.0 | 100.0 | 100.0 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 |
| Value | 1332 | 1354 | 1356 |
| Percentage of PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization | 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 |
| Value | 35 | 35 | 34 | 34 | 34 | 33 | 33 | 19 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 15 | 17 | 6.7 | 6.0 | 5.9 | 5.9 | 6.0 | 5.6 | 5.5 | 5.5 | 5.5 | 5.5 | 5.2 | 5.2 |
| Percentage of PropertyPlantAndEquipmentOther | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 |
| Value | 2247 | 2328 | 2366 | 2426 | 2494 | 978 | 1016 | 1029 | 1069 | 968 | 1005 | 1060 | 129 | 188 |
| Percentage of RevenueRemainingPerformanceObligation | 100.0 | 100.0 | 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 |
| Value | 442 | 457 | 497 | 525 | 553 | 605 | 632 | 517 | 590 | 102 | 147 |
| Percentage of RevenueRemainingPerformanceObligation | 19.7 | 19.6 | 20.5 | 21.1 | 56.5 | 58.8 | 59.1 | 53.4 | 55.7 | 78.8 | 78.1 |
| Period End | 2021-06-30 | 2021-03-31 | 2020-12-31 | 2020-09-30 | 2020-06-30 |
| Value | 1464 | 1489 | 1508 | 1533 | 1559 |
| Percentage of RevenueRemainingPerformanceObligation | 65.2 | 64.0 | 63.7 | 63.2 | 62.5 |
| 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 |
| Value | 23 | 26 | 18 | 19 | 20 | 1.0 | 2.0 | 3.0 | 5.0 | 2.0 | 3.0 |
| Percentage of RevenueRemainingPerformanceObligation | 1.0 | 1.1 | 0.7 | 0.8 | 2.0 | 0.1 | 0.2 | 0.3 | 0.5 | 1.5 | 1.6 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 17 | 21 | 4.0 |
| Percentage of RevenueRemainingPerformanceObligation | 0.7 | 2.1 | 0.4 |
| 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 |
| Value | 286 | 323 | 335 | 342 | 354 | 366 | 378 | 383 | 394 | 406 | 416 | 418 | 22 | 34 |
| Percentage of RevenueRemainingPerformanceObligation | 12.7 | 13.9 | 14.2 | 14.1 | 14.2 | 37.4 | 37.2 | 37.2 | 36.9 | 41.9 | 41.4 | 39.5 | 17.6 | 18.2 |
| 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 |
| Value | 32 | 33 | 472 | 36 | 37 | 39 | 577 | 40 | 41 | 42 | 539 | 46 | 2.7 | 4.1 |
| Percentage of RevenueRemainingPerformanceObligation | 1.4 | 1.4 | 19.9 | 1.5 | 1.5 | 4.0 | 56.8 | 3.9 | 3.8 | 4.3 | 53.7 | 4.4 | 2.1 | 2.2 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 34 | 40 | 45 |
| Percentage of RevenueRemainingPerformanceObligation | 1.4 | 3.9 | 4.5 |
| 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 |
| Value | 3000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 3000000.0 | 3000000.0 | 3300000.0 | 3500000.0 | 2500000.0 | 2700000.0 | 2900000.0 | 1300000.0 | 1500000.0 | 1600000.0 | 900000.0 | 1000000.0 | 500000.0 | 500000.0 | 600000.0 |
| Percentage of UnamortizedDebtIssuanceExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 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 | 2017-12-31 |
| Value | 3000000.0 | 3000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 2000000.0 | 3000000.0 | 3000000.0 | 3000000.0 | 3000000.0 | 3500000.0 | 2900000.0 |
| Percentage of UnamortizedDebtIssuanceExpense | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 90.9 | 100.0 | 100.0 |
| Period End | 2020-12-31 | 2019-12-31 | 2018-12-31 |
| Value | 1000000.0 | 5000000.0 | 8000000.0 |
| Percentage of UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount | 100.0 | 100.0 | 100.0 |
