TNC

Line plots across dimensions of each concept
Line plots across concepts
Tables

Plots across concepts

IncomeStatement

Expenses

Balance Sheet

Assets

Current Assets

NonCurrent Assets

PropertyPlantAndEquipmentNet

Liabilities

Current Liabilities

Noncurrent Liabilities

Stockholders Equity

Per Share

CashFlow

NetCashProvidedByUsedInOperatingActivities

NetCashProvidedByUsedInInvestingActivities

NetCashProvidedByUsedInFinancingActivities

OperatingLeaseLiability

NonoperatingIncomeExpense

LesseeOperatingLeaseLiabilityPaymentsDue

FiniteLivedIntangibleAssets

AccountsReceivable

Tables

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:CommonStockValue	▇▇▅▅▅▅▅▄▄▄▄▄▄▃▃▂▂▂▂▁▁▁▂▂▅▅▅▅▅▆▆▅▅▅▆▆▆██▇█	7.0	7.0	6.9	6.9	6.9	6.9	6.9	6.8	6.8	6.8	6.797	6.796	6.778	6.717	6.705	6.69	6.684	6.658	6.633	6.611	6.592	6.624	6.654	6.689	6.848	6.901	6.906	6.903	6.894	6.919	6.934	6.864	6.899	6.911	6.924	6.967	6.977	7.061	7.063	7.052	7.096	NA	7.14	NA	NA	NA
us-gaap:CommonStockSharesIssued		NA	NA	NA	18.473149	18.455462	18.434815	18.33601	18.254017	18.192486	18.160539	18.125201	18.122576	18.073713	17.91044	17.881177	17.840854	17.823292	17.754553	17.68835	17.629196	17.578267	17.662813	17.744381	17.837463	18.261832	18.403712	18.415047	18.408026	18.384306	18.45042	18.491524	18.466504	18.396275	18.430239	18.46445	18.578029	18.6061	18.803242	18.83494	18.805425	18.9229	NA	19.038843	NA	NA	NA
us-gaap:CommonStockSharesOutstanding		NA	NA	NA	18.473149	18.455462	18.434815	18.33601	18.254017	18.192486	18.160539	18.125201	18.122576	18.073713	17.91044	17.881177	17.840854	17.823292	17.754553	17.68835	17.629196	17.578267	17.662813	17.744381	17.837463	18.261832	18.403712	18.415047	18.408026	18.384306	18.45042	18.491524	18.466504	18.396275	18.430239	18.46445	18.578029	18.6061	18.803242	19.038843	18.805425	18.9229	NA	19.038843	NA	NA	NA
us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock		NA	NA	NA	18.473149	18.455462	18.434815	18.33601	18.254017	18.192486	18.160539	18.125201	18.122576	18.073713	17.91044	17.881177	NA	NA	NA	17.68835	NA	NA	NA	17.744381	NA	NA	NA	18.415047	NA	NA	NA	NA	NA	NA	NA	18.46445	NA	NA	NA	18.83494	NA	NA	NA	19.038843	NA	NA	NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding		NA	NA	NA	18.648328	18.584693	18.666238	NA	18.487948	18.394865	18.345211	NA	18.439621	18.371538	18.245359	NA	18.171444	17.693102	17.596546	NA	17.973206	17.933243	17.977587	NA	17.941171	18.67204	18.780934	NA	18.635287	18.675607	18.839172	NA	18.811638	18.78788	18.889317	NA	19.040875	19.203563	19.228272	NA	19.271074	19.467553	19.556036	NA	19.402902	19.302802	NA
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic		NA	NA	NA	18.371883	18.347189	18.286816	NA	18.134909	18.082492	18.042468	NA	17.998917	17.94345	17.790989	NA	17.729857	17.693102	17.596546	NA	17.498808	17.508022	17.544192	NA	17.941171	18.197431	18.283097	NA	18.120729	18.167054	18.31826	NA	18.267828	18.253326	18.343933	NA	18.468546	18.594207	18.722156	NA	18.741524	18.941131	18.963177	NA	18.873249	18.78953	NA
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount		NA	NA	NA	0.578858	0.818912	0.20668	NA	0.485853	0.688545	0.646491	NA	0.139106	0.186833	0.291622	NA	0.340239	0.735377	0.663306	NA	0.313711	0.408979	0.381952	NA	0.746206	0.237405	0.145293	NA	0.081874	0.154897	0.142168	NA	0.147737	0.278862	0.212968	NA	0.251704	0.253781	0.177414	NA	0.180551	0.17913	0.083368	NA	NA	NA	NA
us-gaap:EarningsPerShareBasic		NA	NA	NA	0.64	0.78	0.28	0.6	0.81	0.82	0.3	0.43	0.54	0.71	0.18	-0.18	0.2	-0.15	-0.22	0.88	0.66	0.88	0.25	0.74	-0.05	0.81	0.27	0.96	0.65	0.85	0.32	0.56	0.58	0.78	0.28	0.75	0.47	0.74	0.28	0.6	0.52	0.31	0.31	0.91	0.4	0.33	0.22
us-gaap:EarningsPerShareDiluted		NA	NA	NA	0.63	0.77	0.28	0.59	0.79	0.81	0.29	0.42	0.52	0.69	0.18	-0.18	0.2	-0.15	-0.22	0.85	0.64	0.85	0.25	0.73	-0.05	0.79	0.27	0.93	0.63	0.83	0.31	0.55	0.56	0.76	0.27	0.73	0.46	0.71	0.28	0.59	0.5	0.3	0.3	0.89	0.39	0.32	0.21

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
TTM Greenblatt ROC _ _	▅█▃▅▆▄▅▅▅▃▄▄▅▃▃▃▃▁▆▄▆▃▅▂▆▃▆▅▆▃▅▄▅▃▅▄▅▃▄▄▃▃	20.4	36.3	8.0	18.4	22.9	14.4	19.6	21.5	19.9	10.8	13.138	15.439	19.029	10.372	9.456	11.046	9.155	-2.613	22.588	16.254	22.559	7.097	17.765	4.57	22.587	8.254	22.615	17.104	23.141	9.237	17.669	16.229	21.622	6.883	18.97	13.801	21.597	8.335	15.452	15.763	10.238	8.192	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AllocatedShareBasedCompensationExpense	█▇▅▆▃▇▇█▅▇▆▆▅▇▄▅▅▆▁▅▅▆▅▅▆▇▆▅▆▅▄▅▅▅▆▇▆▅▅▅▅▅	3.9	3.1	1.3	1.9	0.0	2.8	2.7	3.7	1.7	3.3	2.306	1.893	1.367	2.748	0.976	1.293	1.049	2.573	-1.872	1.321	1.789	2.637	1.642	1.691	2.182	2.707	2.053	1.505	2.216	1.54	1.01	1.667	1.732	1.707	1.917	3.264	2.218	1.69	1.838	1.079	1.191	1.299	NA	NA	NA	NA
us-gaap:ComprehensiveIncomeNetOfTax	▆▆▅█▇▂▇▃▇▃▅▄▁▄▃▅▄▂▅▅▆▄▆▁▆▂▅▄▆▄▆▆▅▃	14.7	15.0	12.6	23.5	18.4	-2.4	19.8	3.4	17.2	4.1	8.757	6.834	-5.403	8.353	2.897	11.747	8.372	-1.611	9.39	11.904	15.753	7.773	14.825	-6.194	16.866	-2.945	8.937	4.852	16.366	6.874	15.885	13.405	12.4	3.903	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	▆▆▅█▇▂▇▃▆▃▄▄▁▄▃▅▄▂▅▅▆	14.7	15.0	12.6	23.5	18.4	-2.4	19.9	3.4	17.2	4.1	8.802	6.867	-5.381	8.379	2.915	11.784	8.307	-1.611	9.39	11.904	15.753	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	13.405	12.4	3.903	NA	10.415	9.897	7.745	NA	2.102	9.719	8.984	NA	NA	NA	NA
us-gaap:CostOfGoodsAndServicesSold	▇▆▇▆▃▅█▇█▆█▇█▇▇▆▇▂▃▃▃▂▃▃▃▂▃▃▃▂▂▂▂▁▂▂▂▁▂▂▃▂▂▁▁	164.2	150.0	164.7	157.1	123.4	148.0	176.1	166.7	178.9	154.3	177.7	165.17	173.398	162.21	163.768	157.317	166.237	111.323	118.237	114.839	121.539	102.362	118.564	116.145	120.371	107.659	123.193	115.48	123.821	107.062	111.358	106.679	112.497	95.569	104.044	100.705	110.542	98.393	109.629	106.737	117.791	100.66	105.626	96.775	94.594	NA
us-gaap:GainsLossesOnExtinguishmentOfDebt	▄	-11.3	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:GrossProfit	▇▇▆▆▄▆█▇█▆▇▆█▇▇▆▆▃▅▄▅▃▄▄▅▃▅▄▅▃▃▃▄▂▃▃▄▂▃▃▃▂▃▂▂▁	114.9	113.3	108.3	104.8	90.6	104.1	118.6	114.0	120.8	108.2	112.172	108.085	118.799	110.637	113.866	104.604	104.554	79.736	93.509	85.295	95.289	77.502	87.289	88.657	95.033	78.081	93.084	87.163	95.263	76.917	83.782	81.862	87.741	72.523	83.463	77.563	88.951	75.319	83.529	80.253	83.468	71.931	77.162	71.862	71.543	63.76
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	▃█▃▄▅▃▄▅▅▃▃▄▄▃▂▃▁▁▆▅▆▃▅▃▆▃▆▅▆▃▅▅▆▃▅▄▆▃▅▄▄▃▃▄▄	7.2	33.0	4.0	12.9	17.9	6.3	14.2	16.6	16.6	6.6	8.469	9.867	13.129	4.377	1.34	4.327	-2.418	-4.541	21.497	15.873	22.594	6.527	17.23	3.951	21.811	7.432	21.541	16.354	23.056	8.587	17.451	15.396	20.819	6.212	18.628	13.104	20.419	7.738	15.659	13.943	10.725	8.403	8.491	10.37	9.947	NA
us-gaap:IncomeTaxExpenseBenefit	▄█▅▅▆▅▆▆▆▅▅▅▅▅▇▅▅▄▇▇█▆▆▇█▆▆▇█▆█▇█▅▇▇█▆▇▇▇▆▁▆▆	-2.6	7.3	1.5	1.2	3.6	1.1	3.1	2.0	1.8	1.2	0.706	0.158	0.363	1.077	4.528	0.731	0.238	-0.584	6.127	4.396	7.266	2.088	4.034	4.902	6.994	2.406	4.0	4.562	7.533	2.792	7.15	4.779	6.565	1.153	4.784	4.359	6.748	2.414	4.395	4.215	4.87	2.537	-8.521	2.844	3.772	NA
us-gaap:IncomeTaxesPaid	▇▂▄▆▁▂█▆▃▄▄▂▄▂▅▄▂▄▃▇▂▂▅█▅▄▃▆▂▂▅▅▂▂▂▅▄▂▅▄▂▃▄▆	8.3	1.2	4.3	6.9	-0.1	0.9	9.1	7.0	2.2	3.4	3.818	1.589	4.066	1.659	5.415	3.276	1.562	3.289	2.843	8.155	1.465	1.709	5.369	9.35	4.729	3.973	3.068	6.629	0.902	0.743	5.365	5.259	1.894	0.94	1.244	4.925	4.214	1.18	5.048	4.24	1.005	2.865	4.036	6.197	NA	NA
us-gaap:InterestExpense	▂▄▄▄▄▄▄▄▄▄▄▄▄▄▅▅█▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	2.1	4.6	4.8	5.2	5.6	5.1	5.4	5.2	5.4	5.0	5.606	5.986	6.005	5.745	6.674	6.093	11.833	0.794	0.36	0.329	0.288	0.302	0.302	0.215	0.419	0.377	0.421	0.396	0.419	0.486	0.443	0.44	0.411	0.467	0.496	0.64	0.669	0.712	0.624	0.654	0.545	0.415	0.4	0.39	0.396	NA
us-gaap:InterestPaidNet	▇▁▆▁▇▁▇▁▇▁█	9.3	0.3	8.7	0.2	9.2	0.2	9.1	0.8	9.1	0.7	11.1	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NetIncomeLoss	▄█▃▅▅▃▅▅▅▃▄▄▅▃▁▃▁▁▆▅▆▃▅▂▅▃▆▅▆▃▄▄▅▃▅▄▅▃▅▄▃▃▆▄▃▃	9.8	25.7	2.5	11.7	14.3	5.2	10.9	14.6	14.8	5.4	7.717	9.676	12.744	3.274	-3.206	3.559	-2.591	-3.957	15.37	11.477	15.328	4.439	13.196	-0.951	14.817	5.026	17.541	11.792	15.523	5.795	10.301	10.617	14.254	5.059	13.844	8.745	13.671	5.324	11.264	9.728	5.855	5.866	17.012	7.526	6.175	4.091
us-gaap:NonoperatingIncomeExpense		NA	-3.3	-4.0	-5.5	-5.0	-8.1	-5.4	-4.9	-3.3	-4.2	-4.669	-5.572	-5.9	-5.995	-8.116	-6.719	-11.573	-1.928	-1.091	-0.381	0.035	-0.57	-0.535	-0.619	-0.776	-0.822	-1.074	-0.75	-0.085	-0.65	-0.218	-0.833	-0.803	-0.671	-0.342	-0.697	-1.178	-0.597	0.207	-1.82	0.487	0.211	-1.0	-0.151	-0.682	NA
us-gaap:OperatingExpenses		NA	77.0	100.3	86.4	67.7	89.7	99.1	92.5	100.9	97.4	94.374	92.646	99.77	100.265	106.071	93.558	95.399	82.349	70.921	69.041	72.73	70.405	69.524	84.087	72.446	69.827	70.469	70.059	72.122	67.68	66.113	65.633	66.119	65.64	64.493	63.762	67.354	66.984	68.078	64.49	73.23	63.739	67.671	61.341	60.914	NA
us-gaap:OperatingIncomeLoss	▅█▃▅▆▄▅▅▅▃▄▄▅▃▃▃▃▁▆▄▆▃▅▂▆▃▆▅▆▃▅▄▅▃▅▄▅▃▄▄▃▃▃▃▃	20.4	36.3	8.0	18.4	22.9	14.4	19.6	21.5	19.9	10.8	13.138	15.439	19.029	10.372	9.456	11.046	9.155	-2.613	22.588	16.254	22.559	7.097	17.765	4.57	22.587	8.254	22.615	17.104	23.141	9.237	17.669	16.229	21.622	6.883	18.97	13.801	21.597	8.335	15.452	15.763	10.238	8.192	9.491	10.521	10.629	NA
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	▄	-0.1	NA	NA	NA	-0.4	3.7	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:DerivativeInstrumentRisk,us-gaap:StatementEquityComponents us-gaap:ForeignExchangeForward,us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest	▄	-1.3	NA	NA	NA	-1.8	6.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:DerivativeInstrumentRisk,us-gaap:StatementEquityComponents us-gaap:ForeignExchangeOption,us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest		NA	6.0	NA	NA	-0.3	0.3	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	█▁	4.9	-10.7	NA	NA	4.5	-11.3	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	2.695	-2.512	-1.412	0.985	1.424	-4.023	2.166	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherComprehensiveIncomeLossNetOfTax	▆▃██▆▃▇▃▆▅▅▅▁▆▇▇█▆▄▅▅▆▆▄▆▃▃▄▅▅▇▆▅▅▅▆▄▆	4.9	-10.7	10.1	11.8	4.1	-7.6	8.8	-11.2	2.4	-1.3	1.039	-2.842	-18.147	5.079	6.103	8.188	10.963	2.346	-5.98	0.427	0.425	3.334	1.629	-5.243	2.049	-7.971	-8.604	-6.94	0.843	1.079	5.584	2.788	-1.854	-1.156	-1.413	1.67	-3.774	2.421	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherNonoperatingIncomeExpense	▅▅▅▄▄▅▂▅█▄▅▄▃▄▁▃▄▄▄▄▃▄▄▄▄▄▄▄▄▄▄▄▄▄▄▅▄▄▄▄▄▄▄▄▄	0.2	0.1	0.3	-0.2	-0.2	0.2	-0.7	0.1	1.4	-0.2	0.161	-0.13	-0.51	-0.25	-1.26	-0.482	-0.197	-0.021	-0.306	-0.01	-0.314	-0.036	-0.246	-0.174	-0.185	-0.052	-0.167	-0.162	-0.089	-0.031	-0.245	-0.157	-0.087	0.006	-0.137	0.099	0.041	0.035	0.045	0.0	-0.065	0.031	-0.134	0.057	0.058	NA
us-gaap:ProfitLoss	▄█▃▅▅▃▅▅▅▃▄▄▅▃▁▃▁▁▆▅▆	9.8	25.7	2.5	11.7	14.3	5.2	11.1	14.6	14.8	5.4	7.763	9.709	12.766	3.3	-3.188	3.596	-2.656	-3.957	15.37	11.477	15.328	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ResearchAndDevelopmentExpense	▇▇▇▇▇▇█▇▇▇▇▇▇▇▇▇▇▇█▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▁▁▇▇▇▁▇▇▇	8.3	7.4	8.7	7.4	6.6	7.4	8.9	8.2	8.4	7.2	7.331	7.506	7.906	7.996	7.774	7.907	7.886	8.446	10.026	8.418	8.39	7.904	8.094	8.207	8.404	7.71	7.456	6.844	7.651	7.481	7.22	7.97	7.821	7.518	7.705	7.353	-6.935	-7.27	7.675	7.24	6.717	-6.28	6.899	7.114	6.408	NA
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax	▇▆▇▆▄▆█▇█▆▇▇█▇▇▆▇▃▄▃▄▂▄▄▄▃▄▃▄▃▃▃▃▂▃▂▃▂▃▃▃▂▃▂▂▁	279.1	263.3	273.0	261.9	214.0	252.1	294.8	280.7	299.7	262.5	285.212	273.255	292.197	272.847	279.295	261.921	270.791	191.059	211.746	200.134	216.828	179.864	205.853	204.802	215.404	185.74	216.277	202.643	219.084	183.979	195.14	188.541	200.238	168.092	187.507	178.268	199.493	173.712	193.158	186.99	201.259	172.591	182.789	168.637	166.137	150.106
us-gaap:Revenues	▇▆▇▆▄▆█▇█▆▇▇█▇▇▆▇▃▄▃▄▂▄▄▄▃▄▃▄▃▃▃▃▂▃▂▃▂▃▃▃▂▃▂▂▁	279.1	263.3	273.0	261.9	214.0	252.1	294.8	280.7	299.7	262.5	285.212	273.255	292.197	272.847	279.295	261.921	270.791	191.059	211.746	200.134	216.828	179.864	205.853	204.802	215.404	185.74	216.277	202.643	219.084	183.979	195.14	188.541	200.238	168.092	187.507	178.268	199.493	173.712	193.158	186.99	201.259	172.591	182.789	168.637	166.137	150.106
us-gaap:SellingGeneralAndAdministrativeExpense	▇▇█▇▆▇█▇███▇███▇█▇▆▆▆▆▆▇▆▆▆▆▇▆▆▆▆▆▆▆▁▁▆▆▇▁▆▆▆	86.2	69.6	91.6	79.0	61.1	82.3	90.2	84.3	92.5	90.2	87.043	85.14	91.864	92.269	98.297	85.651	87.513	73.903	60.895	60.623	64.253	62.439	61.43	64.681	64.042	62.117	63.013	63.215	64.471	60.199	58.893	57.663	58.298	58.122	56.788	57.193	-60.419	-59.714	60.403	57.25	66.513	-57.459	60.772	54.227	54.506	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:Assets	▇▇▇▇▇█▇▇▇▇▇▆▆▇▇▇▇▂▂▁▁▁▁▁▂▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁	1081.4	1080.8	1082.6	1063.5	1028.2	1150.2	1062.9	1045.1	1070.8	1040.7	992.544	970.566	986.084	1015.902	993.977	1002.798	997.211	467.147	470.037	453.074	432.881	412.7	432.295	435.28	469.742	454.153	486.932	471.25	466.028	448.469	456.306	438.981	422.954	412.249	420.76	423.074	415.943	410.573	424.262	418.065	429.29	NA	403.668	NA	NA	NA
us-gaap:Liabilities	▆▇▇▇▆█▇▇▇▇▇▇▇▇▇▇▇▁▁▁▁▁▁▁▁▁▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁	643.9	659.4	676.5	668.2	655.1	791.5	701.6	705.3	735.6	720.5	676.192	661.483	683.887	708.531	695.503	706.262	709.846	190.595	191.494	180.853	172.091	160.968	180.088	189.929	191.638	181.67	206.281	197.882	196.64	183.037	192.46	187.752	182.441	179.766	185.706	193.465	193.343	186.27	203.41	201.052	205.862	NA	187.535	NA	NA	NA
us-gaap:LiabilitiesAndStockholdersEquity	▇▇▇▇▇█▇▇▇▇▇▆▆▇▇▇▇▂▂▁▁▁▁▁▂▁▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁	1081.4	1080.8	1082.6	1063.5	1028.2	1150.2	1062.9	1045.1	1070.8	1040.7	992.544	970.566	986.084	1015.902	993.977	1002.798	997.211	467.147	470.037	453.074	432.881	412.7	432.295	435.28	469.742	454.153	486.932	471.25	466.028	448.469	456.306	438.981	422.954	412.249	420.76	423.074	415.943	410.573	424.262	418.065	429.29	NA	403.668	NA	NA	NA
us-gaap:StockholdersEquity	█▇▇▇▆▅▆▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▃▃▃▃▃▃▂▂▂▁▂▁▁▁▁▁▁	436.2	420.1	404.8	393.9	371.7	357.3	359.9	338.3	333.7	318.0	314.422	307.189	300.327	305.485	296.503	294.313	284.155	276.552	278.543	272.221	260.79	251.732	252.207	245.351	278.104	272.483	280.651	273.368	269.388	265.432	263.846	251.229	240.513	232.483	235.054	229.609	222.6	224.303	220.852	217.013	223.428	NA	216.133	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AssetsCurrent	▇▇▆▆▅█▆▆▆▅▆▅▅▅▅▅▅▂▂▂▁▁▂▂▃▂▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁	522.4	530.5	493.6	491.3	460.9	585.2	481.0	479.5	479.4	452.4	468.644	439.14	445.262	434.68	423.115	423.673	426.647	287.788	297.922	281.557	277.682	259.446	293.644	309.401	328.615	319.186	347.089	329.245	320.658	307.118	315.296	295.709	281.383	268.22	273.446	270.191	265.221	257.223	272.096	268.456	276.092	NA	248.269	NA	NA	NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	▅▇▆▅▄█▂▂▁▁▃▁▁▁▂▂▁▁▂	135.1	175.2	141.0	124.7	99.3	192.1	74.6	71.7	55.4	46.9	86.134	54.007	54.444	54.646	59.051	57.239	54.548	45.629	58.55	NA	NA	NA	51.939	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccountsReceivableNetCurrent	▆▃▄▄▁▅▇▅█▅▆	207.6	190.1	195.4	198.0	180.3	203.8	216.5	204.9	222.1	204.2	207.948	NA	NA	NA	203.28	193.725	199.861	137.383	145.299	135.458	154.609	134.243	136.344	137.23	151.146	134.029	147.228	141.771	158.338	143.957	135.492	NA	NA	NA	131.47	NA	NA	NA	123.92	NA	NA	NA	NA	NA	NA	NA
us-gaap:InventoryNet	▇▆▆▆▇█▇███▆▇▇▇▆▇▇▃▂▃▃▃▂▃▃▃▃▃▂▂▂▂▁▁▁▁▂▂▂▂▂	148.2	137.5	127.7	133.5	149.9	155.2	150.1	160.9	159.5	158.2	135.133	139.793	139.406	140.29	127.694	141.519	141.579	88.093	78.622	87.284	82.52	84.085	77.292	83.315	86.534	85.611	80.511	83.964	79.034	73.838	66.906	67.39	62.699	64.126	58.136	60.953	68.413	68.128	65.912	77.408	74.394	NA	61.746	NA	NA	NA
us-gaap:InventoryFinishedGoods us-gaap:PublicUtilitiesInventory tnc:FifoInventory	▁█▇	50.4	56.2	55.0	NA	NA	NA	60.1	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:InventoryFinishedGoods us-gaap:PublicUtilitiesInventory tnc:LifoInventory	█▁▁	44.8	42.4	42.4	NA	NA	NA	50.9	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:InventoryLIFOReserve	█▆▅▅▅▆▇▆▅▅▅▄▂▂▂▂▂▂▂▁▁▁▁▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁	34.4	32.2	31.4	31.8	31.6	32.0	33.4	32.0	31.4	31.5	31.199	30.668	28.609	28.788	28.429	28.19	28.19	28.19	28.19	27.645	27.645	27.645	27.645	28.166	28.166	28.166	28.166	27.463	27.463	27.463	27.463	27.608	27.608	27.608	27.608	27.926	27.926	27.926	27.926	NA	NA	NA	26.462	NA	NA	NA
us-gaap:PrepaidExpenseAndOtherAssetsCurrent	▆▁▂▆▄▆▇█▇█▆	31.5	23.2	25.0	31.8	27.5	30.8	33.0	34.2	32.5	33.6	31.2	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NoncurrentAssets		NA	NA	529.6	NA	NA	NA	517.7	NA	NA	NA	508.413	NA	NA	NA	559.728	NA	NA	NA	158.677	NA	NA	NA	126.6	NA	NA	NA	131.678	NA	NA	NA	138.587	NA	NA	NA	135.056	NA	NA	NA	133.428	NA	NA	NA	137.067	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:IT		NA	NA	321.5	NA	NA	NA	325.2	NA	NA	NA	355.46	NA	NA	NA	393.917	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical country:US		NA	NA	121.9	NA	NA	NA	114.5	NA	NA	NA	107.3	NA	NA	NA	108.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical srt:Americas		NA	NA	136.6	NA	NA	NA	127.3	NA	NA	NA	118.609	NA	NA	NA	132.659	NA	NA	NA	134.737	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical srt:AsiaPacific		NA	NA	37.5	NA	NA	NA	36.6	NA	NA	NA	4.145	NA	NA	NA	4.731	NA	NA	NA	4.334	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical tnc:AmericasExcludingUnitedStates		NA	NA	14.7	NA	NA	NA	12.8	NA	NA	NA	11.3	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical tnc:OtherEuropeMiddleEastAndAfrica		NA	NA	34.0	NA	NA	NA	28.6	NA	NA	NA	30.2	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:NoncurrentAssets us-gaap:StatementGeographical us-gaap:EMEA		NA	NA	355.5	NA	NA	NA	353.8	NA	NA	NA	385.659	NA	NA	NA	422.338	NA	NA	NA	19.606	NA	NA	NA	11.1	NA	NA	NA	24.051	NA	NA	NA	28.296	NA	NA	NA	31.164	NA	NA	NA	31.126	NA	NA	NA	NA	NA	NA	NA
us-gaap:PropertyPlantAndEquipmentGross		NA	425.6	437.5	437.7	428.4	416.0	412.5	411.6	414.0	405.7	386.641	381.443	381.607	387.13	382.768	389.391	373.254	304.318	298.5	308.922	295.849	288.655	276.811	267.619	269.368	259.085	262.214	311.704	310.703	305.972	300.906	305.381	299.284	294.884	294.91	297.496	293.631	292.347	286.949	280.533	281.793	NA	287.751	NA	NA	NA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	█▇▇█▇▆▆▇▆▅▅▄▄▄▃▄▃▂▂▃▂▂▂▁▁▁▁▅▅▅▄▅▄▄▄▄▄▃▃▃▃	262.5	254.7	252.0	259.4	249.8	242.1	239.2	244.1	240.7	230.8	223.194	217.625	212.625	209.204	202.75	207.882	195.248	191.398	186.403	195.54	190.763	187.418	181.853	179.837	180.207	174.263	175.671	226.513	226.233	222.104	217.43	220.899	215.038	210.437	208.717	210.608	206.941	205.053	199.795	198.179	198.597	NA	200.123	NA	NA	NA
us-gaap:AmortizationOfIntangibleAssets	▆▆▆▆▆▆▆▆▆▆▅▆▆▆▆█▄▁▁▁▁▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂	5.0	5.3	5.5	5.3	5.0	5.0	5.6	5.1	5.8	5.7	4.751	5.72	5.819	5.838	5.624	7.65	3.536	0.244	0.086	0.099	0.112	0.112	0.113	0.332	0.516	0.52	0.557	0.589	0.612	0.611	0.646	0.633	0.637	0.644	0.705	0.663	0.656	0.776	0.797	0.829	0.872	0.832	0.81	0.793	NA	NA
us-gaap:PropertyPlantAndEquipmentNet	▇▇███▇▇▇▇▇▇▇▇▇██▇▃▃▃▃▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	172.1	170.9	185.5	178.3	178.6	173.9	173.3	167.5	173.3	174.9	163.447	163.818	168.982	177.926	180.018	181.509	178.006	112.92	112.097	113.382	105.086	101.237	94.958	87.782	89.161	84.822	86.543	85.191	84.47	83.868	83.476	84.482	84.246	84.447	86.193	86.888	86.69	87.294	87.154	82.354	83.196	NA	87.628	NA	NA	NA
us-gaap:Goodwill	████▇▇█▇▇▇▇▇▇█▇▇▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	202.0	199.2	207.8	201.4	193.9	191.2	195.1	185.4	193.3	189.7	182.671	184.619	185.715	196.165	186.044	179.048	183.25	21.456	21.065	24.669	17.524	17.151	16.803	16.822	17.67	17.557	18.355	18.725	19.295	19.161	18.929	19.246	19.263	19.798	19.717	19.779	19.83	20.442	20.303	20.385	21.917	NA	20.423	NA	NA	NA
us-gaap:IntangibleAssetsNetExcludingGoodwill	▅▆▆▆▆▆▆▇▇▇▇▇▇████▁▁▁▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂	111.1	114.6	126.2	126.6	126.7	129.6	137.7	139.5	150.1	156.0	146.546	152.974	157.674	172.297	172.347	175.752	166.198	8.769	6.46	2.887	2.979	3.105	3.195	3.32	14.292	14.221	15.588	16.68	18.136	18.506	19.028	19.411	19.245	19.929	21.393	21.912	22.198	23.532	23.758	24.793	26.433	NA	25.339	NA	NA	NA
us-gaap:FiniteLivedIntangibleAssetsNet	▁▃██	111.1	114.6	126.2	126.6	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OperatingLeaseRightOfUseAsset	████▇▇███▇▁	45.6	43.3	44.5	43.7	42.4	42.8	46.6	46.2	45.4	40.7	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherAssetsNoncurrent	▄	28.2	NA	25.0	NA	NA	NA	29.2	NA	NA	NA	15.747	14.953	14.73	20.002	21.319	22.959	22.953	19.933	19.054	17.362	15.508	18.852	11.644	10.728	12.379	10.926	11.192	15.337	16.962	17.056	17.154	7.303	8.389	9.503	9.022	8.736	5.397	5.717	5.937	7.427	8.244	NA	7.827	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AccountsPayableCurrent	█▇▇▅▄▆▆▆▆▆▆▅▇▇▆▅▅▂▁▁▂▁▂▂▃▂▃▂▃▂▂▂▂▂▁▁▂▁▁▂▂	118.5	104.8	106.3	86.0	77.4	95.8	94.1	93.9	98.7	94.9	98.398	90.778	103.602	102.702	96.082	88.618	88.572	49.521	47.408	44.997	49.838	46.568	50.35	54.394	59.735	56.758	61.627	57.896	60.122	54.409	53.079	49.295	52.763	51.58	47.002	43.537	49.039	44.238	46.869	51.499	55.667	NA	40.498	NA	NA	NA
us-gaap:ContractWithCustomerLiabilityCurrent		NA	NA	5.9	NA	NA	NA	6.8	NA	NA	NA	NA	NA	NA	4.732	4.468	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:ProductOrService,us-gaap:BalanceSheetLocation us-gaap:Maintenance,us-gaap:OtherCurrentLiabilities	█▇▁	6.6	6.5	5.9	NA	NA	NA	6.8	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DebtCurrent	▂▇▃▄█▁▆▄▂▆▅▆▆▆▆▂▂▁▂▂▂▂▂▂▂▂▂▂▂▁▂▂▂	3.2	36.4	10.9	16.0	42.5	1.1	31.3	20.2	8.3	30.1	27.005	30.999	30.969	30.902	30.883	5.281	5.307	0.033	3.459	3.461	3.46	3.461	3.459	3.435	3.435	3.486	3.566	3.717	3.64	2.236	3.803	3.935	4.013	NA	2.042	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LiabilitiesCurrent	██▇▆▇▆█▇▇▇▇▆▆▆▆▅▄▁▂▂▂▁▂▂▂▂▂▂▂▂▂▂▂▁▂▁▁▁▂▂▂	284.3	277.2	254.3	244.3	251.5	225.1	274.9	269.9	259.7	267.2	248.874	238.748	245.422	241.371	236.507	202.91	194.61	120.233	132.829	122.889	128.177	115.77	133.216	139.467	136.809	123.882	145.63	139.511	135.287	124.143	131.526	126.187	121.391	116.041	121.694	117.391	116.572	108.444	123.992	127.937	126.618	NA	116.144	NA	NA	NA
us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument tnc:The2017CreditAgreement		NA	35.6	10.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument tnc:The2021CreditAgreement	▄	2.5	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebtCurrent us-gaap:LongtermDebtType us-gaap:SecuredDebt		NA	0.7	0.8	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation us-gaap:OtherCurrentLiabilities		NA	NA	16.3	NA	NA	NA	16.7	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherAccruedLiabilitiesCurrent		NA	NA	11.3	NA	NA	NA	11.6	NA	NA	NA	13.117	NA	NA	NA	10.779	NA	NA	NA	4.385	NA	NA	NA	4.23	NA	NA	NA	6.581	NA	NA	NA	8.492	NA	NA	NA	8.115	NA	NA	NA	8.974	NA	NA	NA	11.401	NA	NA	NA
us-gaap:OtherLiabilitiesCurrent	█▆▆▇▆▆▆███▅▅▄▅▄▄▃▂▂▂▁▁▂▂▂▁▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁	101.6	87.0	83.4	91.8	86.6	88.0	86.0	102.9	102.5	100.6	71.895	71.842	66.753	70.293	69.447	63.327	58.189	45.173	43.617	42.585	40.792	38.602	43.027	42.67	41.494	38.072	45.508	43.209	43.456	41.39	44.076	40.512	39.156	36.876	38.844	37.519	36.836	36.401	39.404	40.571	40.055	NA	40.702	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:LiabilitiesNoncurrent	▅▆▆▆▆█▆▆▇▆▆▆▆▇▇▇▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	359.6	382.2	422.2	423.9	403.6	566.4	426.7	435.4	475.9	453.3	427.318	422.735	438.465	467.16	458.996	503.352	515.236	70.362	58.665	57.964	43.914	45.198	46.872	50.462	54.829	57.788	60.651	58.371	61.353	58.894	60.934	61.565	61.05	63.725	64.012	76.074	76.771	77.826	79.418	73.115	79.244	NA	71.391	NA	NA	NA
us-gaap:LongTermDebt		NA	NA	311.6	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebt us-gaap:DebtInstrument,us-gaap:SubsequentEventType tnc:SeniorUnsecuredNotes,us-gaap:SubsequentEvent		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:DebtAndCapitalLeaseObligations	▅▆▆▆▆█▆▆▆▆▆▆▆▇▇▇▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	269.2	308.3	308.5	323.6	340.0	463.6	338.8	342.4	354.4	360.2	355.065	352.955	365.11	379.416	383.279	395.671	418.438	45.046	36.194	36.205	21.211	22.65	24.653	24.578	24.578	26.057	28.137	28.167	28.212	28.236	31.803	31.977	32.182	NA	32.323	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LongTermDebtAndCapitalLeaseObligations	▅▅▅▆▅█▆▆▆▆▆▆▆▆▆▇▇▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	266.0	271.9	297.6	307.6	297.5	462.5	307.5	322.2	346.1	330.1	328.06	316.937	328.699	342.42	345.956	383.252	405.716	45.013	32.735	32.744	17.751	19.189	21.194	21.143	21.143	22.571	24.571	24.45	24.572	26.0	28.0	28.042	28.169	30.2	30.281	30.917	31.049	31.836	32.289	32.733	37.254	NA	27.674	NA	NA	NA
us-gaap:DeferredIncomeTaxLiabilitiesNet	▁▁▆▅▅▆█	33.4	33.8	39.1	38.7	38.7	39.8	41.7	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation,us-gaap:RetirementPlanType us-gaap:ForeignPlan,us-gaap:PensionPlansDefinedBenefit		NA	NA	5.4	NA	NA	NA	1.0	NA	NA	NA	0.916	NA	NA	NA	0.945	NA	NA	NA	1.544	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType us-gaap:DefinedBenefitPostretirementHealthCoverage		NA	NA	6.6	NA	NA	NA	7.1	NA	NA	NA	7.834	NA	NA	NA	8.833	NA	NA	NA	9.712	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:MinorityInterest	▁▁▁▁▁▁▁▂▂▄▃▃▃▃▃▄█	1.3	1.3	1.3	1.4	1.4	1.4	1.4	1.5	1.5	2.2	1.93	1.894	1.87	1.886	1.971	2.223	3.21	NA	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:OtherLiabilitiesNoncurrent	▃▅▇▅▄▃▅▄▆▅▅▆▆█▆▆▄▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁	13.4	31.3	38.9	31.8	22.3	18.2	27.8	21.5	34.6	31.7	32.13	35.479	36.739	47.934	35.948	32.686	24.937	4.956	4.625	4.556	4.846	4.493	4.165	3.688	4.543	4.147	4.38	4.961	5.281	5.069	4.891	4.701	4.643	4.577	4.533	3.895	3.945	3.897	3.851	4.804	5.676	NA	5.294	NA	NA	NA
us-gaap:OperatingLeaseLiabilityNoncurrent	█▇█▇▇▇███▇▁	29.5	27.7	28.7	27.8	27.1	27.3	30.3	29.8	29.1	24.7	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo		NA	NA	13.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree		NA	NA	9.4	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour		NA	NA	5.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive		NA	NA	2.1	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive		NA	NA	0.9	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:StockholdersEquity	█▇▇▇▆▅▆▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▃▃▃▃▃▃▂▂▂▁▂▁▁▁▁▁▁	436.2	420.1	404.8	393.9	371.7	357.3	359.9	338.3	333.7	318.0	314.422	307.189	300.327	305.485	296.503	294.313	284.155	276.552	278.543	272.221	260.79	251.732	252.207	245.351	278.104	272.483	280.651	273.368	269.388	265.432	263.846	251.229	240.513	232.483	235.054	229.609	222.6	224.303	220.852	217.013	223.428	NA	216.133	NA	NA	NA
us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	█▇▇▆▅▄▄▃▃▃▂▂▂▂▂▁▁	437.5	421.4	406.1	395.3	373.1	358.7	361.3	339.8	335.2	320.2	316.352	309.083	302.197	307.371	298.474	296.536	287.365	NA	278.543	NA	NA	NA	252.207	NA	NA	NA	280.651	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:CommonStockValue	▇▇▅▅▅▅▅▄▄▄▄▄▄▃▃▂▂▂▂▁▁▁▂▂▅▅▅▅▅▆▆▅▅▅▆▆▆██▇█	7.0	7.0	6.9	6.9	6.9	6.9	6.9	6.8	6.8	6.8	6.797	6.796	6.778	6.717	6.705	6.69	6.684	6.658	6.633	6.611	6.592	6.624	6.654	6.689	6.848	6.901	6.906	6.903	6.894	6.919	6.934	6.864	6.899	6.911	6.924	6.967	6.977	7.061	7.063	7.052	7.096	NA	7.14	NA	NA	NA
us-gaap:AdditionalPaidInCapital	█▇▇▇▆▆▆▅▅▄▄▄▃▃▃▂▂▂▁▁▁▁▁▁▃▄▄▄▃▄▄▄▄▄▃▃▃▃▃▂▂	64.9	59.1	54.7	52.2	49.4	49.4	45.5	39.7	34.5	32.0	28.55	26.087	22.273	18.295	15.089	12.062	9.915	6.97	3.653	3.032	0.0	0.0	0.0	0.0	17.185	24.719	26.247	24.271	21.47	30.172	31.956	28.828	25.892	23.928	22.398	20.061	17.882	15.922	15.082	13.372	12.259	NA	10.876	NA	NA	NA
us-gaap:RetainedEarningsAccumulatedDeficit	██▇▇▇▆▆▆▅▅▅▅▅▄▄▄▄▅▅▅▄▄▄▄▄▄▄▃▃▂▂▂▂▂▂▁▁▁▁▁▁	390.2	384.8	363.3	365.0	357.4	347.1	346.0	339.1	328.5	317.7	316.269	312.539	306.667	297.717	297.032	303.987	304.17	310.501	318.18	306.521	298.568	289.903	293.682	288.42	298.586	287.427	286.091	272.183	264.073	252.233	249.927	246.093	241.065	233.134	236.065	231.501	228.332	228.137	227.944	219.507	219.365	NA	220.391	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax	▆▅▇▅▃▂▃▂▄▃▄▃▄█▇▅▄▁▁▂▂▂▁▁▂▂▃▅▆▆▆▅▄▅▅▅▅▆▅▆█	-25.9	-30.8	-20.1	-30.2	-42.0	-46.1	-38.5	-47.3	-36.1	-38.5	-37.194	-38.233	-35.391	-17.244	-22.323	-28.426	-36.614	-47.577	-49.923	-43.943	-44.37	-44.795	-48.129	-49.758	-44.515	-46.564	-38.593	-29.989	-23.049	-23.892	-24.971	-30.556	-33.343	-31.49	-30.333	-28.92	-30.591	-26.817	-29.237	-22.918	-15.292	NA	-22.274	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedDefinedBenefitPlansAdjustment		NA	NA	NA	-0.7	-0.7	-0.7	-0.7	-0.3	-0.3	-0.3	-0.332	-1.661	-1.671	-1.679	-1.61	-5.01	-5.251	-5.399	-5.391	-3.609	-3.623	NA	-3.647	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges		NA	NA	NA	1.2	1.8	2.2	-1.5	-1.7	-3.0	-3.9	-5.031	-7.116	-7.094	-8.151	-4.935	-4.045	-2.959	-0.134	-0.088	-0.144	-0.166	NA	0.103	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents us-gaap:AccumulatedTranslationAdjustment		NA	NA	NA	-30.7	-43.1	-47.6	-36.3	-45.3	-32.8	-34.3	-31.831	-29.456	-26.626	-7.414	-15.778	-19.371	-28.404	-42.044	-44.444	-40.19	-40.581	NA	-44.585	NA	NA	NA	NA	NA	NA	NA	-21.991	NA	NA	NA	-19.734	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:MinorityInterest	▁▁▁▁▁▁▁▂▂▄▃▃▃▃▃▄█	1.3	1.3	1.3	1.4	1.4	1.4	1.4	1.5	1.5	2.2	1.93	1.894	1.87	1.886	1.971	2.223	3.21	NA	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	█▁	3.9	3.1	NA	1.9	NA	2.8	NA	3.7	1.7	3.3	NA	1.9	1.4	2.7	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NetCashProvidedByUsedInOperatingActivities	▅▄▇█▇▃▅▆▅▁▇▄▅▃▅▆▃▁▅▅▅▂▄▅▃▂▅▅▄▂▅▅▃▃▃▆▄▂▅▅▅▂▄▃	19.4	18.4	36.30000000000001	49.0	39.8	8.7	25.7	35.3	22.5	-11.6	36.501	17.505	20.425	5.539	22.051	34.618	8.614	-11.109	24.596	20.841	18.908	-6.467	14.328	24.331	8.695	-2.122	22.537	26.317	14.421	-3.913	23.006	21.584	7.961	7.263	4.284	30.739	15.473	-2.93	20.89	23.309	19.957	-7.247	12.346	5.804	NA	NA
us-gaap:NetCashProvidedByUsedInInvestingActivities	███▇█▇▇██▇██████▁▇█▇▇█▇███████████████▇█████	-3.1	19.8	-4.4	-7.1	-6.0	-12.4	-18.1	-2.9	-5.0	-29.6	-5.588	-2.326	-3.816	-4.297	-3.935	-6.581	-355.899	-9.009	-6.546	-19.96	-7.588	-6.349	-10.11	-6.049	-3.366	-4.056	-6.035	-4.53	-3.832	-3.473	-2.66	-1.326	-4.132	-3.279	-3.765	-1.47	-1.926	-4.081	-9.403	-3.41	-5.225	-1.459	-3.909	-2.358	NA	NA
us-gaap:NetCashProvidedByUsedInFinancingActivities	▂▃▃▃▁▅▃▃▃▃▃▃▃▃▃▂█▃▃▃▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃	-56.8	-1.8	-18.3	-19.8	-127.7	123.0	-4.6	-14.5	-9.8	1.5	3.052	-13.927	-14.983	-6.92	-16.324	-26.073	355.088	6.782	-1.101	13.365	-9.861	-11.961	-9.588	-28.282	-14.908	-8.627	-3.33	-2.448	-12.103	-10.157	-4.451	-4.377	-4.913	-7.754	-8.418	-6.139	-14.332	-6.043	-3.377	-15.458	-13.004	7.592	-2.026	-4.863	NA	NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	▃▅▅▅▁█▄▅▄▃▅▄▄▄▄▄▄▄	-40.1	34.2	16.300000000000008	25.4	-92.8	117.5	2.9	16.3	8.5	-39.2	32.127	-0.437	-0.202	-4.405	1.812	2.691	8.919	-12.921	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:AmortizationOfFinancingCosts		NA	NA	0.3	0.4	0.3	0.4	0.3	0.4	0.2	0.4	0.47	0.576	0.806	0.501	0.883	0.43	0.466	0.0	0.0	-0.077	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:IncreaseDecreaseInAccountsPayable	█▆█▇▁▆▄▅▅▅▆▃▆▆▆▅▆▅▅▄▆▄▄▅▅▄▆▅▆▅▆▄▅▆▆▄▆▅▄▄▇▆▄▄	13.7	3.2	16.3	10.0	-22.1	4.3	-5.2	-2.8	2.5	-2.0	6.325	-11.583	4.093	5.734	5.102	-0.443	4.308	1.882	2.511	-6.026	3.694	-4.083	-5.735	-1.28	-0.035	-3.405	4.313	-1.661	5.892	1.648	3.294	-3.319	0.329	5.816	3.318	-6.326	5.154	-1.176	-6.665	-3.238	9.316	5.199	-4.065	-5.393	NA	NA
us-gaap:IncreaseDecreaseInAccountsReceivable	▇▅▄▇▁▂▆▂▇▄▆▄▆▅▇▄▇▃▇▂█▃▅▃▇▂▇▃▇▅▅▇▂▆▆▆▃▅▆▆▃▄▅▄	12.8	0.7	-2.6	14.9	-22.4	-15.9	7.7	-15.5	17.1	-0.8	7.276	-6.49	6.473	0.359	13.857	-5.492	18.435	-12.419	15.03	-18.066	21.656	-9.342	2.146	-8.41	17.877	-16.16	12.734	-12.572	14.526	4.123	1.067	18.065	-17.453	5.939	10.055	9.294	-12.645	5.107	7.123	9.921	-8.65	-3.943	3.445	-3.198	NA	NA
us-gaap:IncreaseDecreaseInInventories	▆▇▃▁▃▆▂▅▄▇▃▄▅▆▃▄▄▅▃▄▄▅▃▅▄▅▄▅▅▅▄▇▄▃▄▅▃▃█▃▃▃▇▃	13.999999999999996	18.3	-5.2	-18.2	-6.5	11.6	-10.3	8.3	2.8	20.3	-2.993	2.511	6.252	10.787	-6.968	0.012	1.223	8.631	-4.896	0.932	-1.701	5.642	-4.522	3.71	1.473	9.529	-0.565	8.512	5.916	7.292	0.169	19.334	-0.439	-7.097	3.246	4.181	-4.427	-2.851	25.126	-7.188	-6.848	-3.425	16.952	-2.786	NA	NA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet	█▄▄▆▅▅▆▆▄▅▃▆▅▅▁▆▆▆▄▇▄▅▅▅▅▅▄▅▅▅▆▅▄▅▆▃▇▃▇▅▅▄▅▅	9.5	-1.2	-3.7	2.7	-0.6	1.1	2.9	3.5	-1.9	1.2	-3.921	2.258	0.747	1.423	-11.139	4.02	3.307	4.307	-2.965	5.118	-1.696	1.761	-0.079	1.047	2.034	1.099	-2.349	0.92	-0.273	0.426	2.423	1.203	-1.966	-0.1	4.758	-4.98	5.145	-5.638	6.342	-0.496	-0.722	-2.35	0.583	2.093	NA	NA
us-gaap:NetCashProvidedByUsedInOperatingActivities	▅▄▇█▇▃▅▆▅▁▇▄▅▃▅▆▃▁▅▅▅▂▄▅▃▂▅▅▄▂▅▅▃▃▃▆▄▂▅▅▅▂▄▃	19.4	18.4	36.30000000000001	49.0	39.8	8.7	25.7	35.3	22.5	-11.6	36.501	17.505	20.425	5.539	22.051	34.618	8.614	-11.109	24.596	20.841	18.908	-6.467	14.328	24.331	8.695	-2.122	22.537	26.317	14.421	-3.913	23.006	21.584	7.961	7.263	4.284	30.739	15.473	-2.93	20.89	23.309	19.957	-7.247	12.346	5.804	NA	NA
us-gaap:NetIncomeLoss	▄█▃▅▅▃▅▅▅▃▄▄▅▃▁▃▁▁▆▅▆▃▅▂▅▃▆▅▆▃▄▄▅▃▅▄▅▃▅▄▃▃▆▄▃▃	9.8	25.7	2.5	11.7	14.3	5.2	10.9	14.6	14.8	5.4	7.717	9.676	12.744	3.274	-3.206	3.559	-2.591	-3.957	15.37	11.477	15.328	4.439	13.196	-0.951	14.817	5.026	17.541	11.792	15.523	5.795	10.301	10.617	14.254	5.059	13.844	8.745	13.671	5.324	11.264	9.728	5.855	5.866	17.012	7.526	6.175	4.091
us-gaap:ProfitLoss	▄█▃▅▅▃▅▅▅▃▄▄▅▃▁▃▁▁▆▅▆	9.8	25.7	2.5	11.7	14.3	5.2	11.1	14.6	14.8	5.4	7.763	9.709	12.766	3.3	-3.188	3.596	-2.656	-3.957	15.37	11.477	15.328	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:ShareBasedCompensation	█▇▅▆▃▇▇█▅▇▆▆▅▇▄▅▅▆▁▅▅▆▅▅▆▇▆▅▆▅▄▅▅▅▆▇▆▅▅▅▅▅▆▄	3.9	3.1	1.3	1.9	0.0	2.8	2.7	3.7	1.7	3.3	2.306	1.893	1.367	2.748	0.976	1.293	1.049	2.573	-1.872	1.321	1.789	2.637	1.642	1.691	2.182	2.707	2.053	1.505	2.216	1.54	1.01	1.667	1.732	1.707	1.917	3.264	2.221	1.69	1.838	1.079	1.191	1.299	2.168	0.792	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NetCashProvidedByUsedInInvestingActivities	███▇█▇▇██▇██████▁▇█▇▇█▇███████████████▇█████	-3.1	19.8	-4.4	-7.1	-6.0	-12.4	-18.1	-2.9	-5.0	-29.6	-5.588	-2.326	-3.816	-4.297	-3.935	-6.581	-355.899	-9.009	-6.546	-19.96	-7.588	-6.349	-10.11	-6.049	-3.366	-4.056	-6.035	-4.53	-3.832	-3.473	-2.66	-1.326	-4.132	-3.279	-3.765	-1.47	-1.926	-4.081	-9.403	-3.41	-5.225	-1.459	-3.909	-2.358	NA	NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment	▂▂▂▃▃▅▄▁▂█▃▂▂▂▂▃▂▂▂▃▃▃▄▃▂▂▃▃▂▂▂▂▂▂▂▂▂▂▃▂▁▁▂▁	3.2	4.8	4.4	7.1	6.0	12.4	10.1	2.9	4.9	20.5	6.012	5.042	4.246	3.48	4.198	7.094	4.472	4.673	4.027	7.73	7.949	6.82	10.183	7.003	3.465	4.129	6.107	6.065	3.9	3.511	3.395	4.188	3.175	4.017	4.513	3.628	3.263	4.219	6.239	3.64	2.389	1.634	3.878	2.456	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:NetCashProvidedByUsedInFinancingActivities	▂▃▃▃▁▅▃▃▃▃▃▃▃▃▃▂█▃▃▃▃▃▃▂▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃	-56.8	-1.8	-18.3	-19.8	-127.7	123.0	-4.6	-14.5	-9.8	1.5	3.052	-13.927	-14.983	-6.92	-16.324	-26.073	355.088	6.782	-1.101	13.365	-9.861	-11.961	-9.588	-28.282	-14.908	-8.627	-3.33	-2.448	-12.103	-10.157	-4.451	-4.377	-4.913	-7.754	-8.418	-6.139	-14.332	-6.043	-3.377	-15.458	-13.004	7.592	-2.026	-4.863	NA	NA
us-gaap:ProceedsFromIssuanceOfLongTermDebt		NA	NA	0.0	0.0	1.4	125.0	0.0	0.0	12.0	13.0	11.0	0.0	0.0	0.0	0.0	0.0	420.0	20.0	0.0	15.0	0.0	0.0	0.0	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
us-gaap:PaymentsOfDividends	█▇▇▆▇▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▅▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▃▃▃▁	4.4	4.2	4.2	4.0	4.1	4.0	4.0	4.0	4.0	4.0	3.987	3.803	3.795	3.758	3.749	3.741	3.741	3.722	3.71	3.525	3.519	3.539	3.545	3.605	3.658	3.69	3.633	3.682	3.682	3.49	3.315	3.307	3.297	3.314	3.309	3.15	3.155	3.203	3.192	3.189	3.227	3.244	3.231	2.666	NA	NA

		2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument,us-gaap:SubsequentEventType tnc:SeniorUnsecuredNotes,us-gaap:SubsequentEvent		NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

Common Stock Value

us-gaap:CommonStockValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	7.0	7.0	6.9	6.9	6.9	6.9	6.9	6.8	6.8	6.8	6.797	6.796	6.778	6.717	6.705	6.69	6.684	6.658	6.633	6.611	6.592	6.624	6.654	6.689	6.848	6.901	6.906	6.903	6.894	6.919	6.934	6.864	6.899	6.911	6.924	6.967	6.977	7.061	7.063	7.052	7.096	7.14
Percentage of CommonStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.6	0.6	0.7	0.6	0.6	0.7	0.6	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	1.4	1.4	1.5	1.5	1.6	1.5	1.5	1.5	1.5	1.4	1.5	1.5	1.5	1.5	1.6	1.6	1.7	1.6	1.6	1.7	1.7	1.7	1.7	1.7	1.8

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	19
Percentage of CommonStockSharesIssued	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	18	19	18	18	19
Percentage of CommonStockSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31	2008-12-31
Value	18	18	18	18	18	18	18	18	18	18	17	17	17	17	18	18	18	19	18	18
Percentage of CommonStockSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	98.9	100.0	0.0	0.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

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	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31	2011-09-30	2011-06-30	2011-03-31	2010-09-30	2010-06-30
Value	18	18	18	18	18	18	18	18	18	18	17	17	17	17	17	17	18	18	18	18	18	18	18	18	19	19	19	19	19	19	19	19
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

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	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31	2011-09-30	2011-06-30	2011-03-31	2010-09-30	2010-06-30
Value	18	18	18	18	18	18	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18	18
Percentage of WeightedAverageNumberOfSharesOutstandingBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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	2017-09-30	2017-06-30	2017-03-31	2016-09-30	2016-06-30	2016-03-31	2015-09-30	2015-06-30	2015-03-31	2014-09-30	2014-06-30	2014-03-31	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31	2011-09-30	2011-06-30	2011-03-31
Value	578860.0	818910.0	206680.0	485850.0	688540.0	646490.0	139110.0	186830.0	291620.0	340240.0	735380.0	663310.0	313710.0	408980.0	381950.0	746210.0	237400.0	145290.0	81874.0	154900.0	142170.0	147740.0	278860.0	212970.0	251700.0	253780.0	177410.0	180550.0	179130.0	83368.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	0.64	0.78	0.28	0.6	0.81	0.82	0.3	0.43	0.54	0.71	0.18	-0.18	0.2	-0.15	-0.22	0.88	0.66	0.88	0.25	0.74	-0.05	0.81	0.27	0.96	0.65	0.85	0.32	0.56	0.58	0.78	0.28	0.75	0.47	0.74	0.28	0.6	0.52	0.31	0.31	0.91	0.4	0.33	0.22
Percentage of EarningsPerShareBasic	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	0.63	0.77	0.28	0.59	0.79	0.81	0.29	0.42	0.52	0.69	0.18	-0.18	0.2	-0.15	-0.22	0.85	0.64	0.85	0.25	0.73	-0.05	0.79	0.27	0.93	0.63	0.83	0.31	0.55	0.56	0.76	0.27	0.73	0.46	0.71	0.28	0.59	0.5	0.3	0.3	0.89	0.39	0.32	0.21
Percentage of EarningsPerShareDiluted	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31
Value	3.9	3.1	1.3	1.9	0.0	2.8	2.7	3.7	1.7	3.3	2.306	1.893	1.367	2.748	0.976	1.293	1.049	2.573	-1.872	1.321	1.789	2.637	1.642	1.691	2.182	2.707	2.053	1.505	2.216	1.54	1.01	1.667	1.732	1.707	1.917	3.264	2.218	1.69	1.838	1.079	1.191	1.299
Percentage of AllocatedShareBasedCompensationExpense	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.4	1.2	0.0	0.7	0.0	1.1	0.9	1.3	0.6	1.3	0.8	0.7	0.5	1.0	0.3	0.5	0.4	1.3	-0.9	0.7	0.8	1.5	0.8	0.8	1.0	1.5	0.9	0.7	1.0	0.8	0.5	0.9	0.9	1.0	1.0	1.8	1.1	1.0	1.0	0.6	0.6	0.8

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	14	15	12	23	18	-2.4	19	3.4	17	4.1	8.757	6.834	-5.403	8.353	2.897	11	8.372	-1.611	9.39	11	15	7.773	14	-6.194	16	-2.945	8.937	4.852	16	6.874	15	13	12	3.903
Percentage of ComprehensiveIncomeNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.3	5.7	0.0	9.0	8.6	-1.0	6.7	1.2	5.7	1.6	3.1	2.5	-1.8	3.1	1.0	4.5	3.1	-0.8	4.4	5.9	7.3	4.3	7.2	-3.0	7.8	-1.6	4.1	2.4	7.5	3.7	8.1	7.1	6.2	2.3

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2013-09-30	2013-06-30	2013-03-31	2012-09-30	2012-06-30	2012-03-31	2011-09-30	2011-06-30	2011-03-31
Value	14	15	12	23	18	-2.4	19	3.4	17	4.1	8.802	6.867	-5.381	8.379	2.915	11	8.307	-1.611	9.39	11	15	13	12	3.903	10	9.897	7.745	2.102	9.719	8.984
Percentage of ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	5.3	5.7	0.0	9.0	8.6	-1.0	6.8	1.2	5.7	1.6	3.1	2.5	-1.8	3.1	1.0	4.5	3.1	-0.8	4.4	5.9	7.3	7.1	6.2	2.3	5.8	5.0	4.5	1.1	4.8	5.2

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	164	150	164	157	123	148	176	166	178	154	177	165	173	162	163	157	166	111	118	114	121	102	118	116	120	107	123	115	123	107	111	106	112	95	104	100	110	98	109	106	117	100	105	96	94
Percentage of CostOfGoodsAndServicesSold	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	58.8	57.0	0.0	60.0	57.7	58.7	59.7	59.4	59.7	58.8	62.3	60.4	59.3	59.5	58.6	60.1	61.4	58.3	55.8	57.4	56.1	56.9	57.6	56.7	55.9	58.0	57.0	57.0	56.5	58.2	57.1	56.6	56.2	56.9	55.5	56.5	55.4	56.6	56.8	57.1	58.5	58.3	57.8	57.4	56.9

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

Period End	2021-06-30
Value	-11300000.0
Percentage of GainsLossesOnExtinguishmentOfDebt	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-4.0

Gross Profit

us-gaap:GrossProfit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	114	113	108	104	90	104	118	114	120	108	112	108	118	110	113	104	104	79	93	85	95	77	87	88	95	78	93	87	95	76	83	81	87	72	83	77	88	75	83	80	83	71	77	71	71	63
Percentage of GrossProfit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	41.2	43.0	0.0	40.0	42.3	41.3	40.2	40.6	40.3	41.2	39.3	39.6	40.7	40.5	40.8	39.9	38.6	41.7	44.2	42.6	43.9	43.1	42.4	43.3	44.1	42.0	43.0	43.0	43.5	41.8	42.9	43.4	43.8	43.1	44.5	43.5	44.6	43.4	43.2	42.9	41.5	41.7	42.2	42.6	43.1	42.5

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	7.2	33	4.0	12	17	6.3	14	16	16	6.6	8.469	9.867	13	4.377	1.34	4.327	-2.418	-4.541	21	15	22	6.527	17	3.951	21	7.432	21	16	23	8.587	17	15	20	6.212	18	13	20	7.738	15	13	10	8.403	8.491	10	9.947
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.6	12.5	0.0	4.9	8.4	2.5	4.8	5.9	5.5	2.5	3.0	3.6	4.5	1.6	0.5	1.7	-0.9	-2.4	10.2	7.9	10.4	3.6	8.4	1.9	10.1	4.0	10.0	8.1	10.5	4.7	8.9	8.2	10.4	3.7	9.9	7.4	10.2	4.5	8.1	7.5	5.3	4.9	4.6	6.1	6.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	-2.6	7.3	1.5	1.2	3.6	1.1	3.1	2.0	1.8	1.2	0.706	0.158	0.363	1.077	4.528	0.731	0.238	-0.584	6.127	4.396	7.266	2.088	4.034	4.902	6.994	2.406	4.0	4.562	7.533	2.792	7.15	4.779	6.565	1.153	4.784	4.359	6.748	2.414	4.395	4.215	4.87	2.537	-8.521	2.844	3.772
Percentage of IncomeTaxExpenseBenefit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.9	2.8	0.0	0.5	1.7	0.4	1.1	0.7	0.6	0.5	0.2	0.1	0.1	0.4	1.6	0.3	0.1	-0.3	2.9	2.2	3.4	1.2	2.0	2.4	3.2	1.3	1.8	2.3	3.4	1.5	3.7	2.5	3.3	0.7	2.6	2.4	3.4	1.4	2.3	2.3	2.4	1.5	-4.7	1.7	2.3

Income Taxes Paid

us-gaap:IncomeTaxesPaid

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	8.3	1.2	4.3	6.9	-0.1	0.9	9.1	7.0	2.2	3.4	3.818	1.589	4.066	1.659	5.415	3.276	1.562	3.289	2.843	8.155	1.465	1.709	5.369	9.35	4.729	3.973	3.068	6.629	0.902	0.743	5.365	5.259	1.894	0.94	1.244	4.925	4.214	1.18	5.048	4.24	1.005	2.865	4.036	6.197
Percentage of IncomeTaxesPaid	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.0	0.5	0.0	2.6	-0.0	0.4	3.1	2.5	0.7	1.3	1.3	0.6	1.4	0.6	1.9	1.3	0.6	1.7	1.3	4.1	0.7	1.0	2.6	4.6	2.2	2.1	1.4	3.3	0.4	0.4	2.7	2.8	0.9	0.6	0.7	2.8	2.1	0.7	2.6	2.3	0.5	1.7	2.2	3.7

Interest Expense

us-gaap:InterestExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	2.1	4.6	4.8	5.2	5.6	5.1	5.4	5.2	5.4	5.0	5.606	5.986	6.005	5.745	6.674	6.093	11	0.794	0.36	0.329	0.288	0.302	0.302	0.215	0.419	0.377	0.421	0.396	0.419	0.486	0.443	0.44	0.411	0.467	0.496	0.64	0.669	0.712	0.624	0.654	0.545	0.415	0.4	0.39	0.396
Percentage of InterestExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.8	1.7	0.0	2.0	2.6	2.0	1.8	1.9	1.8	1.9	2.0	2.2	2.1	2.1	2.4	2.3	4.4	0.4	0.2	0.2	0.1	0.2	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.3	0.2	0.2	0.2	0.3	0.3	0.4	0.3	0.4	0.3	0.3	0.3	0.2	0.2	0.2	0.2

Interest Paid Net

us-gaap:InterestPaidNet

Period End	2021-06-30	2021-03-31	2020-12-31	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	9.3	0.3	8.7	0.2	9.2	0.2	9.1	0.8	9.1	0.7	11
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.3	0.1	0.0	0.1	4.3	0.1	3.1	0.3	3.0	0.3	3.9

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	9.8	25	2.5	11	14	5.2	10	14	14	5.4	7.717	9.676	12	3.274	-3.206	3.559	-2.591	-3.957	15	11	15	4.439	13	-0.951	14	5.026	17	11	15	5.795	10	10	14	5.059	13	8.745	13	5.324	11	9.728	5.855	5.866	17	7.526	6.175	4.091
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	0.0	4.5	6.7	2.1	3.7	5.2	4.9	2.1	2.7	3.5	4.4	1.2	-1.1	1.4	-1.0	-2.1	7.3	5.7	7.1	2.5	6.4	-0.5	6.9	2.7	8.1	5.8	7.1	3.1	5.3	5.6	7.1	3.0	7.4	4.9	6.9	3.1	5.8	5.2	2.9	3.4	9.3	4.5	3.7	2.7

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	-3.3	-4.0	-5.5	-5.0	-8.1	-5.4	-4.9	-3.3	-4.2	-4.669	-5.572	-5.9	-5.995	-8.116	-6.719	-11.573	-1.928	-1.091	-0.381	0.035	-0.57	-0.535	-0.619	-0.776	-0.822	-1.074	-0.75	-0.085	-0.65	-0.218	-0.833	-0.803	-0.671	-0.342	-0.697	-1.178	-0.597	0.207	-1.82	0.487	0.211	-1.0	-0.151	-0.682
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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-1.3	0.0	-2.1	-2.3	-3.2	-1.8	-1.7	-1.1	-1.6	-1.6	-2.0	-2.0	-2.2	-2.9	-2.6	-4.3	-1.0	-0.5	-0.2	0.0	-0.3	-0.3	-0.3	-0.4	-0.4	-0.5	-0.4	-0.0	-0.4	-0.1	-0.4	-0.4	-0.4	-0.2	-0.4	-0.6	-0.3	0.1	-1.0	0.2	0.1	-0.5	-0.1	-0.4

Operating Expenses

us-gaap:OperatingExpenses

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	77	100	86	67	89	99	92	100	97	94	92	99	100	106	93	95	82	70	69	72	70	69	84	72	69	70	70	72	67	66	65	66	65	64	63	67	66	68	64	73	63	67	61	60
Percentage of OperatingExpenses	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	29.2	0.0	33.0	31.6	35.6	33.6	33.0	33.7	37.1	33.1	33.9	34.1	36.7	38.0	35.7	35.2	43.1	33.5	34.5	33.5	39.1	33.8	41.1	33.6	37.6	32.6	34.6	32.9	36.8	33.9	34.8	33.0	39.1	34.4	35.8	33.8	38.6	35.2	34.5	36.4	36.9	37.0	36.4	36.7

Operating Income Loss

us-gaap:OperatingIncomeLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	20	36	8.0	18	22	14	19	21	19	10	13	15	19	10	9.456	11	9.155	-2.613	22	16	22	7.097	17	4.57	22	8.254	22	17	23	9.237	17	16	21	6.883	18	13	21	8.335	15	15	10	8.192	9.491	10	10
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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.3	13.8	0.0	7.0	10.7	5.7	6.6	7.7	6.6	4.1	4.6	5.7	6.5	3.8	3.4	4.2	3.4	-1.4	10.7	8.1	10.4	3.9	8.6	2.2	10.5	4.4	10.5	8.4	10.6	5.0	9.1	8.6	10.8	4.1	10.1	7.7	10.8	4.8	8.0	8.4	5.1	4.7	5.2	6.2	6.4

Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

Period End	2021-06-30	2020-06-30	2020-03-31
Value	-100000.0	-400000.0	3700000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.0	-0.2	1.5

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:ForeignExchangeForward, us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-06-30	2020-06-30	2020-03-31
Value	-1300000.0	-1800000.0	6000000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	1300.0	450.0	162.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.5	-0.8	2.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeForward us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest	0.0	0.0	0.0

us-gaap:ForeignExchangeOption, us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-03-31	2020-06-30	2020-03-31
Value	6000000.0	-300000.0	300000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax	0.0	75.0	8.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.3	-0.1	0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeOption us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest	0.0	0.0	0.0

Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	4900000.0	-10700000.0	4500000.0	-11300000.0	2695000.0	-2512000.0	-1412000.0	985000.0	1424000.0	-4023000.0	2166000.0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.8	-4.1	2.1	-4.5	1.4	-1.3	-0.8	0.5	0.8	-2.0	1.2

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	4.9	-10.7	10	11	4.1	-7.6	8.8	-11.2	2.4	-1.3	1.039	-2.842	-18.147	5.079	6.103	8.188	10	2.346	-5.98	0.427	0.425	3.334	1.629	-5.243	2.049	-7.971	-8.604	-6.94	0.843	1.079	5.584	2.788	-1.854	-1.156	-1.413	1.67	-3.774	2.421
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.8	-4.1	0.0	4.5	1.9	-3.0	3.0	-4.0	0.8	-0.5	0.4	-1.0	-6.2	1.9	2.2	3.1	4.0	1.2	-2.8	0.2	0.2	1.9	0.8	-2.6	1.0	-4.3	-4.0	-3.4	0.4	0.6	2.9	1.5	-0.9	-0.7	-0.8	0.9	-1.9	1.4

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	4.9	-10.7
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.8	-4.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest	0.0	0.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	-0.6	-0.4	3.7	0.2	1.3	0.9	1.1	2.085	-0.022	1.057	-3.216	-0.89	-1.086	-2.825	-0.046	0.056	0.022
Percentage of OtherComprehensiveIncomeLossNetOfTax	-5.1	-9.8	-48.7	2.3	-11.6	37.5	-84.6	200.7	0.8	-5.8	-63.3	-14.6	-13.3	-25.8	-2.0	-0.9	5.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.2	-0.2	1.5	0.1	0.5	0.3	0.4	0.7	-0.0	0.4	-1.2	-0.3	-0.4	-1.0	-0.0	0.0	0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AccumulatedTranslationAdjustment

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	12	4.5	-11.3	9.0	-12.5	1.5	-2.4	-2.375	-2.83	-19.212	8.364	3.593	9.033	13	2.4	-4.254	0.391
Percentage of OtherComprehensiveIncomeLossNetOfTax	105.1	109.8	148.7	102.3	111.6	62.5	184.6	-228.6	99.6	105.9	164.7	58.9	110.3	124.4	102.3	71.1	91.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	4.7	2.1	-4.5	3.1	-4.5	0.5	-0.9	-0.8	-1.0	-6.6	3.1	1.3	3.4	5.0	1.3	-2.0	0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AccumulatedTranslationAdjustment	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	4.9	-10.7
Percentage of OtherComprehensiveIncomeLossNetOfTax	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	1.8	-4.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest	0.0	0.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	200000.0	100000.0	300000.0	-200000.0	-200000.0	200000.0	-700000.0	100000.0	1400000.0	-200000.0	161000.0	-130000.0	-510000.0	-250000.0	-1260000.0	-482000.0	-197000.0	-21000.0	-306000.0	-10000.0	-314000.0	-36000.0	-246000.0	-174000.0	-185000.0	-52000.0	-167000.0	-162000.0	-89000.0	-31000.0	-245000.0	-157000.0	-87000.0	6000.0	-137000.0	99000.0	41000.0	35000.0	45000.0	0	-65000.0	31000.0	-134000.0	57000.0	58000.0
Percentage of OtherNonoperatingIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.1	0.0	0.0	-0.1	-0.1	0.1	-0.2	0.0	0.5	-0.1	0.1	-0.0	-0.2	-0.1	-0.5	-0.2	-0.1	-0.0	-0.1	-0.0	-0.1	-0.0	-0.1	-0.1	-0.1	-0.0	-0.1	-0.1	-0.0	-0.0	-0.1	-0.1	-0.0	0.0	-0.1	0.1	0.0	0.0	0.0	0.0	-0.0	0.0	-0.1	0.0	0.0

Profit Loss

us-gaap:ProfitLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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
Value	9.8	25	2.5	11	14	5.2	11	14	14	5.4	7.763	9.709	12	3.3	-3.188	3.596	-2.656	-3.957	15	11	15
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	0.0	4.5	6.7	2.1	3.8	5.2	4.9	2.1	2.7	3.6	4.4	1.2	-1.1	1.4	-1.0	-2.1	7.3	5.7	7.1

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:Parent

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	9.8	25	11	14	5.2	14	14	5.4	9.7	12	3.3
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	99.9	99.5	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	4.5	6.7	2.1	5.2	4.9	2.1	3.5	4.3	1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

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	9.8	25	11	14	5.2	14	14	5.4	9.7	12	3.3
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	99.9	99.5	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	4.5	6.7	2.1	5.2	4.9	2.1	3.5	4.3	1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Research And Development Expense

us-gaap:ResearchAndDevelopmentExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	8.3	7.4	8.7	7.4	6.6	7.4	8.9	8.2	8.4	7.2	7.331	7.506	7.906	7.996	7.774	7.907	7.886	8.446	10	8.418	8.39	7.904	8.094	8.207	8.404	7.71	7.456	6.844	7.651	7.481	7.22	7.97	7.821	7.518	7.705	7.353	-6.935	-7.27	7.675	7.24	6.717	-6.28	6.899	7.114	6.408
Percentage of ResearchAndDevelopmentExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.0	2.8	0.0	2.8	3.1	2.9	3.0	2.9	2.8	2.7	2.6	2.7	2.7	2.9	2.8	3.0	2.9	4.4	4.7	4.2	3.9	4.4	3.9	4.0	3.9	4.2	3.4	3.4	3.5	4.1	3.7	4.2	3.9	4.5	4.1	4.1	-3.5	-4.2	4.0	3.9	3.3	-3.6	3.8	4.2	3.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	279	263	273	261	214	252	294	280	299	262	285	273	292	272	279	261	270	191	211	200	216	179	205	204	215	185	216	202	219	183	195	188	200	168	187	178	199	173	193	186	201	172	182	168	166	150
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ContractWithCustomerSalesChannel

us-gaap:SalesChannelDirectlyToConsumer

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	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	172	169	176	177	143	167	187	189	201	172	188	180	187	178	183	172	174
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	61.9	64.2	64.7	67.7	67.0	66.5	63.6	67.6	67.2	65.7	66.0	66.2	64.2	65.5	65.9	65.9	64.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	61.9	64.2	64.7	67.7	67.0	66.5	63.6	67.6	67.2	65.7	66.0	66.2	64.2	65.5	65.9	65.9	64.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SalesChannelDirectlyToConsumer	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SalesChannelThroughIntermediary

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	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	106	94	96	84	70	84	107	91	98	90	97	92	104	94	95	89	96
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	38.1	35.8	35.3	32.3	33.0	33.5	36.4	32.4	32.8	34.3	34.0	33.8	35.8	34.5	34.1	34.1	35.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	38.1	35.8	35.3	32.3	33.0	33.5	36.4	32.4	32.8	34.3	34.0	33.8	35.8	34.5	34.1	34.1	35.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SalesChannelThroughIntermediary	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DerivativeInstrumentRisk

us-gaap:ForeignExchangeForward

Period End	2021-06-30
Value	-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeForward	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ForeignExchangeOption, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-03-31
Value	0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ForeignExchangeOption us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

tnc:EquipmentSales

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	177	160	173	167	134	154	222	169	188	161	187	178	192	172	181	165	176	113
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	63.5	61.1	63.5	64.0	62.9	61.2	75.5	60.3	62.9	61.6	65.8	65.2	65.7	63.1	65.0	63.1	65.3	59.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	63.5	61.1	63.5	64.0	62.9	61.2	75.5	60.3	62.9	61.6	65.8	65.2	65.7	63.1	65.0	63.1	65.3	59.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:EquipmentSales	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:PartsAndConsumables

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	62	62	43	54
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	22.3	23.7	20.2	21.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	22.3	23.7	20.2	21.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:PartsAndConsumables	100.0	100.0	100.0	100.0

tnc:ServiceAndOther

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	39	38	31	37
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	14.2	14.7	14.5	14.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	14.2	14.7	14.5	14.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:ServiceAndOther	100.0	100.0	100.0	100.0

tnc:SpecialtyServiceCoatings

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	0.0	1.5	5.2	6.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.6	2.4	2.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	0.0	0.6	2.4	2.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:SpecialtyServiceCoatings	0.0	100.0	100.0	100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementGeographical

srt:Americas

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	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	167	157	164	167	136	162	186	186	189	160	174	175	178	162
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	59.9	59.9	60.2	64.0	63.7	64.5	63.1	66.3	63.2	61.3	61.1	64.2	61.2	59.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	59.9	59.9	60.2	64.0	63.7	64.5	63.1	66.3	63.2	61.3	61.1	64.2	61.2	59.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:Americas	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

srt:AsiaPacific

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	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	24	26	24	22	17	29	24	29	23	25	23	26	21
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.3	9.8	9.4	10.7	6.9	10.1	8.9	9.8	9.0	9.0	8.7	8.9	7.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.6	9.3	9.8	9.4	10.7	6.9	10.1	8.9	9.8	9.0	9.0	8.7	8.9	7.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:AsiaPacific	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EMEA

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	85	80	81	69	54	72	79	69	80	78	85	74	87	88	84	78	77	33	34	29	34	30	36	34	33	34	40	40	41	43	40	37	39	39
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	30.5	30.7	30.0	26.5	25.6	28.6	26.8	24.8	27.0	29.8	29.8	27.2	29.9	32.5	30.2	30.1	28.6	17.4	16.3	14.6	15.9	17.1	17.9	16.9	15.7	18.7	18.8	20.0	18.8	23.4	20.9	19.9	19.9	23.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	30.5	30.7	30.0	26.5	25.6	28.6	26.8	24.8	27.0	29.8	29.8	27.2	29.9	32.5	30.2	30.1	28.6	17.4	16.3	14.6	15.9	17.1	17.9	16.9	15.7	18.7	18.8	20.0	18.8	23.4	20.9	19.9	19.9	23.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:EMEA	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Revenues

us-gaap:Revenues

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	279	263	273	261	214	252	294	280	299	262	285	273	292	272	279	261	270	191	211	200	216	179	205	204	215	185	216	202	219	183	195	188	200	168	187	178	199	173	193	186	201	172	182	168	166	150
Percentage of Revenues	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Revenues us-gaap:ContractWithCustomerSalesChannel

us-gaap:SalesChannelDirectlyToConsumer

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	177	143	167	187	189	201	172	188	180	187	178
Percentage of Revenues	67.7	67.0	66.5	63.6	67.6	67.2	65.7	66.0	66.2	64.2	65.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	67.7	67.0	66.5	63.6	67.6	67.2	65.7	66.0	66.2	64.2	65.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SalesChannelDirectlyToConsumer	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SalesChannelThroughIntermediary

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	84	70	84	107	91	98	90	97	92	104	94
Percentage of Revenues	32.3	33.0	33.5	36.4	32.4	32.8	34.3	34.0	33.8	35.8	34.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	32.3	33.0	33.5	36.4	32.4	32.8	34.3	34.0	33.8	35.8	34.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:SalesChannelThroughIntermediary	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Revenues us-gaap:ProductOrService

tnc:EquipmentSales

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-03-31
Value	167	134	154	223	169	188	161	187	178	192	172	113
Percentage of Revenues	64.0	62.9	61.2	75.8	60.3	62.9	61.6	65.8	65.2	65.7	63.1	59.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	64.0	62.9	61.2	75.8	60.3	62.9	61.6	65.8	65.2	65.7	63.1	59.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:EquipmentSales	100.0	100.0	100.0	100.4	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:PartsandConsumables

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-03-31
Value	52	43	54	57	44	63	55	53	53	57	57	42
Percentage of Revenues	20.1	20.2	21.5	19.6	15.7	21.1	21.3	18.9	19.7	19.6	21.0	22.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	20.1	20.2	21.5	19.6	15.7	21.1	21.3	18.9	19.7	19.6	21.0	22.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:PartsandConsumables	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	100.1	100.0	0.0	0.0

tnc:ServicesandOther

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-03-31
Value	36	31	37	7.9	60	41	38	35	34	34	36	6.681
Percentage of Revenues	13.9	14.5	14.9	2.7	21.5	13.7	14.8	12.4	12.6	11.9	13.5	3.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	13.9	14.5	14.9	2.7	21.5	13.7	14.8	12.4	12.6	11.9	13.5	3.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:ServicesandOther	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	100.0	100.1	0.0	0.0

tnc:SpecialtySurfaceCoatings

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-03-31
Value	5.3	5.2	6.1	5.5	6.9	7.1	6.2	8.427	7.1	7.8	6.4	28
Percentage of Revenues	2.0	2.4	2.4	1.9	2.5	2.4	2.4	3.0	2.6	2.7	2.3	14.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	2.0	2.4	2.4	1.9	2.5	2.4	2.4	3.0	2.6	2.7	2.3	14.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax tnc:SpecialtySurfaceCoatings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	99.5	99.5	0.0	0.0

us-gaap:Revenues us-gaap:StatementGeographical

srt:Americas

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	167	136	162	186	186	189	160	174	175	178	162
Percentage of Revenues	64.0	63.7	64.5	63.1	66.3	63.2	61.3	61.1	64.2	61.2	59.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	64.0	63.7	64.5	63.1	66.3	63.2	61.3	61.1	64.2	61.2	59.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:Americas	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

srt:AsiaPacific

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	24	22	17	29	24	29	23	25	23	26	21
Percentage of Revenues	9.4	10.7	6.9	10.1	8.9	9.8	9.0	9.1	8.7	8.9	7.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	9.4	10.7	6.9	10.1	8.9	9.8	9.0	9.1	8.7	8.9	7.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:AsiaPacific	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EMEA

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	69	54	72	79	69	80	78	85	74	87	88	84	78	77	33	34	29	34	30	36	34	33	34	40	40	41	43	40	37	39	39
Percentage of Revenues	26.5	25.6	28.6	26.8	24.8	27.0	29.8	29.8	27.2	29.9	32.5	30.2	30.1	28.6	17.4	16.3	14.6	15.9	17.1	17.9	16.9	15.7	18.7	18.8	20.0	18.8	23.4	20.9	19.9	19.9	23.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	26.5	25.6	28.6	26.8	24.8	27.0	29.8	29.8	27.2	29.9	32.5	30.2	30.1	28.6	17.4	16.3	14.6	15.9	17.1	17.9	16.9	15.7	18.7	18.8	20.0	18.8	23.4	20.9	19.9	19.9	23.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:EMEA	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.1	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Selling General And Administrative Expense

us-gaap:SellingGeneralAndAdministrativeExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	86	69	91	79	61	82	90	84	92	90	87	85	91	92	98	85	87	73	60	60	64	62	61	64	64	62	63	63	64	60	58	57	58	58	56	57	-60.419	-59.714	60	57	66	-57.459	60	54	54
Percentage of SellingGeneralAndAdministrativeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	30.9	26.4	33.6	30.2	28.6	32.6	30.6	30.0	30.9	34.4	30.5	31.2	31.4	33.8	35.2	32.7	32.3	38.7	28.8	30.3	29.6	34.7	29.8	31.6	29.7	33.4	29.1	31.2	29.4	32.7	30.2	30.6	29.1	34.6	30.3	32.1	-30.3	-34.4	31.3	30.6	33.0	-33.3	33.2	32.2	32.8

Assets

us-gaap:Assets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	1081	1080	1082	1063	1028	1150	1062	1045	1070	1040	992	970	986	1015	993	1002	997	467	470	453	432	412	432	435	469	454	486	471	466	448	456	438	422	412	420	423	415	410	424	418	429	403
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Liabilities

us-gaap:Liabilities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	643	659	676	668	655	791	701	705	735	720	676	661	683	708	695	706	709	190	191	180	172	160	180	189	191	181	206	197	196	183	192	187	182	179	185	193	193	186	203	201	205	187
Percentage of Liabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	59.5	61.0	62.5	62.8	63.7	68.8	66.0	67.5	68.7	69.2	68.1	68.2	69.4	69.7	70.0	70.4	71.2	40.8	40.7	39.9	39.8	39.0	41.7	43.6	40.8	40.0	42.4	42.0	42.2	40.8	42.2	42.8	43.1	43.6	44.1	45.7	46.5	45.4	47.9	48.1	48.0	46.5

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	1081	1080	1082	1063	1028	1150	1062	1045	1070	1040	992	970	986	1015	993	1002	997	467	470	453	432	412	432	435	469	454	486	471	466	448	456	438	422	412	420	423	415	410	424	418	429	403
Percentage of LiabilitiesAndStockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31	2009-12-31	2008-12-31
Value	436	420	404	393	371	357	359	338	333	318	314	307	300	305	296	294	284	276	278	272	260	251	252	245	278	272	280	273	269	265	263	251	240	232	235	229	222	224	220	217	223	216	184	209
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	40.3	38.9	37.4	37.0	36.2	31.1	33.9	32.4	31.2	30.6	31.7	31.7	30.5	30.1	29.8	29.3	28.5	59.2	59.3	60.1	60.2	61.0	58.3	56.4	59.2	60.0	57.6	58.0	57.8	59.2	57.8	57.2	56.9	56.4	55.9	54.3	53.5	54.6	52.1	51.9	52.0	53.5	0.0	0.0

Assets Current

us-gaap:AssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	522	530	493	491	460	585	481	479	479	452	468	439	445	434	423	423	426	287	297	281	277	259	293	309	328	319	347	329	320	307	315	295	281	268	273	270	265	257	272	268	276	248
Percentage of AssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	48.3	49.1	45.6	46.2	44.8	50.9	45.3	45.9	44.8	43.5	47.2	45.2	45.2	42.8	42.6	42.2	42.8	61.6	63.4	62.1	64.1	62.9	67.9	71.1	70.0	70.3	71.3	69.9	68.8	68.5	69.1	67.4	66.5	65.1	65.0	63.9	63.8	62.6	64.1	64.2	64.3	61.5

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	135	175	141	124	99	192	74	71	55	46	86	54	54	54	59	57	54	45	58	51
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	12.5	16.2	13.0	11.7	9.7	16.7	7.0	6.9	5.2	4.5	8.7	5.6	5.5	5.4	5.9	5.7	5.5	9.8	12.5	12.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	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	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	2012-12-31	2011-12-31
Value	207	190	195	198	180	203	216	204	222	204	207	203	193	199	137	145	135	154	134	136	137	151	134	147	141	158	143	135	131	123
Percentage of AccountsReceivableNetCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	19.2	17.6	18.0	18.6	17.5	17.7	20.4	19.6	20.7	19.6	21.0	20.5	19.3	20.0	29.4	30.9	29.9	35.7	32.5	31.5	31.5	32.2	29.5	30.2	30.1	34.0	32.1	29.7	31.2	29.2

Inventory Net

us-gaap:InventoryNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	148	137	127	133	149	155	150	160	159	158	135	139	139	140	127	141	141	88	78	87	82	84	77	83	86	85	80	83	79	73	66	67	62	64	58	60	68	68	65	77	74	61
Percentage of InventoryNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	13.7	12.7	11.8	12.6	14.6	13.5	14.1	15.4	14.9	15.2	13.6	14.4	14.1	13.8	12.8	14.1	14.2	18.9	16.7	19.3	19.1	20.4	17.9	19.1	18.4	18.9	16.5	17.8	17.0	16.5	14.7	15.4	14.8	15.6	13.8	14.4	16.4	16.6	15.5	18.5	17.3	15.3

Inventory Finished Goods

us-gaap:InventoryFinishedGoods us-gaap:PublicUtilitiesInventory

us-gaap:InventoryFinishedGoods

tnc:FifoInventory

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	50	56	55	60
Percentage of InventoryFinishedGoods	100.0	100.0	100.0	100.0
Percentage of Assets	4.7	5.2	5.1	5.7
Percentage of Assets tnc:FifoInventory	0.0	0.0	0.0	0.0

tnc:LifoInventory

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	44	42	42	50
Percentage of InventoryFinishedGoods	88.9	75.4	77.1	84.7
Percentage of Assets	4.1	3.9	3.9	4.8
Percentage of Assets tnc:LifoInventory	0.0	0.0	0.0	0.0

Inventory L I F O Reserve

us-gaap:InventoryLIFOReserve

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	34	32	31	31	31	32	33	32	31	31	31	30	28	28	28	28	28	28	28	27	27	27	27	28	28	28	28	27	27	27	27	27	27	27	27	27	27	27	27	26
Percentage of InventoryLIFOReserve	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	3.2	3.0	2.9	3.0	3.1	2.8	3.1	3.1	2.9	3.0	3.1	3.2	2.9	2.8	2.9	2.8	2.8	6.0	6.0	6.1	6.4	6.7	6.4	6.5	6.0	6.2	5.8	5.8	5.9	6.1	6.0	6.3	6.5	6.7	6.6	6.6	6.7	6.8	6.6	6.6

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	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	31	23	25	31	27	30	33	34	32	33	31
Percentage of PrepaidExpenseAndOtherAssetsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	2.9	2.1	2.3	3.0	2.7	2.7	3.1	3.3	3.0	3.2	3.1

Noncurrent Assets

us-gaap:NoncurrentAssets

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	529	517	508	559	158	126	131	138	135	133	137
Percentage of NoncurrentAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	48.9	48.7	51.2	56.3	33.8	29.3	27.0	30.4	32.1	31.4	34.0

us-gaap:NoncurrentAssets us-gaap:StatementGeographical

country:IT

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	321	325	355	393
Percentage of NoncurrentAssets	60.7	62.8	69.9	70.4
Percentage of Assets	29.7	30.6	35.8	39.6
Percentage of Assets country:IT	0.0	0.0	0.0	0.0

country:US

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	121	114	107	108
Percentage of NoncurrentAssets	23.0	22.1	21.1	19.3
Percentage of Assets	11.3	10.8	10.8	10.9
Percentage of Assets country:US	0.0	0.0	0.0	0.0

srt:Americas

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	136	127	118	132	134
Percentage of NoncurrentAssets	25.8	24.6	23.3	23.7	84.9
Percentage of Assets	12.6	12.0	11.9	13.3	28.7
Percentage of Assets srt:Americas	0.0	0.0	0.0	0.0	0.0

srt:AsiaPacific

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	37	36	4.145	4.731	4.334
Percentage of NoncurrentAssets	7.1	7.1	0.8	0.8	2.7
Percentage of Assets	3.5	3.4	0.4	0.5	0.9
Percentage of Assets srt:AsiaPacific	0.0	0.0	0.0	0.0	0.0

tnc:AmericasExcludingUnitedStates

Period End	2020-12-31	2019-12-31	2018-12-31
Value	14	12	11
Percentage of NoncurrentAssets	2.8	2.5	2.2
Percentage of Assets	1.4	1.2	1.1
Percentage of Assets tnc:AmericasExcludingUnitedStates	0.0	0.0	0.0

tnc:OtherEuropeMiddleEastAndAfrica

Period End	2020-12-31	2019-12-31	2018-12-31
Value	34	28	30
Percentage of NoncurrentAssets	6.4	5.5	5.9
Percentage of Assets	3.1	2.7	3.0
Percentage of Assets tnc:OtherEuropeMiddleEastAndAfrica	0.0	0.0	0.0

us-gaap:EMEA

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31
Value	355	353	385	422	19	11	24	28	31	31
Percentage of NoncurrentAssets	67.1	68.3	75.9	75.5	12.4	8.8	18.3	20.4	23.1	23.3
Percentage of Assets	32.8	33.3	38.9	42.5	4.2	2.6	4.9	6.2	7.4	7.3
Percentage of Assets us-gaap:EMEA	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	425	437	437	428	416	412	411	414	405	386	381	381	387	382	389	373	304	298	308	295	288	276	267	269	259	262	311	310	305	300	305	299	294	294	297	293	292	286	280	281	287
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	100.0	100.0	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	39.4	40.4	41.2	41.7	36.2	38.8	39.4	38.7	39.0	39.0	39.3	38.7	38.1	38.5	38.8	37.4	65.1	63.5	68.2	68.3	69.9	64.0	61.5	57.3	57.0	53.9	66.1	66.7	68.2	65.9	69.6	70.8	71.5	70.1	70.3	70.6	71.2	67.6	67.1	65.6	71.3

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	262	254	252	259	249	242	239	244	240	230	223	217	212	209	202	207	195	191	186	195	190	187	181	179	180	174	175	226	226	222	217	220	215	210	208	210	206	205	199	198	198	200
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	100.0	100.0	100.0	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	24.3	23.6	23.3	24.4	24.3	21.0	22.5	23.4	22.5	22.2	22.5	22.4	21.6	20.6	20.4	20.7	19.6	41.0	39.7	43.2	44.1	45.4	42.1	41.3	38.4	38.4	36.1	48.1	48.5	49.5	47.7	50.3	50.8	51.0	49.6	49.8	49.8	49.9	47.1	47.4	46.3	49.6

Amortization Of Intangible Assets

us-gaap:AmortizationOfIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	5.0	5.3	5.5	5.3	5.0	5.0	5.6	5.1	5.8	5.7	4.751	5.72	5.819	5.838	5.624	7.65	3.536	0.244	0.086	0.099	0.112	0.112	0.113	0.332	0.516	0.52	0.557	0.589	0.612	0.611	0.646	0.633	0.637	0.644	0.705	0.663	0.656	0.776	0.797	0.829	0.872	0.832	0.81	0.793
Percentage of AmortizationOfIntangibleAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	172	170	185	178	178	173	173	167	173	174	163	163	168	177	180	181	178	112	112	113	105	101	94	87	89	84	86	85	84	83	83	84	84	84	86	86	86	87	87	82	83	87
Percentage of PropertyPlantAndEquipmentNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	15.9	15.8	17.1	16.8	17.4	15.1	16.3	16.0	16.2	16.8	16.5	16.9	17.1	17.5	18.1	18.1	17.9	24.2	23.8	25.0	24.3	24.5	22.0	20.2	19.0	18.7	17.8	18.1	18.1	18.7	18.3	19.2	19.9	20.5	20.5	20.5	20.8	21.3	20.5	19.7	19.4	21.7

Goodwill

us-gaap:Goodwill

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31	2009-12-31
Value	202	199	207	201	193	191	195	185	193	189	182	184	185	196	186	179	183	21	21	24	17	17	16	16	17	17	18	18	19	19	18	19	19	19	19	19	19	20	20	20	21	20	20
Percentage of Goodwill	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	18.7	18.4	19.2	18.9	18.9	16.6	18.4	17.7	18.1	18.2	18.4	19.0	18.8	19.3	18.7	17.9	18.4	4.6	4.5	5.4	4.0	4.2	3.9	3.9	3.8	3.9	3.8	4.0	4.1	4.3	4.1	4.4	4.6	4.8	4.7	4.7	4.8	5.0	4.8	4.9	5.1	5.1	0.0

us-gaap:Goodwill us-gaap:ReportingUnit

us-gaap:EMEA

Period End	2020-12-31
Value	168
Percentage of Goodwill	81.2
Percentage of Assets	15.6
Percentage of Assets us-gaap:EMEA	0.0

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	111	114	126	126	126	129	137	139	150	156	146	152	157	172	172	175	166	8.769	6.46	2.887	2.979	3.105	3.195	3.32	14	14	15	16	18	18	19	19	19	19	21	21	22	23	23	24	26	25
Percentage of IntangibleAssetsNetExcludingGoodwill	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	10.3	10.6	11.7	11.9	12.3	11.3	13.0	13.3	14.0	15.0	14.8	15.8	16.0	17.0	17.3	17.5	16.7	1.9	1.4	0.6	0.7	0.8	0.7	0.8	3.0	3.1	3.2	3.5	3.9	4.1	4.2	4.4	4.6	4.8	5.1	5.2	5.3	5.7	5.6	5.9	6.2	6.3

us-gaap:IntangibleAssetsNetExcludingGoodwill us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2012-12-31
Value	85	87	95	96	96	98	104	105	114	118	109	114	119	130	131	134	127	4.53	2.068	0.432	0.46	0.523	0.549	0.611	9.113	8.968	9.847	10	11	11	12	13
Percentage of IntangibleAssetsNetExcludingGoodwill	76.7	76.6	76.0	75.9	75.8	75.8	75.7	75.7	76.0	76.2	74.6	75.1	75.8	75.9	76.3	76.3	76.9	51.7	32.0	15.0	15.4	16.8	17.2	18.4	63.8	63.1	63.2	63.8	64.3	63.9	63.9	65.0
Percentage of Assets	7.9	8.1	8.9	9.0	9.3	8.5	9.8	10.1	10.7	11.4	11.0	11.8	12.1	12.9	13.2	13.4	12.8	1.0	0.4	0.1	0.1	0.1	0.1	0.1	1.9	2.0	2.0	2.3	2.5	2.6	2.7	3.3
Percentage of Assets us-gaap:CustomerLists	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:TechnologyBasedIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31
Value	7.3	7.6	8.2	8.4	8.7	9.0	9.8	10	10	11	11	11	10	11	11	11	2.265	2.328	2.392	2.455	2.519	2.582	2.646	2.709	3.267	3.344	3.509	3.637	3.799	3.908	4.014
Percentage of IntangibleAssetsNetExcludingGoodwill	6.6	6.6	6.5	6.6	6.9	6.9	7.1	7.3	7.1	7.2	8.1	7.7	7.0	7.0	6.6	6.7	1.4	26.5	37.0	85.0	84.6	83.2	82.8	81.6	22.9	23.5	22.5	21.8	20.9	21.1	21.1
Percentage of Assets	0.7	0.7	0.8	0.8	0.8	0.8	0.9	1.0	1.0	1.1	1.2	1.2	1.1	1.2	1.1	1.2	0.2	0.5	0.5	0.5	0.6	0.6	0.6	0.6	0.7	0.7	0.7	0.8	0.8	0.9	0.9
Percentage of Assets us-gaap:TechnologyBasedIntangibleAssets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:TradeNames

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2011-12-31
Value	18	19	22	22	22	22	23	23	25	25	25	26	27	29	29	29	33	1.911	2.0	0.0	0.0	1.912	1.909	2.232	2.407	2.669	2.77	2.86	2.9	2.885	2.93	3.092	3.374
Percentage of IntangibleAssetsNetExcludingGoodwill	16.7	16.8	17.5	17.5	17.4	17.3	17.1	17.0	16.9	16.6	17.2	17.2	17.3	17.1	17.1	17.0	19.9	21.8	31.0	0.0	0.0	13.4	13.4	14.3	14.4	14.7	15.0	15.0	14.9	15.0	14.7	14.5	14.2
Percentage of Assets	1.7	1.8	2.0	2.1	2.1	1.9	2.2	2.3	2.4	2.5	2.5	2.7	2.8	2.9	3.0	3.0	3.3	0.4	0.4	0.0	0.0	0.4	0.4	0.5	0.5	0.6	0.6	0.6	0.7	0.7	0.7	0.7	0.8
Percentage of Assets us-gaap:TradeNames	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Finite Lived Intangible Assets Net

us-gaap:FiniteLivedIntangibleAssetsNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	111	114	126	126
Percentage of FiniteLivedIntangibleAssetsNet	100.0	100.0	100.0	100.0
Percentage of Assets	10.3	10.6	11.7	11.9

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

Period End	2021-06-30	2021-03-31	2020-12-31	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	45	43	44	43	42	42	46	46	45	40	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	4.2	4.0	4.1	4.1	4.1	3.7	4.4	4.4	4.2	3.9	0.0

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

Period End	2021-06-30	2020-12-31	2019-12-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	28	25	29	15	14	14	20	21	22	22	19	19	17	15	18	11	10	12	10	11	15	16	17	17	7.303	8.389	9.503	9.022	8.736	5.397	5.717	5.937	7.427	8.244	7.827
Percentage of OtherAssetsNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	2.6	2.3	2.7	1.6	1.5	1.5	2.0	2.1	2.3	2.3	4.3	4.1	3.8	3.6	4.6	2.7	2.5	2.6	2.4	2.3	3.3	3.6	3.8	3.8	1.7	2.0	2.3	2.1	2.1	1.3	1.4	1.4	1.8	1.9	1.9

Accounts Payable Current

us-gaap:AccountsPayableCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	118	104	106	86	77	95	94	93	98	94	98	90	103	102	96	88	88	49	47	44	49	46	50	54	59	56	61	57	60	54	53	49	52	51	47	43	49	44	46	51	55	40
Percentage of AccountsPayableCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	11.0	9.7	9.8	8.1	7.5	8.3	8.9	9.0	9.2	9.1	9.9	9.4	10.5	10.1	9.7	8.8	8.9	10.6	10.1	9.9	11.5	11.3	11.6	12.5	12.7	12.5	12.7	12.3	12.9	12.1	11.6	11.2	12.5	12.5	11.2	10.3	11.8	10.8	11.0	12.3	13.0	10.0

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

Period End	2020-12-31	2019-12-31	2018-03-31	2017-12-31
Value	5900000.0	6800000.0	4732000.0	4468000.0
Percentage of ContractWithCustomerLiabilityCurrent	100.0	100.0	100.0	100.0
Percentage of Assets	0.5	0.6	0.5	0.4

us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:ProductOrService, us-gaap:BalanceSheetLocation

us-gaap:Maintenance, us-gaap:OtherCurrentLiabilities

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	6600000.0	6500000.0	5900000.0	6800000.0
Percentage of ContractWithCustomerLiabilityCurrent	0.0	0.0	100.0	100.0
Percentage of Assets	0.6	0.6	0.5	0.6
Percentage of Assets us-gaap:Maintenance us-gaap:OtherCurrentLiabilities	0.0	0.0	0.0	0.0

Debt Current

us-gaap:DebtCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2012-12-31
Value	3.2	36	10	16	42	1.1	31	20	8.3	30	27	30	30	30	30	5.281	5.307	0.033	3.459	3.461	3.46	3.461	3.459	3.435	3.435	3.486	3.566	3.717	3.64	2.236	3.803	3.935	4.013	2.042
Percentage of DebtCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	3.4	1.0	1.5	4.1	0.1	2.9	1.9	0.8	2.9	2.7	3.2	3.1	3.0	3.1	0.5	0.5	0.0	0.7	0.8	0.8	0.8	0.8	0.8	0.7	0.8	0.7	0.8	0.8	0.5	0.8	0.9	0.9	0.5

us-gaap:DebtCurrent us-gaap:LongtermDebtType

us-gaap:CreditFacilityDomain

Period End	2020-09-30	2020-06-30
Value	15	40
Percentage of DebtCurrent	93.8	94.1
Percentage of Assets	1.4	3.9
Percentage of Assets us-gaap:CreditFacilityDomain	0.0	0.0

us-gaap:LineOfCredit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	0.9	1.0	1.0	30	19	7.0	7.5	25	30	30	30	30	5.0	5.0
Percentage of DebtCurrent	5.6	2.4	90.9	95.8	94.1	84.3	24.9	96.0	96.8	96.9	97.1	97.1	94.7	94.2
Percentage of Assets	0.1	0.1	0.1	2.8	1.8	0.7	0.7	2.6	3.1	3.0	3.0	3.0	0.5	0.5
Percentage of Assets us-gaap:LineOfCredit	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Liabilities Current

us-gaap:LiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	284	277	254	244	251	225	274	269	259	267	248	238	245	241	236	202	194	120	132	122	128	115	133	139	136	123	145	139	135	124	131	126	121	116	121	117	116	108	123	127	126	116
Percentage of LiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	26.3	25.6	23.5	23.0	24.5	19.6	25.9	25.8	24.3	25.7	25.1	24.6	24.9	23.8	23.8	20.2	19.5	25.7	28.3	27.1	29.6	28.1	30.8	32.0	29.1	27.3	29.9	29.6	29.0	27.7	28.8	28.7	28.7	28.1	28.9	27.7	28.0	26.4	29.2	30.6	29.5	28.8

Long Term Debt Current

us-gaap:LongTermDebtCurrent us-gaap:DebtInstrument

us-gaap:LongTermDebtCurrent

tnc:The2017CreditAgreement

Period End	2021-03-31	2020-12-31
Value	35	10.0
Percentage of LongTermDebtCurrent	100.0	100.0
Percentage of Assets	3.3	0.9
Percentage of Assets tnc:The2017CreditAgreement	0.0	0.0

tnc:The2021CreditAgreement

Period End	2021-06-30
Value	2.5
Percentage of LongTermDebtCurrent	0.0
Percentage of Assets	0.2
Percentage of Assets tnc:The2021CreditAgreement	0.0

us-gaap:LongTermDebtCurrent us-gaap:LongtermDebtType

us-gaap:SecuredDebt

Period End	2021-03-31	2020-12-31
Value	0.7	0.8
Percentage of LongTermDebtCurrent	2.0	8.0
Percentage of Assets	0.1	0.1
Percentage of Assets us-gaap:SecuredDebt	0.0	0.0

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent us-gaap:BalanceSheetLocation

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherCurrentLiabilities

Period End	2020-12-31	2019-12-31
Value	16	16
Percentage of OperatingLeaseLiabilityCurrent	100.0	100.0
Percentage of Assets	1.5	1.6
Percentage of Assets us-gaap:OtherCurrentLiabilities	0.0	0.0

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	11	11	13	10	4.385	4.23	6.581	8.492	8.115	8.974	11
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
Percentage of Assets	1.0	1.1	1.3	1.1	0.9	1.0	1.4	1.9	1.9	2.1	2.8

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	101	87	83	91	86	88	86	102	102	100	71	71	66	70	69	63	58	45	43	42	40	38	43	42	41	38	45	43	43	41	44	40	39	36	38	37	36	36	39	40	40	40
Percentage of OtherLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	9.4	8.0	7.7	8.6	8.4	7.7	8.1	9.8	9.6	9.7	7.2	7.4	6.8	6.9	7.0	6.3	5.8	9.7	9.3	9.4	9.4	9.4	10.0	9.8	8.8	8.4	9.3	9.2	9.3	9.2	9.7	9.2	9.3	8.9	9.2	8.9	8.9	8.9	9.3	9.7	9.3	10.1

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	359	382	422	423	403	566	426	435	475	453	427	422	438	467	458	503	515	70	58	57	43	45	46	50	54	57	60	58	61	58	60	61	61	63	64	76	76	77	79	73	79	71
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	100.0	100.0	100.0	100.0	100.0	100.0	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	33.3	35.4	39.0	39.9	39.3	49.2	40.1	41.7	44.4	43.6	43.1	43.6	44.5	46.0	46.2	50.2	51.7	15.1	12.5	12.8	10.1	11.0	10.8	11.6	11.7	12.7	12.5	12.4	13.2	13.1	13.4	14.0	14.4	15.5	15.2	18.0	18.5	19.0	18.7	17.5	18.5	17.7

Long Term Debt

us-gaap:LongTermDebt

Period End	2020-12-31
Value	311
Percentage of LongTermDebt	100.0
Percentage of Assets	28.8

us-gaap:LongTermDebt us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnc:SeniorUnsecuredNotes, us-gaap:SubsequentEvent

Period End	2021-04-02
Value	300
Percentage of LongTermDebt	0.0
Percentage of Assets	0.0
Percentage of Assets tnc:SeniorUnsecuredNotes us-gaap:SubsequentEvent	0.0

Debt And Capital Lease Obligations

us-gaap:DebtAndCapitalLeaseObligations

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2012-12-31
Value	269	308	308	323	340	463	338	342	354	360	355	352	365	379	383	395	418	45	36	36	21	22	24	24	24	26	28	28	28	28	31	31	32	32
Percentage of DebtAndCapitalLeaseObligations	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	24.9	28.5	28.5	30.4	33.1	40.3	31.9	32.8	33.1	34.6	35.8	36.4	37.0	37.3	38.6	39.5	42.0	9.6	7.7	8.0	4.9	5.5	5.7	5.6	5.2	5.7	5.8	6.0	6.1	6.3	7.0	7.3	7.6	7.7

us-gaap:DebtAndCapitalLeaseObligations us-gaap:DebtInstrument

us-gaap:Bonds

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2016-12-31
Value	300	300	300	300	300	300	300	300	300	300	300	300	300	300	0.0
Percentage of DebtAndCapitalLeaseObligations	92.7	88.2	64.7	88.5	87.6	84.7	83.3	84.5	85.0	82.2	79.1	78.3	75.8	71.7	0.0
Percentage of Assets	28.2	29.2	26.1	28.2	28.7	28.0	28.8	30.2	30.9	30.4	29.5	30.2	29.9	30.1	0.0
Percentage of Assets us-gaap:Bonds	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:DebtAndCapitalLeaseObligations us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

tnc:JPMorgan2017CreditAgreement, us-gaap:LineOfCredit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	25	40	165	40	44	56	62	53	50	62	76	80
Percentage of DebtAndCapitalLeaseObligations	7.7	11.8	35.6	11.8	12.9	15.8	17.2	14.9	14.2	17.0	20.0	20.9
Percentage of Assets	2.4	3.9	14.3	3.8	4.2	5.2	6.0	5.3	5.2	6.3	7.5	8.0
Percentage of Assets tnc:JPMorgan2017CreditAgreement us-gaap:LineOfCredit	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:DebtAndCapitalLeaseObligations us-gaap:LongtermDebtType

us-gaap:Borrowings

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	1.7	2.0	2.1	2.4	2.1	2.2	2.3	2.4
Percentage of DebtAndCapitalLeaseObligations	0.5	0.6	0.5	0.7	0.6	0.6	0.6	0.7
Percentage of Assets	0.2	0.2	0.2	0.2	0.2	0.2	0.2	0.2
Percentage of Assets us-gaap:Borrowings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:CapitalLeaseObligations

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2012-12-31
Value	0.1	0.1	0.1	0.2	0.3	0.4	0.4	2.863	2.955	3.11	3.416	3.279	0.671	0.688	0.046	0.051	0.062	0.068	0.079	0.082	0.0	0.0	0.05	0.13	0.156	0.198	0.22	0.283	0.452	0.655	1.512
Percentage of DebtAndCapitalLeaseObligations	0.0	0.0	0.0	0.1	0.1	0.1	0.1	0.8	0.8	0.9	0.9	0.9	0.2	0.2	0.1	0.1	0.2	0.3	0.3	0.3	0.0	0.0	0.2	0.5	0.6	0.7	0.8	0.9	1.4	2.0	4.7
Percentage of Assets	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.3	0.3	0.3	0.3	0.3	0.1	0.1	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.1	0.1	0.2	0.4
Percentage of Assets us-gaap:CapitalLeaseObligations	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	266	271	297	307	297	462	307	322	346	330	328	316	328	342	345	383	405	45	32	32	17	19	21	21	21	22	24	24	24	26	28	28	28	30	30	30	31	31	32	32	37	27
Percentage of LongTermDebtAndCapitalLeaseObligations	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	24.6	25.2	27.5	28.9	28.9	40.2	28.9	30.8	32.3	31.7	33.1	32.7	33.3	33.7	34.8	38.2	40.7	9.6	7.0	7.2	4.1	4.6	4.9	4.9	4.5	5.0	5.0	5.2	5.3	5.8	6.1	6.4	6.7	7.3	7.2	7.3	7.5	7.8	7.6	7.8	8.7	6.9

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	33	33	39	38	38	39	41
Percentage of DeferredIncomeTaxLiabilitiesNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	3.1	3.1	3.6	3.6	3.8	3.5	3.9

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	5.4	1.0	0.916	0.945	1.544
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	0.5	0.1	0.1	0.1	0.3
Percentage of Assets us-gaap:ForeignPlan us-gaap:PensionPlansDefinedBenefit	0.0	0.0	0.0	0.0	0.0

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	6.6	7.1	7.834	8.833	9.712
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	122.2	710.0	855.2	934.7	629.0
Percentage of Assets	0.6	0.7	0.8	0.9	2.1
Percentage of Assets us-gaap:DefinedBenefitPostretirementHealthCoverage	0.0	0.0	0.0	0.0	0.0

Minority Interest

us-gaap:MinorityInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2016-12-31
Value	1300000.0	1300000.0	1300000.0	1400000.0	1400000.0	1400000.0	1400000.0	1500000.0	1500000.0	2200000.0	1930000.0	1894000.0	1870000.0	1886000.0	1971000.0	2223000.0	3210000.0	0
Percentage of MinorityInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	13	31	38	31	22	18	27	21	34	31	32	35	36	47	35	32	24	4.956	4.625	4.556	4.846	4.493	4.165	3.688	4.543	4.147	4.38	4.961	5.281	5.069	4.891	4.701	4.643	4.577	4.533	3.895	3.945	3.897	3.851	4.804	5.676	5.294
Percentage of OtherLiabilitiesNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	1.2	2.9	3.6	3.0	2.2	1.6	2.6	2.1	3.2	3.0	3.2	3.7	3.7	4.7	3.6	3.3	2.5	1.1	1.0	1.0	1.1	1.1	1.0	0.8	1.0	0.9	0.9	1.1	1.1	1.1	1.1	1.1	1.1	1.1	1.1	0.9	0.9	0.9	0.9	1.1	1.3	1.3

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	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	29	27	28	27	27	27	30	29	29	24	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	2.7	2.6	2.7	2.6	2.6	2.4	2.9	2.9	2.7	2.4	0.0

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

Period End	2020-12-31
Value	13
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	100.0
Percentage of Assets	1.2

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

Period End	2020-12-31
Value	9400000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree	100.0
Percentage of Assets	0.9

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

Period End	2020-12-31
Value	5000000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour	100.0
Percentage of Assets	0.5

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

Period End	2020-12-31
Value	2100000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive	100.0
Percentage of Assets	0.2

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

Period End	2020-12-31
Value	900000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	100.0
Percentage of Assets	0.1

Operating Lease Liability

us-gaap:OperatingLeaseLiability

Period End	2020-12-31
Value	45
Percentage of OperatingLeaseLiability	100.0
Percentage of Assets	4.2

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

Period End	2020-12-31
Value	48
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue	100.0
Percentage of Assets	4.4

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

Period End	2020-12-31	2019-12-31	2019-09-30	2019-06-30
Value	3000000.0	3500000.0	3600000.0	3500000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	100.0	100.0	100.0	100.0
Percentage of Assets	0.3	0.3	0.3	0.3

Stockholders Equity

us-gaap:StockholdersEquity

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31	2009-12-31	2008-12-31
Value	436	420	404	393	371	357	359	338	333	318	314	307	300	305	296	294	284	276	278	272	260	251	252	245	278	272	280	273	269	265	263	251	240	232	235	229	222	224	220	217	223	216	184	209
Percentage of StockholdersEquity	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	40.3	38.9	37.4	37.0	36.2	31.1	33.9	32.4	31.2	30.6	31.7	31.7	30.5	30.1	29.8	29.3	28.5	59.2	59.3	60.1	60.2	61.0	58.3	56.4	59.2	60.0	57.6	58.0	57.8	59.2	57.8	57.2	56.9	56.4	55.9	54.3	53.5	54.6	52.1	51.9	52.0	53.5	0.0	0.0

Stockholders Equity Including Portion Attributable To Noncontrolling Interest

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2016-12-31	2015-12-31	2014-12-31
Value	437	421	406	395	373	358	361	339	335	320	316	309	302	307	298	296	287	278	252	280
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
Percentage of Assets	40.5	39.0	37.5	37.2	36.3	31.2	34.0	32.5	31.3	30.8	31.9	31.8	30.6	30.3	30.0	29.6	28.8	59.3	58.3	57.6

us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	-1.6	-1.7	-1.7	-0.7
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-0.4	-0.4	-0.4	-0.2
Percentage of Assets	-0.1	-0.2	-0.2	-0.1
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustmentAttributableToNoncontrollingInterest	0.0	0.0	0.0	0.0

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	-24.9	-29.8	-19.1	-36.3
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-5.7	-7.1	-4.7	-10.0
Percentage of Assets	-2.3	-2.8	-1.8	-3.4
Percentage of Assets us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest	0.0	0.0	0.0	0.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	0.6	0.7	0.7	-1.5
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	0.1	0.2	0.2	-0.4
Percentage of Assets	0.1	0.1	0.1	-0.1
Percentage of Assets us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest	0.0	0.0	0.0	0.0

us-gaap:AccumulatedOtherComprehensiveIncome

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	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	2015-12-31	2014-12-31
Value	-25.9	-30.8	-20.1	-30.2	-42.0	-46.1	-38.5	-47.3	-36.1	-38.5	-37.194	-38.2	-35.4	-17.2	-22.323	-49.923	-48.129	-38.593
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-5.9	-7.3	-4.9	-7.6	-11.3	-12.9	-10.7	-13.9	-10.8	-12.0	-11.8	-12.4	-11.7	-5.6	-7.5	-17.9	-19.1	-13.8
Percentage of Assets	-2.4	-2.8	-1.9	-2.8	-4.1	-4.0	-3.6	-4.5	-3.4	-3.7	-3.7	-3.9	-3.6	-1.7	-2.2	-10.6	-11.1	-7.9
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	0.0	0.0	0.0	0.0	0.0

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	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	2015-12-31	2014-12-31
Value	64	59	54	52	49	49	45	39	34	32	28	26	22	18	15	3.653	0.0	26
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	14.8	14.0	13.5	13.2	13.2	13.8	12.6	11.7	10.3	10.0	9.0	8.4	7.4	6.0	5.1	1.3	0.0	9.4
Percentage of Assets	6.0	5.5	5.1	4.9	4.8	4.3	4.3	3.8	3.2	3.1	2.9	2.7	2.3	1.8	1.5	0.8	0.0	5.4
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	-25.9	-30.8	-20.1	-38.5
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-5.9	-7.3	-4.9	-10.7
Percentage of Assets	-2.4	-2.8	-1.9	-3.6
Percentage of Assets us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest	0.0	0.0	0.0	0.0

us-gaap:CommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	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	2015-12-31	2014-12-31
Value	7.0	7.0	6.9	6.9	6.9	6.9	6.9	6.8	6.8	6.8	6.797	6.8	6.8	6.7	6.705	6.633	6.654	6.906
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1.6	1.7	1.7	1.7	1.8	1.9	1.9	2.0	2.0	2.1	2.1	2.2	2.3	2.2	2.2	2.4	2.6	2.5
Percentage of Assets	0.6	0.6	0.6	0.6	0.7	0.6	0.6	0.7	0.6	0.7	0.7	0.7	0.7	0.7	0.7	1.4	1.5	1.4
Percentage of Assets us-gaap:CommonStock	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:NoncontrollingInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	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	2015-12-31	2014-12-31
Value	1.3	1.3	1.3	1.4	1.4	1.4	1.4	1.5	1.5	2.2	1.93	1.9	1.9	1.9	1.971	0.0	0.0	0.0
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	0.3	0.3	0.3	0.4	0.4	0.4	0.4	0.4	0.4	0.7	0.6	0.6	0.6	0.6	0.7	0.0	0.0	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	0.2	0.2	0.2	0.2	0.2	0.0	0.0	0.0
Percentage of Assets us-gaap:NoncontrollingInterest	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	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	2015-12-31	2014-12-31
Value	436	420	404	393	371	357	359	338	333	318	314	307	300	305	296	278	252	280
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	99.7	99.7	99.7	99.6	99.6	99.6	99.6	99.6	99.6	99.3	99.4	99.4	99.4	99.4	99.3	100.0	100.0	100.0
Percentage of Assets	40.3	38.9	37.4	37.0	36.2	31.1	33.9	32.4	31.2	30.6	31.7	31.7	30.5	30.1	29.8	59.3	58.3	57.6
Percentage of Assets us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	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	2015-12-31	2014-12-31
Value	390	384	363	365	357	347	346	339	328	317	316	312	306	297	297	318	293	286
Percentage of StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	89.2	91.3	89.5	92.3	95.8	96.8	95.8	99.8	98.0	99.2	100.0	101.1	101.5	96.9	99.5	114.2	116.4	101.9
Percentage of Assets	36.1	35.6	33.6	34.3	34.8	30.2	32.6	32.4	30.7	30.5	31.9	32.2	31.1	29.3	29.9	67.7	67.9	58.8
Percentage of Assets us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Common Stock Value

us-gaap:CommonStockValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	7.0	7.0	6.9	6.9	6.9	6.9	6.9	6.8	6.8	6.8	6.797	6.796	6.778	6.717	6.705	6.69	6.684	6.658	6.633	6.611	6.592	6.624	6.654	6.689	6.848	6.901	6.906	6.903	6.894	6.919	6.934	6.864	6.899	6.911	6.924	6.967	6.977	7.061	7.063	7.052	7.096	7.14
Percentage of CommonStockValue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.6	0.6	0.7	0.6	0.6	0.7	0.6	0.7	0.7	0.7	0.7	0.7	0.7	0.7	0.7	1.4	1.4	1.5	1.5	1.6	1.5	1.5	1.5	1.5	1.4	1.5	1.5	1.5	1.5	1.6	1.6	1.7	1.6	1.6	1.7	1.7	1.7	1.7	1.7	1.8

Additional Paid In Capital

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	64	59	54	52	49	49	45	39	34	32	28	26	22	18	15	12	9.915	6.97	3.653	3.032	0.0	0.0	0.0	0.0	17	24	26	24	21	30	31	28	25	23	22	20	17	15	15	13	12	10
Percentage of AdditionalPaidInCapital	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	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
Percentage of Assets	6.0	5.5	5.1	4.9	4.8	4.3	4.3	3.8	3.2	3.1	2.9	2.7	2.3	1.8	1.5	1.2	1.0	1.5	0.8	0.7	0.0	0.0	0.0	0.0	3.7	5.4	5.4	5.2	4.6	6.7	7.0	6.6	6.1	5.8	5.3	4.7	4.3	3.9	3.6	3.2	2.9	2.7

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	390	384	363	365	357	347	346	339	328	317	316	312	306	297	297	303	304	310	318	306	298	289	293	288	298	287	286	272	264	252	249	246	241	233	236	231	228	228	227	219	219	220
Percentage of RetainedEarningsAccumulatedDeficit	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	36.1	35.6	33.6	34.3	34.8	30.2	32.6	32.4	30.7	30.5	31.9	32.2	31.1	29.3	29.9	30.3	30.5	66.5	67.7	67.7	69.0	70.2	67.9	66.3	63.6	63.3	58.8	57.8	56.7	56.2	54.8	56.1	57.0	56.6	56.1	54.7	54.9	55.6	53.7	52.5	51.1	54.6

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	-25.9	-30.8	-20.1	-30.2	-42.0	-46.1	-38.5	-47.3	-36.1	-38.5	-37.194	-38.233	-35.391	-17.244	-22.323	-28.426	-36.614	-47.577	-49.923	-43.943	-44.37	-44.795	-48.129	-49.758	-44.515	-46.564	-38.593	-29.989	-23.049	-23.892	-24.971	-30.556	-33.343	-31.49	-30.333	-28.92	-30.591	-26.817	-29.237	-22.918	-15.292	-22.274
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of Assets	-2.4	-2.8	-1.9	-2.8	-4.1	-4.0	-3.6	-4.5	-3.4	-3.7	-3.7	-3.9	-3.6	-1.7	-2.2	-2.8	-3.7	-10.2	-10.6	-9.7	-10.2	-10.9	-11.1	-11.4	-9.5	-10.3	-7.9	-6.4	-4.9	-5.3	-5.5	-7.0	-7.9	-7.6	-7.2	-6.8	-7.4	-6.5	-6.9	-5.5	-3.6	-5.5

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedDefinedBenefitPlansAdjustment

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2015-12-31
Value	-0.7	-0.7	-0.7	-0.7	-0.3	-0.3	-0.3	-0.332	-1.661	-1.671	-1.679	-1.61	-5.01	-5.251	-5.399	-5.391	-3.609	-3.623	-3.647
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	2.3	1.7	1.5	1.8	0.6	0.8	0.8	0.9	4.3	4.7	9.7	7.2	17.6	14.3	11.3	10.8	8.2	8.2	7.6
Percentage of Assets	-0.1	-0.1	-0.1	-0.1	-0.0	-0.0	-0.0	-0.0	-0.2	-0.2	-0.2	-0.2	-0.5	-0.5	-1.2	-1.1	-0.8	-0.8	-0.8
Percentage of Assets us-gaap:AccumulatedDefinedBenefitPlansAdjustment	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2015-12-31
Value	1.2	1.8	2.2	-1.5	-1.7	-3.0	-3.9	-5.031	-7.116	-7.094	-8.151	-4.935	-4.045	-2.959	-0.134	-0.088	-0.144	-0.166	0.103
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	-4.0	-4.3	-4.8	3.9	3.6	8.3	10.1	13.5	18.6	20.0	47.3	22.1	14.2	8.1	0.3	0.2	0.3	0.4	-0.2
Percentage of Assets	0.1	0.2	0.2	-0.1	-0.2	-0.3	-0.4	-0.5	-0.7	-0.7	-0.8	-0.5	-0.4	-0.3	-0.0	-0.0	-0.0	-0.0	0.0
Percentage of Assets us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AccumulatedTranslationAdjustment

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2015-12-31	2013-12-31	2012-12-31
Value	-30.7	-43.1	-47.6	-36.3	-45.3	-32.8	-34.3	-31.831	-29.456	-26.626	-7.414	-15.778	-19.371	-28.404	-42.044	-44.444	-40.19	-40.581	-44.585	-21.991	-19.734
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax	101.7	102.6	103.3	94.3	95.8	90.9	89.1	85.6	77.0	75.2	43.0	70.7	68.1	77.6	88.4	89.0	91.5	91.5	92.6	88.1	65.1
Percentage of Assets	-2.9	-4.2	-4.1	-3.4	-4.3	-3.1	-3.3	-3.2	-3.0	-2.7	-0.7	-1.6	-1.9	-2.8	-9.0	-9.5	-8.9	-9.4	-10.3	-4.8	-4.7
Percentage of Assets us-gaap:AccumulatedTranslationAdjustment	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Minority Interest

us-gaap:MinorityInterest

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2016-12-31
Value	1300000.0	1300000.0	1300000.0	1400000.0	1400000.0	1400000.0	1400000.0	1500000.0	1500000.0	2200000.0	1930000.0	1894000.0	1870000.0	1886000.0	1971000.0	2223000.0	3210000.0	0
Percentage of MinorityInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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	0.2	0.2	0.2	0.2	0.2	0.2	0.3	0.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue

Period End	2021-06-30	2021-03-31	2020-09-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	3.9	3.1	1.9	2.8	3.7	1.7	3.3	1.9	1.4	2.7
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	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

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

Period End	2021-06-30	2021-03-31	2020-09-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	3.9	3.1	1.9	2.8	3.7	1.7	3.3	1.9	1.4	2.7
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	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
Percentage of Assets us-gaap:AdditionalPaidInCapital	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:Parent

Period End	2021-06-30	2021-03-31	2020-09-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31	2018-09-30	2018-06-30	2018-03-31
Value	3.9	3.1	1.9	2.8	3.7	1.7	3.3	1.9	1.4	2.7
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	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
Percentage of Assets us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	19	18	36	49	39	8.7	25	35	22	-11.6	36	17	20	5.539	22	34	8.614	-11.109	24	20	18	-6.467	14	24	8.695	-2.122	22	26	14	-3.913	23	21	7.961	7.263	4.284	30	15	-2.93	20	23	19	-7.247	12	5.804
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.0	7.0	13.3	18.7	18.6	3.5	8.7	12.6	7.5	-4.4	12.8	6.4	7.0	2.0	7.9	13.2	3.2	-5.8	11.6	10.4	8.7	-3.6	7.0	11.9	4.0	-1.1	10.4	13.0	6.6	-2.1	11.8	11.4	4.0	4.3	2.3	17.2	7.8	-1.7	10.8	12.5	9.9	-4.2	6.8	3.4

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	-3.1	19	-4.4	-7.1	-6.0	-12.4	-18.1	-2.9	-5.0	-29.6	-5.588	-2.326	-3.816	-4.297	-3.935	-6.581	-355.899	-9.009	-6.546	-19.96	-7.588	-6.349	-10.11	-6.049	-3.366	-4.056	-6.035	-4.53	-3.832	-3.473	-2.66	-1.326	-4.132	-3.279	-3.765	-1.47	-1.926	-4.081	-9.403	-3.41	-5.225	-1.459	-3.909	-2.358
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-1.1	7.5	-1.6	-2.7	-2.8	-4.9	-6.1	-1.0	-1.7	-11.3	-2.0	-0.9	-1.3	-1.6	-1.4	-2.5	-131.4	-4.7	-3.1	-10.0	-3.5	-3.5	-4.9	-3.0	-1.6	-2.2	-2.8	-2.2	-1.7	-1.9	-1.4	-0.7	-2.1	-2.0	-2.0	-0.8	-1.0	-2.3	-4.9	-1.8	-2.6	-0.8	-2.1	-1.4

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	-56.8	-1.8	-18.3	-19.8	-127.7	123	-4.6	-14.5	-9.8	1.5	3.052	-13.927	-14.983	-6.92	-16.324	-26.073	355	6.782	-1.101	13	-9.861	-11.961	-9.588	-28.282	-14.908	-8.627	-3.33	-2.448	-12.103	-10.157	-4.451	-4.377	-4.913	-7.754	-8.418	-6.139	-14.332	-6.043	-3.377	-15.458	-13.004	7.592	-2.026	-4.863
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-20.4	-0.7	-6.7	-7.6	-59.7	48.8	-1.6	-5.2	-3.3	0.6	1.1	-5.1	-5.1	-2.5	-5.8	-10.0	131.1	3.5	-0.5	6.7	-4.5	-6.7	-4.7	-13.8	-6.9	-4.6	-1.5	-1.2	-5.5	-5.5	-2.3	-2.3	-2.5	-4.6	-4.5	-3.4	-7.2	-3.5	-1.7	-8.3	-6.5	4.4	-1.1	-2.9

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	-40.1	34	16	25	-92.8	117	2.9	16	8.5	-39.2	32	-0.437	-0.202	-4.405	1.812	2.691	8.919	-12.921
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	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-14.4	13.0	6.0	9.7	-43.4	46.6	1.0	5.8	2.8	-14.9	11.3	-0.2	-0.1	-1.6	0.6	1.0	3.3	-6.8

Amortization Of Financing Costs

us-gaap:AmortizationOfFinancingCosts

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
Value	300000.0	400000.0	300000.0	400000.0	300000.0	400000.0	200000.0	400000.0	470000.0	576000.0	806000.0	501000.0	883000.0	430000.0	466000.0	0	0	-77000.0
Percentage of AmortizationOfFinancingCosts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0

Increase Decrease In Accounts Payable

us-gaap:IncreaseDecreaseInAccountsPayable

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	13	3.2	16	10.0	-22.1	4.3	-5.2	-2.8	2.5	-2.0	6.325	-11.583	4.093	5.734	5.102	-0.443	4.308	1.882	2.511	-6.026	3.694	-4.083	-5.735	-1.28	-0.035	-3.405	4.313	-1.661	5.892	1.648	3.294	-3.319	0.329	5.816	3.318	-6.326	5.154	-1.176	-6.665	-3.238	9.316	5.199	-4.065	-5.393
Percentage of IncreaseDecreaseInAccountsPayable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	12	0.7	-2.6	14	-22.4	-15.9	7.7	-15.5	17	-0.8	7.276	-6.49	6.473	0.359	13	-5.492	18	-12.419	15	-18.066	21	-9.342	2.146	-8.41	17	-16.16	12	-12.572	14	4.123	1.067	18	-17.453	5.939	10	9.294	-12.645	5.107	7.123	9.921	-8.65	-3.943	3.445	-3.198
Percentage of IncreaseDecreaseInAccountsReceivable	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	13	18	-5.2	-18.2	-6.5	11	-10.3	8.3	2.8	20	-2.993	2.511	6.252	10	-6.968	0.012	1.223	8.631	-4.896	0.932	-1.701	5.642	-4.522	3.71	1.473	9.529	-0.565	8.512	5.916	7.292	0.169	19	-0.439	-7.097	3.246	4.181	-4.427	-2.851	25	-7.188	-6.848	-3.425	16	-2.786
Percentage of IncreaseDecreaseInInventories	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	9.5	-1.2	-3.7	2.7	-0.6	1.1	2.9	3.5	-1.9	1.2	-3.921	2.258	0.747	1.423	-11.139	4.02	3.307	4.307	-2.965	5.118	-1.696	1.761	-0.079	1.047	2.034	1.099	-2.349	0.92	-0.273	0.426	2.423	1.203	-1.966	-0.1	4.758	-4.98	5.145	-5.638	6.342	-0.496	-0.722	-2.35	0.583	2.093
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	19	18	36	49	39	8.7	25	35	22	-11.6	36	17	20	5.539	22	34	8.614	-11.109	24	20	18	-6.467	14	24	8.695	-2.122	22	26	14	-3.913	23	21	7.961	7.263	4.284	30	15	-2.93	20	23	19	-7.247	12	5.804
Percentage of NetCashProvidedByUsedInOperatingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	7.0	7.0	13.3	18.7	18.6	3.5	8.7	12.6	7.5	-4.4	12.8	6.4	7.0	2.0	7.9	13.2	3.2	-5.8	11.6	10.4	8.7	-3.6	7.0	11.9	4.0	-1.1	10.4	13.0	6.6	-2.1	11.8	11.4	4.0	4.3	2.3	17.2	7.8	-1.7	10.8	12.5	9.9	-4.2	6.8	3.4

Net Income Loss

us-gaap:NetIncomeLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Value	9.8	25	2.5	11	14	5.2	10	14	14	5.4	7.717	9.676	12	3.274	-3.206	3.559	-2.591	-3.957	15	11	15	4.439	13	-0.951	14	5.026	17	11	15	5.795	10	10	14	5.059	13	8.745	13	5.324	11	9.728	5.855	5.866	17	7.526	6.175	4.091
Percentage of NetIncomeLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	0.9	4.5	6.7	2.1	3.7	5.2	4.9	2.1	2.7	3.5	4.4	1.2	-1.1	1.4	-1.0	-2.1	7.3	5.7	7.1	2.5	6.4	-0.5	6.9	2.7	8.1	5.8	7.1	3.1	5.3	5.6	7.1	3.0	7.4	4.9	6.9	3.1	5.8	5.2	2.9	3.4	9.3	4.5	3.7	2.7

Profit Loss

us-gaap:ProfitLoss

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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
Value	9.8	25	2.5	11	14	5.2	11	14	14	5.4	7.763	9.709	12	3.3	-3.188	3.596	-2.656	-3.957	15	11	15
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
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	0.9	4.5	6.7	2.1	3.8	5.2	4.9	2.1	2.7	3.6	4.4	1.2	-1.1	1.4	-1.0	-2.1	7.3	5.7	7.1

us-gaap:ProfitLoss us-gaap:StatementEquityComponents

us-gaap:Parent

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	9.8	25	11	14	5.2	14	14	5.4	9.7	12	3.3
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	99.9	99.5	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	4.5	6.7	2.1	5.2	4.9	2.1	3.5	4.3	1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:Parent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RetainedEarnings

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	9.8	25	11	14	5.2	14	14	5.4	9.7	12	3.3
Percentage of ProfitLoss	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	99.9	99.5	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	3.5	9.8	4.5	6.7	2.1	5.2	4.9	2.1	3.5	4.3	1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

Share Based Compensation

us-gaap:ShareBasedCompensation

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	3.9	3.1	1.3	1.9	0.0	2.8	2.7	3.7	1.7	3.3	2.306	1.893	1.367	2.748	0.976	1.293	1.049	2.573	-1.872	1.321	1.789	2.637	1.642	1.691	2.182	2.707	2.053	1.505	2.216	1.54	1.01	1.667	1.732	1.707	1.917	3.264	2.221	1.69	1.838	1.079	1.191	1.299	2.168	0.792
Percentage of ShareBasedCompensation	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	-3.1	19	-4.4	-7.1	-6.0	-12.4	-18.1	-2.9	-5.0	-29.6	-5.588	-2.326	-3.816	-4.297	-3.935	-6.581	-355.899	-9.009	-6.546	-19.96	-7.588	-6.349	-10.11	-6.049	-3.366	-4.056	-6.035	-4.53	-3.832	-3.473	-2.66	-1.326	-4.132	-3.279	-3.765	-1.47	-1.926	-4.081	-9.403	-3.41	-5.225	-1.459	-3.909	-2.358
Percentage of NetCashProvidedByUsedInInvestingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-1.1	7.5	-1.6	-2.7	-2.8	-4.9	-6.1	-1.0	-1.7	-11.3	-2.0	-0.9	-1.3	-1.6	-1.4	-2.5	-131.4	-4.7	-3.1	-10.0	-3.5	-3.5	-4.9	-3.0	-1.6	-2.2	-2.8	-2.2	-1.7	-1.9	-1.4	-0.7	-2.1	-2.0	-2.0	-0.8	-1.0	-2.3	-4.9	-1.8	-2.6	-0.8	-2.1	-1.4

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	3.2	4.8	4.4	7.1	6.0	12	10	2.9	4.9	20	6.012	5.042	4.246	3.48	4.198	7.094	4.472	4.673	4.027	7.73	7.949	6.82	10	7.003	3.465	4.129	6.107	6.065	3.9	3.511	3.395	4.188	3.175	4.017	4.513	3.628	3.263	4.219	6.239	3.64	2.389	1.634	3.878	2.456
Percentage of PaymentsToAcquirePropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	-56.8	-1.8	-18.3	-19.8	-127.7	123	-4.6	-14.5	-9.8	1.5	3.052	-13.927	-14.983	-6.92	-16.324	-26.073	355	6.782	-1.101	13	-9.861	-11.961	-9.588	-28.282	-14.908	-8.627	-3.33	-2.448	-12.103	-10.157	-4.451	-4.377	-4.913	-7.754	-8.418	-6.139	-14.332	-6.043	-3.377	-15.458	-13.004	7.592	-2.026	-4.863
Percentage of NetCashProvidedByUsedInFinancingActivities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax	-20.4	-0.7	-6.7	-7.6	-59.7	48.8	-1.6	-5.2	-3.3	0.6	1.1	-5.1	-5.1	-2.5	-5.8	-10.0	131.1	3.5	-0.5	6.7	-4.5	-6.7	-4.7	-13.8	-6.9	-4.6	-1.5	-1.2	-5.5	-5.5	-2.3	-2.3	-2.5	-4.6	-4.5	-3.4	-7.2	-3.5	-1.7	-8.3	-6.5	4.4	-1.1	-2.9

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

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
Value	0.0	0.0	1.4	125	0.0	0.0	12	13	11	0.0	0.0	0.0	0.0	0.0	420	20	0.0	15	0.0	0.0	0.0
Percentage of ProceedsFromIssuanceOfLongTermDebt	0.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	0.0	100.0	0.0	0.0	0.0

Payments Of Dividends

us-gaap:PaymentsOfDividends

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	4.4	4.2	4.2	4.0	4.1	4.0	4.0	4.0	4.0	4.0	3.987	3.803	3.795	3.758	3.749	3.741	3.741	3.722	3.71	3.525	3.519	3.539	3.545	3.605	3.658	3.69	3.633	3.682	3.682	3.49	3.315	3.307	3.297	3.314	3.309	3.15	3.155	3.203	3.192	3.189	3.227	3.244	3.231	2.666
Percentage of PaymentsOfDividends	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:DebtInstrumentInterestRateStatedPercentage

tnc:SeniorUnsecuredNotes, us-gaap:SubsequentEvent

Period End	2021-04-02
Value	5.625
Percentage of DebtInstrumentInterestRateStatedPercentage	100.0
Percentage of LongTermDebtAndCapitalLeaseObligations	0.0
Percentage of LongTermDebtAndCapitalLeaseObligations tnc:SeniorUnsecuredNotes us-gaap:SubsequentEvent	0.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

Period End	2021-06-30	2020-06-30	2018-12-31	2018-09-30	2018-06-30
Value	-37.0	19.7	0.006	0.016	0.028
Percentage of EffectiveIncomeTaxRateContinuingOperations	100.0	100.0	100.0	100.0	100.0

Deferred Tax Liabilities

us-gaap:DeferredTaxLiabilities

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	24	65	55	69	11	10	12	14	14	16	16	17
Percentage of DeferredTaxLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	42	40	24	27	24	22	24	27	33	38	38	27
Percentage of DeferredTaxAssetsNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Unrecognized Tax Benefits

us-gaap:UnrecognizedTaxBenefits

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	4700000.0	5400000.0	6400000.0	7100000.0	7500000.0	5653000.0	2232000.0	2477000.0	2326000.0	3029000.0	3660000.0	3480000.0	3424000.0	5272000.0
Percentage of UnrecognizedTaxBenefits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	7.5	6.2	11	9.691	6.865	5.884	5.699	7.243	4.719	3.229	-9.17	-9.131
Percentage of DeferredTaxAssetsValuationAllowance	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:ContractWithCustomerLiabilityContractPayments us-gaap:ProductOrService

tnc:ContractWithCustomerLiabilityContractPayments

tnc:SalesIncentives

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	7.3	5.7	3.600000000000001	8.2
Percentage of ContractWithCustomerLiabilityContractPayments	100.0	100.0	100.0	100.0

tnc:ContractWithCustomerLiabilityDivestitureOfBusiness us-gaap:ProductOrService

tnc:ContractWithCustomerLiabilityDivestitureOfBusiness

tnc:SalesIncentives

Period End	2021-06-30	2021-03-31
Value	0	100000.0
Percentage of ContractWithCustomerLiabilityDivestitureOfBusiness	0.0	100.0

tnc:ContractWithCustomerLiabilityImpactOfForeignCurrency us-gaap:ProductOrService

tnc:ContractWithCustomerLiabilityImpactOfForeignCurrency

tnc:SalesIncentives

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	100000.0	-200000.0	100000.0	-200000.0
Percentage of ContractWithCustomerLiabilityImpactOfForeignCurrency	100.0	100.0	100.0	100.0

tnc:ContractWithCustomerLiabilityIncreaseDecreaseForSalesIncentiveAccruals us-gaap:ProductOrService

tnc:ContractWithCustomerLiabilityIncreaseDecreaseForSalesIncentiveAccruals

tnc:SalesIncentives

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	10	5.2	3.7	5.4
Percentage of ContractWithCustomerLiabilityIncreaseDecreaseForSalesIncentiveAccruals	100.0	100.0	100.0	100.0

tnc:ContractWithCustomerLiabilityIncreaseInObligationToSatisfyFutureObligations us-gaap:ProductOrService

tnc:ContractWithCustomerLiabilityIncreaseInObligationToSatisfyFutureObligations

us-gaap:Maintenance

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	13	4.1	4.5	2.7
Percentage of ContractWithCustomerLiabilityIncreaseInObligationToSatisfyFutureObligations	100.0	100.0	100.0	100.0

tnc:ContractwithCustomerLiabilityContractPayments

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-3.8	-3.6	-8.2	-3.3	-5.0	-32.0	12	-5.3	-4.9	-28.4	11
Percentage of ContractwithCustomerLiabilityContractPayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:ContractwithCustomerLiabilityImpactofForeignCurrency

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	0	100000.0	-200000.0	100000.0	-200000.0	100000.0	0	0	-100000.0	-300000.0	100000.0
Percentage of ContractwithCustomerLiabilityImpactofForeignCurrency	0.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0

tnc:ContractwithCustomerLiabilityIncreaseDecreaseforSalesIncentiveAccruals

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	5.9	3.7	5.4	3.7	6.4	8.1	6.5	8.4	7.2	8.9	6.0
Percentage of ContractwithCustomerLiabilityIncreaseDecreaseforSalesIncentiveAccruals	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:DebtInstrumentCollateralPercentageOfStockOfFirstTierForeignSubsidiaries us-gaap:DebtInstrument

tnc:DebtInstrumentCollateralPercentageOfStockOfFirstTierForeignSubsidiaries

tnc:The2021CreditAgreement

Period End	2021-04-05
Value	65.0
Percentage of DebtInstrumentCollateralPercentageOfStockOfFirstTierForeignSubsidiaries	100.0

tnc:DebtInstrumentCollateralPercentageOfStockOfFirstTierForeignSubsidiaries us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnc:The2021CreditAgreement, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	65.0
Percentage of DebtInstrumentCollateralPercentageOfStockOfFirstTierForeignSubsidiaries	100.0

tnc:DeferredRevenueForeignCurrencyImpact

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-600000.0	-100000.0	-100000.0	100000.0	-100000.0	0	0	-100000.0	0	-200000.0	100000.0
Percentage of DeferredRevenueForeignCurrencyImpact	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	0.0	100.0	100.0

tnc:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoInterestIncomeEffectivePortionNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

tnc:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoInterestIncomeEffectivePortionNet

us-gaap:ForwardContracts, us-gaap:CashFlowHedging

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	500000.0	600000.0	500000.0	600000.0	500000.0	600000.0	500000.0	525000.0	487000.0	467000.0	391000.0	375000.0	374000.0	449000.0
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoInterestIncomeEffectivePortionNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoNetForeignCurrencyTransactionGainsLossesEffectivePortionNet us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

tnc:DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoNetForeignCurrencyTransactionGainsLossesEffectivePortionNet

us-gaap:ForwardContracts, us-gaap:CashFlowHedging

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30
Value	-5700000.0	-2300000.0	2100000.0	-3600000.0	5400000.0	-1600000.0	2400000.0	1629000.0	739000.0	7912000.0	-3927000.0	-1702000.0	-3705000.0	-7148000.0
Percentage of DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoNetForeignCurrencyTransactionGainsLossesEffectivePortionNet	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:GoodwillNetForeignCurrencyFluctuations

Period End	2021-06-30	2021-03-31	2020-12-31
Value	-2.8000000000000003	6.9	-19.0
Percentage of GoodwillNetForeignCurrencyFluctuations	100.0	100.0	100.0

tnc:IntangibleAssetsExcludingGoodwillDisposedOf us-gaap:FiniteLivedIntangibleAssetsByMajorClass

tnc:IntangibleAssetsExcludingGoodwillDisposedOf

us-gaap:CustomerLists

Period End	2021-03-31
Value	900000.0
Percentage of IntangibleAssetsExcludingGoodwillDisposedOf	100.0

us-gaap:TradeNames

Period End	2021-03-31
Value	1400000.0
Percentage of IntangibleAssetsExcludingGoodwillDisposedOf	155.6

tnc:RepaymentofShorttermandLongTermDebt

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	16	125	0.3	3.9	12	17	8.0	8.1	12	14	3.9
Percentage of RepaymentofShorttermandLongTermDebt	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1

Period End	2020-12-31	2020-09-30	2019-12-31	2019-09-30	2018-12-31	2018-09-30
Value	-100000.0	0	-500000.0	-3800000.0	0	0
Percentage of BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	100.0	0.0	100.0	100.0	0.0	0.0

us-gaap:CapitalExpendituresIncurredButNotYetPaid

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30
Value	-600000.0	1300000.0	1500000.0	-3100000.0	4700000.0	700000.0	2800000.0	0	400000.0	700000.0	1676000.0	-758000.0	65000.0	1328000.0	902000.0	-175000.0	-142000.0	1582000.0	723000.0	-216000.0	-147000.0	1685000.0	1109000.0	-2931000.0	2751000.0	901000.0	196000.0	286000.0	-146000.0	861000.0	217000.0	-510000.0	727000.0	656000.0	-94000.0	594000.0
Percentage of CapitalExpendituresIncurredButNotYetPaid	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:CapitalLeaseObligationsIncurred

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2013-12-31	2013-09-30	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	0	0	100000.0	0	100000.0	200000.0	-100000.0	0	-100000.0	271000.0	-834000.0	679000.0	149000.0	389000.0	309000.0	272000.0	1332000.0	747000.0	542000.0	-201000.0	675000.0
Percentage of CapitalLeaseObligationsIncurred	0.0	0.0	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

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

Period End	2021-06-30	2021-03-31
Value	-1300000.0	2100000.0
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	100.0	100.0

us-gaap:CommonStockDividendsPerShareCashPaid

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	0.22	0.22	0.22	0.22	0.22	0.22	0.21	0.21	0.21
Percentage of CommonStockDividendsPerShareCashPaid	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:Maintenance

Period End	2021-03-31	2020-03-31
Value	3.4	2.5
Percentage of ContractWithCustomerLiabilityRevenueRecognized	100.0	100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, us-gaap:FederalFundsEffectiveSwapRate

Period End	2021-04-05
Value	0.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:DebtInstrument, us-gaap:VariableRate

tnc:The2021CreditAgreement, us-gaap:FederalFundsEffectiveSwapRate

Period End	2021-04-05
Value	0.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:Range, us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:VariableRate

srt:Maximum, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, tnc:LiborOnEurocurrencyLiabilities

Period End	2021-04-05
Value	1.7
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	340.0

srt:Maximum, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-04-05
Value	0.7
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	140.0

srt:Minimum, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, tnc:LiborOnEurocurrencyLiabilities

Period End	2021-04-05
Value	1.1
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	220.0

srt:Minimum, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-04-05
Value	0.1
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	20.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 us-gaap:Range, us-gaap:DebtInstrument, us-gaap:VariableRate

srt:Maximum, tnc:The2021CreditAgreement, tnc:LiborOnEurocurrencyLiabilities

Period End	2021-04-05
Value	1.7
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	340.0

srt:Maximum, tnc:The2021CreditAgreement, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-04-05
Value	0.7
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	140.0

srt:Minimum, tnc:The2021CreditAgreement, tnc:LiborOnEurocurrencyLiabilities

Period End	2021-04-05
Value	1.1
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	220.0

srt:Minimum, tnc:The2021CreditAgreement, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-04-05
Value	0.1
Percentage of DebtInstrumentBasisSpreadOnVariableRate1	20.0

us-gaap:DebtInstrumentPeriodicPaymentInterest us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DebtInstrumentPeriodicPaymentInterest

us-gaap:CurrencySwap, us-gaap:DesignatedAsHedgingInstrument

Period End	2021-06-30	2021-03-31	2020-12-31
Value	-1.8	7.8	-1.8
Percentage of DebtInstrumentPeriodicPaymentInterest	100.0	100.0	100.0

us-gaap:DebtInstrumentPeriodicPaymentPrincipal us-gaap:StatementScenario, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DebtInstrumentPeriodicPaymentPrincipal

srt:ScenarioForecast, us-gaap:CurrencySwap, us-gaap:DesignatedAsHedgingInstrument

Period End	2022-04-30
Value	150
Percentage of DebtInstrumentPeriodicPaymentPrincipal	100.0

us-gaap:DeferredIncomeTaxesAndTaxCredits

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31
Value	-4400000.0	-1500000.0	-2300000.0	1000000.0	-200000.0	-2500000.0	-6900000.0	1500000.0	-5500000.0	1300000.0	-954000.0	-2051000.0	-4706000.0	-3151000.0	-1247000.0	1184000.0	-3382000.0	-2650000.0	-496000.0	957000.0	-1124000.0	-509000.0	3032000.0	-2407000.0	-1959000.0	205000.0	-3007000.0	-828000.0	90000.0	3874000.0	5626000.0	-1902000.0	361000.0	1537000.0	3897000.0	540000.0	-273000.0	-998000.0	-2297000.0	-2304000.0	1178000.0	2071000.0
Percentage of DeferredIncomeTaxesAndTaxCredits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredRevenueAdditions

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	8.1	4.5	2.7	17	2.4	2.1	3.8	3.7	3.5	3.8	3.7
Percentage of DeferredRevenueAdditions	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanContributionsByEmployer us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	0.1	0.1	0.1	0.2	0.3	0.3	0.2	0.2	0.149	0.139	0.287	0.269
Percentage of DefinedBenefitPlanContributionsByEmployer	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PensionPlansDefinedBenefit

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	0.1	0.1	0.1	0.1	0.1	0.1	0.036	0.037	0.114
Percentage of DefinedBenefitPlanContributionsByEmployer	100.0	100.0	50.0	33.3	50.0	50.0	25.9	12.9	42.4

us-gaap:Depreciation

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	7.8999999999999995	8.3	8.5	8.4	7.6	8.1	8.2	8.1	7.9	8.0	8.201	7.75	8.632	7.708	7.684	7.472	6.55	4.493	4.741	4.495	4.399	4.256	4.586	3.809	4.033	4.122	4.508	4.368	4.391	4.427	4.508	4.32	4.366	4.492	4.833	4.302	4.473	4.464	5.288	4.136	4.273	4.391	4.358	4.489
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	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:InterestExpense

Period End	2021-06-30	2020-06-30
Value	500000.0	800000.0
Percentage of DerivativeGainLossOnDerivativeNet	100.0	100.0

us-gaap:CashFlowHedging, us-gaap:DesignatedAsHedgingInstrument, us-gaap:Sales

Period End	2021-06-30
Value	-200000.0
Percentage of DerivativeGainLossOnDerivativeNet	-40.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:DesignatedAsHedgingInstrument, us-gaap:ForeignCurrencyGainLoss

Period End	2021-06-30	2020-06-30
Value	-1900000.0	-3000000.0
Percentage of DerivativeGainLossOnDerivativeNet	-380.0	-375.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet

us-gaap:ForeignExchangeForward

Period End	2021-06-30	2020-06-30	2020-03-31	2015-09-30	2014-09-30
Value	-700000.0	-1600000.0	2200000.0	840000.0	1975000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	100.0	100.0	100.0	100.0	100.0

us-gaap:ForeignExchangeOption

Period End	2021-03-31	2015-09-30	2014-09-30
Value	2100000.0	0	0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	0.0	0.0	0.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:ForwardContracts, us-gaap:Nondesignated

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31
Value	-1700000.0	-1600000.0	2200000.0	-1100000.0	600000.0	-600000.0	-200000.0	-3692000.0	-658000.0	3210000.0	-1378000.0	1208000.0	-2062000.0	-3939000.0	-1368000.0	1502000.0	-330000.0	-371000.0	-1691000.0	713000.0	840000.0	-1378000.0	3131000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	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	0.0	0.0	0.0	0.0	0.0	0.0	0.0	100.0	0.0	0.0

us-gaap:DividendsCommonStockCash

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	4.4	4.2	4.1	4.0	4.0	4.0	4.0	4.0	3.8	3.8	3.8
Percentage of DividendsCommonStockCash	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:Parent

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	4.4	4.2	4.1	4.0	4.0	4.0	4.0	4.0	3.8	3.8	3.8
Percentage of DividendsCommonStockCash	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:RetainedEarnings

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	4.4	4.2	4.1	4.0	4.0	4.0	4.0	4.0	3.8	3.8	3.8
Percentage of DividendsCommonStockCash	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31
Value	3300000.0	1100000.0	-1800000.0	-100000.0	-1600000.0	800000.0	500000.0	-1838000.0	-1689000.0	-1828000.0	1273000.0	599000.0	712000.0	545000.0	330000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	400000.0	-2200000.0	1100000.0	-1800000.0
Percentage of EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	100.0	100.0	100.0	100.0

us-gaap:ExcessTaxBenefitFromShareBasedCompensationOperatingActivities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	200000.0	200000.0	0	0	-100000.0	400000.0	400000.0	500000.0	0	200000.0	-13000.0	246000.0	1800000.0	27000.0	19000.0	5000.0	742000.0	402000.0
Percentage of ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	100.0	100.0	0.0	0.0	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

us-gaap:FinanceLeasePrincipalPayments

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	4300000.0	0	0	100000.0	0	200000.0	200000.0	100000.0
Percentage of FinanceLeasePrincipalPayments	100.0	0.0	0.0	100.0	0.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	500000.0	-300000.0	-900000.0	0	-4100000.0	-100000.0	-600000.0	-200000.0	200000.0	281000.0	-295000.0	-337000.0	-749000.0	-1012000.0	-842000.0	-336000.0	-1197000.0	-567000.0	-149000.0	597000.0	-273000.0	-14000.0	-272000.0	-225000.0	-443000.0	-534000.0	-276000.0	328000.0	-208000.0	375000.0	-303000.0	-419000.0	-324000.0	93000.0	-385000.0	-880000.0	-230000.0	510000.0	-1390000.0	913000.0	527000.0	-470000.0	130000.0	-375000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax us-gaap:DerivativeInstrumentRisk

us-gaap:ForeignExchangeForward

Period End	2021-06-30	2020-06-30
Value	-1500000.0	-2300000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax	0.0	0.0

us-gaap:GainLossOnForeignCurrencyCashFlowHedgeIneffectiveness us-gaap:IncomeStatementLocation

us-gaap:GainLossOnForeignCurrencyCashFlowHedgeIneffectiveness

us-gaap:ForeignCurrencyGainLoss

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-06-30	2017-03-31
Value	-7.3	-3.0	2.7	-4.7	7.1	-2.1	0.0	2.2	0.9	10	5.2	0.0
Percentage of GainLossOnForeignCurrencyCashFlowHedgeIneffectiveness	100.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	0.0

us-gaap:GainLossOnInterestRateCashFlowHedgeIneffectiveness us-gaap:IncomeStatementLocation

us-gaap:GainLossOnInterestRateCashFlowHedgeIneffectiveness

us-gaap:InterestIncome

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	600000.0	800000.0	700000.0	800000.0	700000.0	700000.0	700000.0	700000.0	600000.0	600000.0
Percentage of GainLossOnInterestRateCashFlowHedgeIneffectiveness	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:GainLossOnSaleOfBusiness

Period End	2021-06-30	2021-03-31	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	9800000.0	0	0	0	0	0	0	-87000.0	-62000.0	0	0	0	0
Percentage of GainLossOnSaleOfBusiness	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	0.0	0.0	0.0	0.0

us-gaap:GainLossOnSaleOfBusiness us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:IncomeStatementLocation

tnc:SpecialtyServiceCoatings, us-gaap:SellingGeneralAndAdministrativeExpenses

Period End	2021-03-31
Value	9800000.0
Percentage of GainLossOnSaleOfBusiness	100.0

us-gaap:GoodwillForeignCurrencyTranslationGainLoss

Period End	2021-06-30	2021-03-31	2020-12-31
Value	-3.0	6.9	-20.2
Percentage of GoodwillForeignCurrencyTranslationGainLoss	100.0	100.0	100.0

us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit

Period End	2021-06-30	2021-03-31
Value	0	1700000.0
Percentage of GoodwillWrittenOffRelatedToSaleOfBusinessUnit	0.0	100.0

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName

us-gaap:IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance

us-gaap:ForeignCountry, us-gaap:TaxAndCustomsAdministrationNetherlands

Period End	2021-06-30
Value	-3400000.0
Percentage of IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	100.0

us-gaap:IncreaseDecreaseInAccruedLiabilities

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	5.6	-9.6	4.5	-0.3	2.6	-0.6	1.3	-2.4	0.3	0.86	3.634	-1.962	-1.81	4.541	4.767	3.553	1.699	2.912	0.839	2.566	-6.502	0.47	2.302	2.587	-5.761	2.566	2.454	1.132	-3.37	3.836	-0.109	2.294	-0.469	1.633	1.63	1.342	-3.056	-0.722	2.971	4.461	-4.999	4.891	-0.088
Percentage of IncreaseDecreaseInAccruedLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInDeferredRevenue

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30
Value	7.7	4.8	2.5	17	2.3	2.8	3.1	3.3	3.5
Percentage of IncreaseDecreaseInDeferredRevenue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	13	-5.7	1.9	4.5	4.4	-20.8	5.3	3.6	9.2	-13.6	7.463	1.111	7.478	-3.403	1.682	-1.2	5.368	-13.63	5.572	0.34	3.375	-9.163	-1.638	8.324	2.925	-8.895	0.172	7.226	-0.764	-4.707	-1.558	6.255	-0.139	-8.736	-0.238	5.671	1.872	-10.31	1.043	6.239	3.331	-9.436	1.473	5.295
Percentage of IncreaseDecreaseInEmployeeRelatedLiabilities	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	276440.0	237500.0	379420.0	18692.0	353040.0	312370.0	302740.0	-34802.0	440700.0	428090.0	454370.0	0	441590.0	0	0	14358.0	474400.0	425220.0	433400.0	-421.0	0	474610.0	497840.0	-3053.0	514560.0	508550.0	520910.0	420.0	543810.0	534550.0	545380.0	-3216.0	572330.0	609360.0	506120.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	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	0.0	0.0	100.0	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InvestmentIncomeInterest

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30
Value	700000.0	800000.0	800000.0	800000.0	900000.0	800000.0	800000.0	900000.0	800000.0	495000.0	839000.0	952000.0	749000.0	830000.0	698000.0	793000.0	84000.0	142000.0	107000.0	40000.0	41000.0	27000.0	42000.0	53000.0	50000.0	48000.0	84000.0	95000.0	75000.0	95000.0	67000.0	114000.0	114000.0	198000.0	229000.0	330000.0	310000.0	276000.0	224000.0	184000.0	68000.0	4000.0	52000.0	31000.0
Percentage of InvestmentIncomeInterest	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:InvestmentIncomeInterest us-gaap:DerivativeInstrumentRisk

us-gaap:ForeignExchangeForward

Period End	2021-06-30	2020-06-30
Value	500000.0	600000.0
Percentage of InvestmentIncomeInterest	0.0	75.0

us-gaap:InvestmentIncomeInterest us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ForeignExchangeOption, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-03-31
Value	5600000.0
Percentage of InvestmentIncomeInterest	800.0

us-gaap:LineOfCreditFacilityCommitmentFeeAmount us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityCommitmentFeeAmount

tnc:The2017CreditAgreement

Period End	2021-03-31
Value	200000.0
Percentage of LineOfCreditFacilityCommitmentFeeAmount	100.0

us-gaap:LineOfCreditFacilityCommitmentFeePercentage us-gaap:Range, us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:LineOfCreditFacilityCommitmentFeePercentage

srt:Maximum, us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement

Period End	2021-04-05
Value	0.3
Percentage of LineOfCreditFacilityCommitmentFeePercentage	100.0

srt:Minimum, us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement

Period End	2021-04-05
Value	0.15
Percentage of LineOfCreditFacilityCommitmentFeePercentage	50.0

us-gaap:LineOfCreditFacilityCommitmentFeePercentage us-gaap:Range, us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

srt:Maximum, us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	0.3
Percentage of LineOfCreditFacilityCommitmentFeePercentage	100.0

srt:Minimum, us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	0.15
Percentage of LineOfCreditFacilityCommitmentFeePercentage	50.0

us-gaap:OperatingLeasePayments

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	2019-03-31
Value	5.4	5.1	4.9	5.0	4.6	5.2	17	11	5.7
Percentage of OperatingLeasePayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	6.6	2.4	-5.0	5.8	-5.3	1.4	1.6	3.135	-1.666	-9.806	2.702	0.716	4.735	4.203	2.293	-6.077	0.362
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	4.9	-10.7
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	0.0	0.0

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	-1.3	6.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	0.0	0.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	-5.8	-2.1	6.3	-2.8	7.2	-0.1	4.0	4.236	1.164	9.406	-5.681	-2.216	-4.532	-9.564	-0.107	-0.008	-0.029
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-87.9	-87.5	-126.0	-48.3	-135.8	-7.1	250.0	135.1	-69.9	-95.9	-210.3	-309.5	-95.7	-227.6	-4.7	0.1	-8.0

us-gaap:AccumulatedTranslationAdjustment

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	12	4.5	-11.3	9.0	-12.5	1.5	-2.4	-2.375	-2.83	-19.212	8.364	3.593	9.033	13	2.4	-4.254	0.391
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	187.9	187.5	226.0	155.2	235.8	107.1	-150.0	-75.8	169.9	195.9	309.5	501.8	190.8	324.5	104.7	70.0	108.0

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	3.7	-4.7
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	0.0	0.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31
Value	0	0	100000.0	1100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationTax	0.0	0.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax

us-gaap:ForeignCurrencyGainLoss

Period End	2021-03-31	2020-03-31
Value	7300000.0	2700000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	100.0	100.0

us-gaap:InterestIncome

Period End	2021-03-31	2020-03-31
Value	600000.0	700000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	8.2	25.9

us-gaap:Sales

Period End	2021-03-31
Value	-100000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	-1.4

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30
Value	-800000.0	-500000.0	4800000.0	300000.0	1700000.0	1300000.0	1400000.0	2708000.0	-28000.0	1376000.0	-2715000.0	-1420000.0	-1732000.0	-4506000.0	-73000.0	89000.0	35000.0	18000.0	-447000.0	93000.0	71000.0	0	0	0	0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30
Value	-200000.0	-100000.0	1100000.0	100000.0	400000.0	300000.0	300000.0	623000.0	-6000.0	319000.0	501000.0	-530000.0	-646000.0	-1681000.0	-27000.0	33000.0	13000.0	7000.0	-167000.0	34000.0	27000.0	0	0	0	0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	11	12	3.8	-11.3	9.0	-12.6	1.3	-2.3	-2.019	-3.11	-19.473	8.381	3.283	9.033	13	2.4	-4.271	0.381	0.403	3.596	-0.765	-5.559	1.945	-8.141	-5.0	-6.963	0.814	1.037	-1.021	2.696	-2.505	-1.412
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	-300000.0	100000.0	-1800000.0	-300000.0	-700000.0	0	0	-100000.0	-100000.0	100000.0	356000.0	-280000.0	-261000.0	17000.0	-310000.0	0	0	0	-17000.0	-10000.0	1000.0	-6000.0	108000.0	-134000.0	0	1000.0	-6000.0	6000.0	1000.0	-14000.0	7000.0	1000.0	7000.0	0
Percentage of OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	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	0.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

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	4.9	-10.7	11	4.1	-7.6	-11.2	2.4	-1.3	-2.8	-18.2	5.1
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome

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	4.9	-10.7	11	4.1	-7.6	-11.2	2.4	-1.3	-2.8	-18.2	5.1
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:Parent

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	4.9	-10.7	11	4.1	-7.6	-11.2	2.4	-1.3	-2.8	-18.2	5.1
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax

Period End	2021-06-30	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	-100000.0	-93000.0	-658000.0	-256000.0	2398000.0	-246000.0	-249000.0	-255000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

Period End	2021-06-30	2020-06-30	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31
Value	-100000.0	0	100000.0	0	0	0	-311000.0	-2000.0	-3000.0	-151000.0	-1927000.0	-138000.0	-4000.0	-18000.0	527000.0	-9000.0	-7000.0	-7000.0	-1020000.0	-82000.0	-62000.0	-101000.0	1910000.0	-17000.0	-17000.0	-17000.0	-4749000.0	89000.0	0	-2000.0
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	100.0	0.0	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	100.0	100.0	100.0	0.0	100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:DerivativeInstrumentsGainLossByHedgingRelationship

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax

us-gaap:ForeignExchangeOption, us-gaap:CashFlowHedging

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31
Value	-0.1	-0.3	0.3	-0.1	0.0	-0.1	-0.1	0.1	0.0	0.0	0.0
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	100.0	100.0	100.0	100.0	0.0	100.0	100.0	100.0	0.0	0.0	0.0

us-gaap:ForwardContracts, us-gaap:CashFlowHedging

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30
Value	-5.8	-1.8	6.0	-2.7	7.2	0.0	4.1	4.125	1.2	9.4
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	5800.0	600.0	2000.0	2700.0	0.0	-0.0	-4100.0	4125.0	0.0	0.0

us-gaap:OtherNoncashIncomeExpense

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	100000.0	-1400000.0	600000.0	-500000.0	-1000000.0	-300000.0	-1800000.0	800000.0	100000.0	-200000.0	-23000.0	739000.0	-143000.0	-137000.0	-189000.0	-111000.0	-46000.0	-18000.0	-73000.0	355000.0	123000.0	-60000.0	-2000.0	28000.0	29000.0	45000.0	-69000.0	58000.0	-22000.0	9000.0	-64000.0	-156000.0	-4000.0	5000.0	-4000.0	111000.0	44000.0	-25000.0	-908000.0	15000.0	391000.0	-6000.0	-500000.0	11000.0
Percentage of OtherNoncashIncomeExpense	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities

Period End	2021-06-30	2021-03-31
Value	0	500000.0
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities	0.0	100.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities us-gaap:BusinessAcquisition

tnc:Gaomei

Period End	2021-03-31
Value	500000.0
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities	100.0

us-gaap:PaymentForContingentConsiderationLiabilityFinancingActivities us-gaap:StatementScenario, us-gaap:BusinessAcquisition

srt:ScenarioForecast, tnc:Gaomei

Period End	2021-06-30	2021-03-31
Value	1300000.0	1800000.0
Percentage of PaymentForContingentConsiderationLiabilityFinancingActivities	0.0	360.0

us-gaap:PaymentsForRestructuring

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-06-30	2015-03-31
Value	300000.0	900000.0	1200000.0	2000000.0	1300000.0	900000.0	1100000.0	700000.0	600000.0	100000.0	429000.0	575000.0	405000.0	714000.0	597000.0	444000.0	403000.0	468000.0	185000.0	149000.0
Percentage of PaymentsForRestructuring	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PaymentsToAcquireIntangibleAssets

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
Value	0.1	0.0	0.0	0.0	0.1	0.0	0.1	0.2	0.2	0.168	1.412	0.195	1.0	0.0	0.0	0.0	2.5	0.0	0.0	0.0	0.0
Percentage of PaymentsToAcquireIntangibleAssets	100.0	0.0	0.0	0.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0

us-gaap:ProceedsFromDivestitureOfBusinesses

Period End	2021-06-30	2021-03-31	2019-12-31	2018-12-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31
Value	0.0	24	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.285	-0.003	1.188	0.0	0.0	-0.002	1.418	0.0	0.0	0.741	2.821	0.0	0.699	0.0	1.014	0.0	0.0	0.0
Percentage of ProceedsFromDivestitureOfBusinesses	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	0.0	0.0	100.0	100.0	0.0	100.0	0.0	100.0	0.0	0.0	0.0

us-gaap:ProceedsFromIssuanceOfCommonStock

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	200000.0	3100000.0	1300000.0	1000000.0	200000.0	2400000.0	3300000.0	1600000.0	600000.0	600000.0	145000.0	2011000.0	2930000.0	794000.0	2147000.0	885000.0	2188000.0	1655000.0	2378000.0	1697000.0	692000.0	504000.0	696000.0	179000.0	252000.0	550000.0	619000.0	945000.0	479000.0	226000.0	2319000.0	2182000.0	1017000.0	2795000.0	1369000.0	846000.0	328000.0	1624000.0	957000.0	1475000.0	389000.0	1393000.0	1760000.0	1614000.0
Percentage of ProceedsFromIssuanceOfCommonStock	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProceedsFromSaleOfPropertyPlantAndEquipment

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	0	0	0	100000.0	0	100000.0	0	0	4000.0	6000.0	86000.0	16000.0	55000.0	28000.0	2375000.0	53000.0	56000.0	132000.0	362000.0	65000.0	79000.0	67000.0	104000.0	86000.0	56000.0	117000.0	78000.0	40000.0	23000.0	37000.0	21000.0	39000.0	748000.0	-254000.0	396000.0	138000.0	116000.0	230000.0	80000.0	175000.0	29000.0	98000.0
Percentage of ProceedsFromSaleOfPropertyPlantAndEquipment	0.0	0.0	0.0	100.0	0.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ProvisionForDoubtfulAccounts

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30
Value	300000.0	600000.0	1100000.0	200000.0	600000.0	100000.0	900000.0	700000.0	800000.0	100000.0	-67000.0	-105000.0	217000.0	723000.0	619000.0	286000.0	446000.0	251000.0	-311000.0	173000.0	700000.0	-94000.0	-337000.0	180000.0	1107000.0	139000.0	256000.0	472000.0	347000.0	429000.0	126000.0	450000.0	390000.0	313000.0	-101000.0	380000.0	862000.0	286000.0	1132000.0	105000.0	313000.0	329000.0	197000.0	350000.0
Percentage of ProvisionForDoubtfulAccounts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31
Value	-5200000.0	-1700000.0	2600000.0	-3000000.0	5900000.0	-1000000.0	2900000.0	2096000.0	1176000.0	8341000.0	-3640000.0	-5387000.0	-3453000.0	-6760000.0	-53000.0	-97000.0	-65000.0	-96000.0	46000.0	-285000.0	-138000.0	-104000.0	-171000.0	-258000.0	-29000.0	-30000.0	-28000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	-1200000.0	6000000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0.0	0.0

us-gaap:AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedges

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30
Value	-5200000.0	-1700000.0	2600000.0	-3000000.0	5900000.0	-1000000.0	2900000.0	2151000.0	1186000.0	8349000.0	-3591000.0	-1326000.0	-3446000.0	-6739000.0	-61000.0	-64000.0	-51000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	102.6	100.9	100.1	98.7	24.6	99.8	99.7	115.1	66.0	78.5

us-gaap:AociIncludingPortionAttributableToNoncontrollingInterest

Period End	2021-06-30	2021-03-31
Value	-1200000.0	6000000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	0.0	0.0

us-gaap:RepaymentsOfDebt

Period End	2021-03-31	2020-03-31
Value	0.2	0.3
Percentage of RepaymentsOfDebt	100.0	100.0

us-gaap:RestructuringCharges

Period End	2020-09-30	2020-03-31
Value	3100000.0	2000000.0
Percentage of RestructuringCharges	100.0	100.0

us-gaap:RestructuringCharges us-gaap:IncomeStatementLocation

us-gaap:CostOfSales

Period End	2020-09-30	2020-03-31
Value	1200000.0	300000.0
Percentage of RestructuringCharges	38.7	15.0

us-gaap:SellingGeneralAndAdministrativeExpenses

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2017-12-31	2017-03-31
Value	1900000.0	300000.0	800000.0	200000.0	0	0	4300000.0	2501000.0	8018000.0
Percentage of RestructuringCharges	61.3	0.0	40.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:RestructuringCharges us-gaap:IncomeStatementLocation, us-gaap:RestructuringCostAndReserve

us-gaap:SellingGeneralAndAdministrativeExpenses, us-gaap:EmployeeSeverance

Period End	2021-06-30	2020-12-31	2020-03-31
Value	900000.0	3500000.0	1700000.0
Percentage of RestructuringCharges	0.0	0.0	85.0

us-gaap:RestructuringCharges us-gaap:IncomeStatementLocation, us-gaap:RestructuringPlan

us-gaap:OtherRestructuring, tnc:Japan

Period End	2020-09-30
Value	100000.0
Percentage of RestructuringCharges	3.2

us-gaap:RestructuringCharges us-gaap:RestructuringCostAndReserve

us-gaap:EmployeeSeverance

Period End	2020-09-30	2020-03-31
Value	1400000.0	1300000.0
Percentage of RestructuringCharges	45.2	65.0

us-gaap:OtherRestructuring

Period End	2020-09-30	2020-03-31
Value	1700000.0	700000.0
Percentage of RestructuringCharges	54.8	35.0

us-gaap:RestructuringReserveTranslationAdjustment

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2016-09-30	2016-06-30	2016-03-31	2015-06-30	2015-03-31	2012-06-30	2012-03-31
Value	0	100000.0	-300000.0	500000.0	-1200000.0	-33000.0	-11000.0	-157000.0	104000.0	13000.0	-31000.0	52000.0	7000.0	-39000.0	2000.0	-7000.0
Percentage of RestructuringReserveTranslationAdjustment	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

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-09-30	2019-06-30	2019-03-31
Value	4.6	5.5	2.3	2.4	18	12	2.2
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue

us-gaap:RestrictedStock

Period End	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31
Value	0	0	0	700000.0	0	0	0	1000000.0	115000.0	0	69000.0	794000.0	168000.0	45000.0	625000.0	625000.0	135000.0	111000.0	703000.0	1021000.0	154000.0	67000.0	22000.0	811000.0	0	0	20000.0	807000.0	0	105000.0	35000.0	503000.0	337000.0	223000.0	8000.0	293000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	0.0	0.0	0.0	100.0	0.0	0.0	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	0.0	0.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

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	1321.0	3399.0	15756.0	1560.0	3310.0	6952.0	1327.0	3360.0	4151.0
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StandardProductWarrantyAccrualForeignCurrencyTranslationGainLoss

Period End	2021-06-30	2021-03-31	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31
Value	0	100000.0	200000.0	-200000.0	100000.0	-200000.0	100000.0	0	21000.0	-40000.0	-239000.0	86000.0	49000.0	71000.0	104000.0	50000.0	-3000.0	37000.0	-12000.0	60000.0
Percentage of StandardProductWarrantyAccrualForeignCurrencyTranslationGainLoss	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

us-gaap:StandardProductWarrantyAccrualPayments

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31
Value	1.8	2.9	5.0	3.3	2.2	3.1	2.7	2.9	2.9	3.0	2.809	3.314	3.203	3.288	2.978	3.04	3.072	2.8	2.963	2.941	3.0	2.766	3.05	2.846	2.711	2.498	2.568	2.883	2.558	2.358	17	-2.649	-2.6	-2.455	-2.899	-14.464	8.746	-2.929	-2.613	-14.026	8.183	-2.59
Percentage of StandardProductWarrantyAccrualPayments	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StandardProductWarrantyAccrualWarrantiesIssued

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31
Value	1.7	2.6	5.0	3.2	1.3	2.4	1.4	4.3	2.9	2.5	2.289	3.656	3.893	3.334	3.245	3.064	3.743	2.072	3.525	2.942	3.458	2.488	3.06	2.989	3.257	2.413	2.816	2.662	2.996	2.131	2.41	2.661	3.278	2.3	3.011	3.072	3.385	2.927	3.411	3.094	3.43	2.88
Percentage of StandardProductWarrantyAccrualWarrantiesIssued	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock

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	17687.0	20647.0	98805.0	61531.0	31947.0	35338.0	48863.0	163270.0	29263.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

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	1900000.0	1400000.0	900000.0	0	1100000.0	1500000.0	300000.0	200000.0	1900000.0	2700000.0	500000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital

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	1900000.0	1300000.0	900000.0	0	1100000.0	1500000.0	300000.0	200000.0	1900000.0	2600000.0	500000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation	100.0	92.9	100.0	0.0	100.0	100.0	100.0	100.0	100.0	96.3	100.0

us-gaap:CommonStock

Period End	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
Value	100000.0	0	0	0	0	0	0	100000.0	0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation	7.1	0.0	0.0	0.0	0.0	0.0	0.0	3.7	0.0

us-gaap:Parent

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	1900000.0	1400000.0	900000.0	0	1100000.0	1500000.0	300000.0	200000.0	1900000.0	2700000.0	500000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation	100.0	100.0	100.0	0.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:DebtInstrument

us-gaap:WriteOffOfDeferredDebtIssuanceCost

tnc:SeniorUnsecuredNotes

Period End	2021-06-30
Value	2.9
Percentage of WriteOffOfDeferredDebtIssuanceCost	100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnc:SeniorUnsecuredNotes, us-gaap:SubsequentEvent

Period End	2021-04-02
Value	2.8
Percentage of WriteOffOfDeferredDebtIssuanceCost	0.0

dei:EntityCommonStockSharesOutstanding

Period End	2020-10-23
Value	18
Percentage of EntityCommonStockSharesOutstanding	100.0

tnc:AccruedFreightCurrent

Period End	2020-12-31	2019-12-31
Value	4600000.0	4900000.0
Percentage of AccruedFreightCurrent	100.0	100.0

tnc:AggregateResidualValueAtLeaseExpirationForVehicleLeases

Period End	2020-12-31
Value	10
Percentage of AggregateResidualValueAtLeaseExpirationForVehicleLeases	100.0

tnc:AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	3900000.0	3900000.0	3200000.0	3600000.0	3200000.0	3000000.0	2700000.0	2500000.0	2203000.0	2655000.0	2706000.0	3241000.0	2972000.0	2992000.0	2641000.0	3108000.0	3963000.0	3886000.0	3410000.0	3615000.0	4317000.0	4366000.0	3849000.0	3936000.0	5008000.0	4867000.0	4757000.0	4526000.0	4605000.0	4301000.0	4246000.0	4399000.0	4778000.0	4946000.0	4902000.0	4828.0	4622000.0	4805000.0	4311000.0
Percentage of AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:DebtCurrentNetOfUnamortizedDebtIssuanceCosts us-gaap:LongtermDebtType

tnc:DebtCurrentNetOfUnamortizedDebtIssuanceCosts

us-gaap:LineOfCredit

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2016-12-31
Value	16	42	1.1	31	20	8.3	30	27	29	29	29	29	3.459
Percentage of DebtCurrentNetOfUnamortizedDebtIssuanceCosts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:DebtInstrumentAmountRedeemed us-gaap:DebtInstrument

tnc:DebtInstrumentAmountRedeemed

tnc:SeniorUnsecuredNotes

Period End	2021-06-30
Value	300
Percentage of DebtInstrumentAmountRedeemed	100.0

tnc:DebtInstrumentCovenantAdjustedEBITDAtoInterestExpenseRatioMaximum us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

tnc:DebtInstrumentCovenantAdjustedEBITDAtoInterestExpenseRatioMaximum

tnc:JPMorgan2017CreditAgreement, us-gaap:RevolvingCreditFacility

Period End	2020-09-30
Value	3.5
Percentage of DebtInstrumentCovenantAdjustedEBITDAtoInterestExpenseRatioMaximum	100.0

tnc:DebtInstrumentCovenantIndebtednesstoAdjustedEBITDARatioMaximum us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

tnc:DebtInstrumentCovenantIndebtednesstoAdjustedEBITDARatioMaximum

tnc:JPMorgan2017CreditAgreement, us-gaap:RevolvingCreditFacility

Period End	2020-09-30
Value	4.0
Percentage of DebtInstrumentCovenantIndebtednesstoAdjustedEBITDARatioMaximum	100.0

tnc:DebtInstrumentCovenantMinimumPermittedAcquisitionAlternativeRequirementsForIndebtednessToEBITDARatio us-gaap:DebtInstrument

tnc:DebtInstrumentCovenantMinimumPermittedAcquisitionAlternativeRequirementsForIndebtednessToEBITDARatio

tnc:The2021CreditAgreement

Period End	2021-04-05
Value	50
Percentage of DebtInstrumentCovenantMinimumPermittedAcquisitionAlternativeRequirementsForIndebtednessToEBITDARatio	100.0

tnc:DebtInstrumentCovenantMinimumPermittedAcquisitionAlternativeRequirementsForIndebtednessToEBITDARatio us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnc:The2021CreditAgreement, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	50
Percentage of DebtInstrumentCovenantMinimumPermittedAcquisitionAlternativeRequirementsForIndebtednessToEBITDARatio	100.0

tnc:DebtInstrumentCovenantSeniorSecuredNetIndebtednesstoAdjustedEBITDARatioMaximum us-gaap:LineOfCreditFacility, us-gaap:LongtermDebtType

tnc:DebtInstrumentCovenantSeniorSecuredNetIndebtednesstoAdjustedEBITDARatioMaximum

tnc:JPMorgan2017CreditAgreement, us-gaap:RevolvingCreditFacility

Period End	2020-09-30
Value	3.5
Percentage of DebtInstrumentCovenantSeniorSecuredNetIndebtednesstoAdjustedEBITDARatioMaximum	100.0

tnc:DebtInstrumentRedemptionPremium us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnc:DebtInstrumentRedemptionPremium

tnc:SeniorUnsecuredNotes, us-gaap:SubsequentEvent

Period End	2021-04-02
Value	8400000.0
Percentage of DebtInstrumentRedemptionPremium	100.0

tnc:DebtInstrumentRestrictionsMaximumDividendsPayoutOrRepurchaseOfStock us-gaap:DebtInstrument

tnc:DebtInstrumentRestrictionsMaximumDividendsPayoutOrRepurchaseOfStock

tnc:The2021CreditAgreement

Period End	2021-04-05
Value	60
Percentage of DebtInstrumentRestrictionsMaximumDividendsPayoutOrRepurchaseOfStock	100.0

tnc:DebtInstrumentRestrictionsMaximumDividendsPayoutOrRepurchaseOfStock us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnc:The2021CreditAgreement, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	60
Percentage of DebtInstrumentRestrictionsMaximumDividendsPayoutOrRepurchaseOfStock	100.0

tnc:DebtInstrumentUnamortizedDebtIssuanceCostsNoncurrentnet

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2016-12-31
Value	3200000.0	3500000.0	3600000.0	3800000.0	4000000.0	4200000.0	4500000.0	4724000.0	5020000.0	5442000.0	6094000.0	6440000.0	-7138000.0	-7415000.0	0
Percentage of DebtInstrumentUnamortizedDebtIssuanceCostsNoncurrentnet	100.0	100.0	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

tnc:DebtInstrumentVariableRateFloor us-gaap:DebtInstrument, us-gaap:SubsequentEventType, us-gaap:VariableRate

tnc:DebtInstrumentVariableRateFloor

tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, tnc:LiborOnEurocurrencyLiabilities

Period End	2021-04-05
Value	0
Percentage of DebtInstrumentVariableRateFloor	0.0

tnc:The2021CreditAgreement, us-gaap:SubsequentEvent, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-04-05
Value	1.0
Percentage of DebtInstrumentVariableRateFloor	0.0

tnc:DebtInstrumentVariableRateFloor us-gaap:DebtInstrument, us-gaap:VariableRate

tnc:The2021CreditAgreement, tnc:LiborOnEurocurrencyLiabilities

Period End	2021-04-05
Value	0
Percentage of DebtInstrumentVariableRateFloor	0.0

tnc:The2021CreditAgreement, us-gaap:LondonInterbankOfferedRateLIBOR

Period End	2021-04-05
Value	1.0
Percentage of DebtInstrumentVariableRateFloor	0.0

tnc:DebtWeightedAverageInterestRateNetOfCurrencySwapContract

Period End	2021-06-30	2021-03-31	2020-12-31
Value	3.1	4.4	4.5
Percentage of DebtWeightedAverageInterestRateNetOfCurrencySwapContract	100.0	100.0	100.0

tnc:DebtWeightedAverageInterestRatenetofCurrencySwapContract

Period End	2020-09-30
Value	4.3
Percentage of DebtWeightedAverageInterestRatenetofCurrencySwapContract	100.0

tnc:DeferredTaxAssetsOperatingLeaseLiability

Period End	2020-12-31	2019-12-31
Value	11	11
Percentage of DeferredTaxAssetsOperatingLeaseLiability	100.0	100.0

tnc:DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

tnc:DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	1.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	100.0

tnc:DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	7.4	3.0	2.8	2.847
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	740.0	0.0	0.0	0.0

tnc:DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	5.6	6.2	7.255	7.424
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsTotal	560.0	0.0	0.0	0.0

tnc:FinitelivedIntangibleAssetExpectedAmortizationAfterYearFour

Period End	2021-06-30	2021-03-31
Value	40	40
Percentage of FinitelivedIntangibleAssetExpectedAmortizationAfterYearFour	100.0	100.0

tnc:InventoryFinishedGoodsFifo

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	56	62	60	60	60	63	64	53	53	51	55	54	56	57	34	31	31	29	29	32	32	31	29	29	30	32	33	31	31	28	30	25	25	28	28	31	23
Percentage of InventoryFinishedGoodsFifo	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:InventoryFinishedGoodsLifo

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	44	53	51	50	54	52	54	48	48	49	47	43	47	45	43	39	43	44	44	41	45	44	45	41	46	41	39	36	37	35	35	33	36	36	35	32	31
Percentage of InventoryFinishedGoodsLifo	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:InventoryRawMaterialsProductionPartsAndWorkInProcessFifo

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	39	39	44	40	43	41	39	35	39	38	39	34	41	41	13	12	13	13	15	13	13	13	12	12	13	13	13	12	12	12	11	12	12	14	14	12	17
Percentage of InventoryRawMaterialsProductionPartsAndWorkInProcessFifo	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:InventoryRawMaterialsProductionPartsAndWorkInProcessLifo

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	25	26	31	32	35	33	31	28	28	29	26	23	24	25	25	23	25	22	21	22	24	25	26	24	20	18	14	13	13	13	13	14	15	16	17	16	15
Percentage of InventoryRawMaterialsProductionPartsAndWorkInProcessLifo	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

tnc:LeaseLiability

Period End	2020-12-31	2019-12-31
Value	45	47
Percentage of LeaseLiability	100.0	100.0

tnc:LeaseLiabilityPaymentDue

Period End	2020-12-31
Value	48
Percentage of LeaseLiabilityPaymentDue	100.0

tnc:LeaseLiabilityToBePaidAfterYearFive

Period End	2020-12-31
Value	900000.0
Percentage of LeaseLiabilityToBePaidAfterYearFive	100.0

tnc:LeaseLiabilityToBePaidYearFive

Period End	2020-12-31
Value	2100000.0
Percentage of LeaseLiabilityToBePaidYearFive	100.0

tnc:LeaseLiabilityToBePaidYearFour

Period End	2020-12-31
Value	5000000.0
Percentage of LeaseLiabilityToBePaidYearFour	100.0

tnc:LeaseLiabilityToBePaidYearOne

Period End	2020-12-31
Value	17
Percentage of LeaseLiabilityToBePaidYearOne	100.0

tnc:LeaseLiabilityToBePaidYearThree

Period End	2020-12-31
Value	9400000.0
Percentage of LeaseLiabilityToBePaidYearThree	100.0

tnc:LeaseLiabilityToBePaidYearTwo

Period End	2020-12-31
Value	13
Percentage of LeaseLiabilityToBePaidYearTwo	100.0

tnc:LeaseLiabilityUndiscountedExcessAmount

Period End	2020-12-31
Value	3000000.0
Percentage of LeaseLiabilityUndiscountedExcessAmount	100.0

tnc:LeaseRightOfUseAsset

Period End	2020-12-31	2019-12-31
Value	44	46
Percentage of LeaseRightOfUseAsset	100.0	100.0

tnc:LineOfCreditFacilityAdditionalBorrowingsOption us-gaap:CreditFacility, us-gaap:DebtInstrument

tnc:LineOfCreditFacilityAdditionalBorrowingsOption

us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement

Period End	2021-04-05
Value	275
Percentage of LineOfCreditFacilityAdditionalBorrowingsOption	100.0

tnc:LineOfCreditFacilityAdditionalBorrowingsOption us-gaap:CreditFacility, us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	275
Percentage of LineOfCreditFacilityAdditionalBorrowingsOption	100.0

tnc:OperatingLossCarryforwardsNotSubjectToExpiration us-gaap:IncomeTaxAuthority

tnc:OperatingLossCarryforwardsNotSubjectToExpiration

us-gaap:ForeignCountry

Period End	2020-12-31
Value	18
Percentage of OperatingLossCarryforwardsNotSubjectToExpiration	100.0

tnc:OperatingLossCarryforwardsSubjectToExpiration us-gaap:IncomeTaxAuthority

tnc:OperatingLossCarryforwardsSubjectToExpiration

us-gaap:ForeignCountry

Period End	2020-12-31
Value	22
Percentage of OperatingLossCarryforwardsSubjectToExpiration	100.0

tnc:RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueThereafter

Period End	2020-09-30
Value	100000.0
Percentage of RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueThereafter	100.0

tnc:RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinFiveYears

Period End	2020-09-30
Value	400000.0
Percentage of RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinFiveYears	100.0

tnc:RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinFourYears

Period End	2020-09-30
Value	800000.0
Percentage of RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinFourYears	100.0

tnc:RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinThreeYears

Period End	2020-09-30
Value	1600000.0
Percentage of RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinThreeYears	100.0

tnc:RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinTwoYears

Period End	2020-09-30
Value	2700000.0
Percentage of RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedDueinTwoYears	100.0

tnc:RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedRemainderofFiscalYear

Period End	2020-09-30
Value	4600000.0
Percentage of RevenueFromContractWithCustomerFuturePerformanceObligationsSatisfiedRemainderofFiscalYear	100.0

us-gaap:AccountsAndOtherReceivablesNetCurrent

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	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	194	199	201	184	207	223	212	232	213	216	208	215	212	209	149	140	152	140	139	146	130	138	124	135	123	128	128	140	127
Percentage of AccountsAndOtherReceivablesNetCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	12	10	12	14	7.122	5.03	7.052	6.565	4.768	5.629	5.654
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

us-gaap:AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2014-12-31	2013-12-31
Value	1200000.0	1800000.0	2200000.0	-1500000.0	-1700000.0	-3000000.0	-3900000.0	-5031000.0	-7116000.0	-7094000.0	-8151000.0	-4935000.0	-4045000.0	-2959000.0	-134000.0	-88000.0	-144000.0	-166000.0	-177000.0	103000.0	44000.0	0	0
Percentage of AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	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

us-gaap:AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2012-12-31	2011-12-31
Value	1.7	1.7	0.7	0.7	0.7	0.7	0.3	0.3	0.3	0.332	1.661	1.671	1.679	1.61	5.01	5.251	5.399	5.391	3.609	3.623	3.635	3.647	6.09	6.228	6.332	6.503	2.893	2.922	2.952	2.98	10	8.954
Percentage of AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax

Period End	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	-29.8	-19.1	-30.7	-43.1	-47.6	-36.3	-45.3	-32.8	-34.3	-31.831	-29.456	-26.626	-7.414	-15.778	-19.371	-28.404	-42.044	-44.444	-40.19	-40.581	-40.983	-44.585	-43.712	-38.287	-40.232	-32.09	-27.096	-20.127	-20.94	-21.991	19	20	17
Percentage of AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31
Value	3900000.0	3900000.0	3600000.0	3600000.0
Percentage of AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables	100.0	100.0	100.0	100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	5100000.0	4900000.0	4600000.0	3600000.0
Percentage of AllowanceForDoubtfulAccountsReceivableCurrent	100.0	100.0	100.0	100.0

us-gaap:AociLossCashFlowHedgeCumulativeGainLossAfterTax

Period End	2021-03-31	2020-12-31	2019-12-31	2018-12-31
Value	700000.0	700000.0	-1500000.0	-5000000.0
Percentage of AociLossCashFlowHedgeCumulativeGainLossAfterTax	100.0	100.0	100.0	100.0

us-gaap:AssetsFairValueDisclosure

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	3.0	3.4	3.0	6.4
Percentage of AssetsFairValueDisclosure	100.0	100.0	100.0	100.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel2

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30
Value	3.0	3.4	3.0	5.0	6.3	8.4	6.4	7.7	7.1	7.9	7.455	7.804	8.229	6.265	7.746	8.952	10	0.103	0.196	0.154	0.117	0.137	0.671	0.633	0.08	0.443	0.13	0.108	0.018	0.01	0.016	0.018	0.704	0.253	0.388	0.053
Percentage of AssetsFairValueDisclosure	100.0	100.0	100.0	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AssetsFairValueDisclosure us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	5.0	6.3	8.4	6.4	7.7	7.1	7.9	7.455	7.804	8.229	6.265	7.746	8.952	10	0.103	0.196	0.154	0.117
Percentage of AssetsFairValueDisclosure	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation us-gaap:DisposalGroupClassification, us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperation

us-gaap:DiscontinuedOperationsHeldforsale, tnc:SpecialtyServiceCoatings

Period End	2020-12-31
Value	15
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperation	100.0

us-gaap:BusinessCombinationContingentConsiderationLiability

Period End	2020-12-31	2019-12-31
Value	1.8	2.1
Percentage of BusinessCombinationContingentConsiderationLiability	100.0	100.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ContingentConsiderationTypeDomain, us-gaap:FairValueInputsLevel3

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31
Value	1.9	1.8	2.1	2.1	2.9	6.6	4.3
Percentage of BusinessCombinationContingentConsiderationLiability	0.0	0.0	0.0	100.0	0.0	0.0	0.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:ContingentConsiderationTypeDomain, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2019-01-04
Value	1.9	1.8	2.1	2.1	2.9	6.6	4.3	4.5
Percentage of BusinessCombinationContingentConsiderationLiability	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0

us-gaap:BusinessCombinationContingentConsiderationLiability us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:FairValueInputsLevel3

Period End	2020-12-31	2019-12-31
Value	1.8	2.1
Percentage of BusinessCombinationContingentConsiderationLiability	100.0	100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2018-12-31	2017-12-31
Value	135	175	141	99	192	74	86	59
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsDisposalGroupIncludingDiscontinuedOperations	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerLiability us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiability

us-gaap:Maintenance

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	10	10.0	9.3	10	10	10	8.5
Percentage of ContractWithCustomerLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerLiabilityNoncurrent us-gaap:ProductOrService, us-gaap:BalanceSheetLocation

us-gaap:ContractWithCustomerLiabilityNoncurrent

us-gaap:Maintenance, us-gaap:OtherLiabilities

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	3500000.0	3500000.0	3400000.0	3900000.0
Percentage of ContractWithCustomerLiabilityNoncurrent	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerRefundLiability

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	13	10	10	16	13	12	10	16	13	11	7.925	13
Percentage of ContractWithCustomerRefundLiability	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ContractWithCustomerRefundLiability us-gaap:ProductOrService

tnc:SalesIncentives

Period End	2021-06-30	2021-03-31	2020-12-31	2020-06-30	2020-03-31	2019-12-31	2018-12-31
Value	14	11	12	10	10	13	16
Percentage of ContractWithCustomerRefundLiability	0.0	0.0	0.0	100.0	100.0	82.0	100.0

us-gaap:ContractWithCustomerRefundLiabilityCurrent

Period End	2020-12-31	2019-12-31	2018-12-31
Value	12	13	16
Percentage of ContractWithCustomerRefundLiabilityCurrent	100.0	100.0	100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DebtInstrumentCarryingAmount

us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement

Period End	2021-06-30	2020-12-31
Value	168	10.0
Percentage of DebtInstrumentCarryingAmount	100.0	100.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument

tnc:The2017CreditAgreement

Period End	2021-03-31	2020-12-31	2019-12-31
Value	10.0	10.0	40
Percentage of DebtInstrumentCarryingAmount	0.0	100.0	0.0

us-gaap:DebtInstrumentCarryingAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

tnc:The2021CreditAgreement, tnc:TermLoan

Period End	2021-06-30
Value	100
Percentage of DebtInstrumentCarryingAmount	59.5

us-gaap:DebtInstrumentCarryingAmount us-gaap:LongtermDebtType

us-gaap:SecuredDebt

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	1.1	1.2	1.5	2.4
Percentage of DebtInstrumentCarryingAmount	0.7	0.0	15.0	0.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType

us-gaap:DebtInstrumentFaceAmount

tnc:The2021CreditAgreement, tnc:TermLoan

Period End	2021-04-05
Value	100
Percentage of DebtInstrumentFaceAmount	100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

tnc:The2021CreditAgreement, tnc:TermLoan, us-gaap:SubsequentEvent

Period End	2021-04-05
Value	100
Percentage of DebtInstrumentFaceAmount	100.0

us-gaap:DebtInstrumentFairValue

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2019-12-31
Value	268	320	323	337	345	357
Percentage of DebtInstrumentFairValue	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount us-gaap:CreditFacility, us-gaap:DebtInstrument

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount

us-gaap:RevolvingCreditFacility, tnc:The2021CreditAgreement

Period End	2021-06-30
Value	278
Percentage of DebtInstrumentUnusedBorrowingCapacityAmount	100.0

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount us-gaap:DebtInstrument

tnc:The2017CreditAgreement

Period End	2021-03-31	2020-12-31
Value	186	186
Percentage of DebtInstrumentUnusedBorrowingCapacityAmount	0.0	0.0

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount us-gaap:LongtermDebtType

us-gaap:LetterOfCredit

Period End	2020-09-30	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	171	174	174	175	175
Percentage of DebtInstrumentUnusedBorrowingCapacityAmount	0.0	0.0	0.0	0.0	0.0

us-gaap:DebtWeightedAverageInterestRate

Period End	2020-09-30	2017-12-31
Value	5.3	0.0507
Percentage of DebtWeightedAverageInterestRate	100.0	100.0

us-gaap:DebtWeightedAverageInterestRate us-gaap:LongtermDebtType

tnc:DebtIncludingRelatedCrosscurrencySwapInstrument

Period End	2021-06-30	2021-03-31	2020-12-31
Value	3.6	5.5	5.5
Percentage of DebtWeightedAverageInterestRate	0.0	0.0	0.0

us-gaap:DeferredCompensationLiabilityCurrentAndNoncurrent

Period End	2020-12-31	2019-12-31
Value	300000.0	200000.0
Percentage of DeferredCompensationLiabilityCurrentAndNoncurrent	100.0	100.0

us-gaap:DeferredFinanceCostsNet

Period End	2021-03-31	2020-12-31	2019-12-31
Value	3000000.0	3100000.0	3800000.0
Percentage of DeferredFinanceCostsNet	100.0	100.0	100.0

us-gaap:DeferredIncomeTaxLiabilities

Period End	2020-12-31	2019-12-31
Value	66	65
Percentage of DeferredIncomeTaxLiabilities	100.0	100.0

us-gaap:DeferredIncomeTaxesAndOtherAssetsNoncurrent

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
Value	22	25	22	25	27	29	27	29	27	31
Percentage of DeferredIncomeTaxesAndOtherAssetsNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredRevenue

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31
Value	10	10	10	10	9.9	9.9	10	8.525	8.204	8.225	8.8	7.787
Percentage of DeferredRevenue	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredRevenueCurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31
Value	6700000.0	6900000.0	6900000.0	6800000.0	6200000.0	6100000.0	6700000.0	5021000.0	5064000.0	4896000.0	5815000.0	2366000.0	2512000.0	2368000.0	2303000.0	1878000.0	3159000.0	2740000.0
Percentage of DeferredRevenueCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredRevenueNoncurrent

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2017-12-31
Value	3500000.0	3500000.0	3900000.0	3900000.0	3700000.0	3800000.0	3900000.0	3504000.0	3140000.0	3329000.0	2483000.0
Percentage of DeferredRevenueNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsGross

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31
Value	50	47	36	37	31	28	30	34	38	41
Percentage of DeferredTaxAssetsGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsInventory

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	4500000.0	4600000.0	3335000.0	4757000.0	332000.0	0	0	28000.0	426000.0	1081000.0	867000.0
Percentage of DeferredTaxAssetsInventory	100.0	100.0	100.0	100.0	100.0	0.0	0.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	9.6	6.6	7.765	11	7.821	5.834	6.845	8.696	6.619	5.915	12	12
Percentage of DeferredTaxAssetsOperatingLossCarryforwards	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsOther

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	2500000.0	3200000.0	4712000.0	3630000.0	2126000.0	603000.0	1246000.0	2523000.0	2329000.0	1777000.0	1937000.0	1177000.0
Percentage of DeferredTaxAssetsOther	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	3.6	3.2	4.708	1.575	1.228	1.102	1.043	4.078	6.72	8.554	10	2.385
Percentage of DeferredTaxAssetsTaxCreditCarryforwards	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:DomesticCountry

Period End	2020-12-31
Value	2.2
Percentage of DeferredTaxAssetsTaxCreditCarryforwards	61.1

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName

us-gaap:DeferredTaxAssetsTaxCreditCarryforwardsForeign

us-gaap:ForeignCountry, us-gaap:TaxAndCustomsAdministrationNetherlands

Period End	2020-12-31
Value	1400000.0
Percentage of DeferredTaxAssetsTaxCreditCarryforwardsForeign	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	14	13	11	11	14	16	16	14	18	20	17	16
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	2300000.0	1900000.0	1728000.0	2138000.0	1413000.0	1446000.0	1549000.0	1593000.0	1540000.0	1464000.0	1252000.0	1396000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	2300000.0	2500000.0	2610000.0	2578000.0	3617000.0	3101000.0	2895000.0	2803000.0	2641000.0	2625000.0	2175000.0	1803000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilitiesGoodwillAndIntangibleAssets

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	41	43	45	60	4.18	3.315	5.611	6.253	6.818	7.093	8.39	9.086
Percentage of DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DeferredTaxLiabilitiesLeasingArrangements

Period End	2020-12-31	2019-12-31
Value	11	11
Percentage of DeferredTaxLiabilitiesLeasingArrangements	100.0	100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31	2011-12-31	2010-12-31	2009-12-31
Value	14	10	9.882	9.042	6.947	6.619	6.745	7.446	7.945	9.167	8.562	8.592
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanName, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation

tnc:GermanPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	1.2	1.0	0.95	1.013	0.871
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation	100.0	100.0	100.0	100.0	100.0

tnc:ItalianPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31
Value	4.2	4.3
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation	350.0	430.0

tnc:UKPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	12	10	9.264	11	10
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation	1016.7	1040.0	975.2	1098.8	1178.5

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31	2019-12-31
Value	1.2	1.3
Percentage of DefinedBenefitPlanAccumulatedBenefitObligation	100.0	130.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	-2.2	-0.5	-0.067	-1.245	-1.802
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	100.0	100.0	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	0.8	0.4	0.444	-0.041	-0.566
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	-36.4	-80.0	-662.7	3.3	31.4

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	2000000.0	400000.0	-42000.0	1245000.0	1802000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	100.0	100.0	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	-800000.0	-400000.0	-444000.0	41000.0	566000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	-40.0	-100.0	1057.1	3.3	31.4

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31
Value	-200000.0	-100000.0	-100000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31	2019-12-31
Value	-1200000.0	-1300000.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet	100.0	100.0

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	-4300000.0	800000.0	628000.0	-981000.0	-1574000.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet	358.3	-61.5	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanAmountsRecognizedInBalanceSheet us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	-7300000.0	-7800000.0	-8613000.0	-9604000.0	-10540000.0
Percentage of DefinedBenefitPlanAmountsRecognizedInBalanceSheet	608.3	600.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	1.1	1.8	1.578	0.0	0.0
Percentage of DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	100.0	100.0	100.0	0.0	0.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31	2019-12-31
Value	2.06	3.01
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	100.0	100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	1.05	0.0203	0.0272	0.0245	0.0264
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	51.0	0.7	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	2.07	0.0306	0.0395	0.0326	0.0358
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	100.5	1.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanBenefitObligation

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31	2019-12-31	2018-12-31
Value	1.2	1.3	1.3
Percentage of DefinedBenefitPlanBenefitObligation	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	17	11	10	12	11	10
Percentage of DefinedBenefitPlanBenefitObligation	1466.7	876.9	785.7	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanBenefitObligation us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	7.3	7.8	8.613	9.604	10	11
Percentage of DefinedBenefitPlanBenefitObligation	608.3	600.0	662.5	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	0.4
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	4.0	1.6	1.511	1.538
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	1000.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	2.5	2.8	3.424	3.509
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	625.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	200000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	300000.0	200000.0	243000.0	247000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	150.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	700000.0	700000.0	779000.0	771000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	350.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	100000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	800000.0	300000.0	275000.0	278000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	800.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	600000.0	600000.0	715000.0	741000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	600.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	100000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	800000.0	300000.0	265000.0	269000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	800.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	600000.0	700000.0	755000.0	751000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	600.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	100000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	800000.0	300000.0	257000.0	261000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	800.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	600000.0	700000.0	752000.0	849000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	600.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31
Value	100000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	700000.0	300000.0	249000.0	254000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	700.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	600000.0	700000.0	830000.0	803000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	600.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:Range, us-gaap:RetirementPlanName, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

srt:Maximum, tnc:GermanPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31
Value	100000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	100.0

srt:Maximum, tnc:ItalianPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31
Value	100000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanName, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

tnc:UKPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31
Value	400000.0	300000.0	360000.0	292000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	400.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31	2019-12-31
Value	100000.0	200000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear	100.0	0.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

Period End	2020-12-31
Value	0.0
Percentage of DefinedBenefitPlanFairValueOfPlanAssets	0.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanTaxStatus

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

country:US, us-gaap:NonqualifiedPlan

Period End	2020-12-31	2019-12-31
Value	-1200000.0	-1300000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan	100.0	100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	-4300000.0	800000.0	628000.0	-981000.0	-1574000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan	358.3	-61.5	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31
Value	-7300000.0	-7800000.0	-8613000.0	-9604000.0	-10540000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan	608.3	600.0	0.0	0.0	0.0

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear us-gaap:StatementScenario, us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear

tnc:Post65, us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31
Value	6.2	6.22
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	100.0	100.0

tnc:Pre65, us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31
Value	5.9	6.22
Percentage of DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	95.2	100.0

us-gaap:DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation

Period End	2020-12-31	2019-12-31	2018-12-31
Value	6600000.0	2300000.0	2200000.0
Percentage of DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31
Value	6.6	2.3	2.217	2.427	12	2.616	13	12	3.261
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1 us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanUltimateHealthCareCostTrendRate1

us-gaap:DefinedBenefitPostretirementHealthCoverage

Period End	2020-12-31	2019-12-31	2018-12-31
Value	4.5	0.05	0.05
Percentage of DefinedBenefitPlanUltimateHealthCareCostTrendRate1	100.0	100.0	100.0

us-gaap:DerivativeAssetsCurrent us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeAssetsCurrent

us-gaap:OtherCurrentAssets, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument

Period End	2021-03-31	2020-12-31	2019-12-31
Value	2200000.0	1900000.0	2500000.0
Percentage of DerivativeAssetsCurrent	100.0	100.0	100.0

us-gaap:OtherCurrentAssets, us-gaap:ForeignExchangeForward, us-gaap:Nondesignated

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	1200000.0	1000000.0	400000.0	600000.0
Percentage of DerivativeAssetsCurrent	0.0	45.5	21.1	24.0

us-gaap:DerivativeAssetsCurrent us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:ForeignExchangeOption, us-gaap:DesignatedAsHedgingInstrument

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	100000.0	100000.0	400000.0	0	100000.0	0	100000.0	200000.0
Percentage of DerivativeAssetsCurrent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ForwardContracts, us-gaap:DesignatedAsHedgingInstrument

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	2200000.0	2600000.0	2600000.0	2500000.0	2700000.0	2400000.0	2400000.0	2300000.0
Percentage of DerivativeAssetsCurrent	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0

us-gaap:ForwardContracts, us-gaap:Nondesignated

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	1400000.0	1400000.0	2400000.0	600000.0	700000.0	600000.0	900000.0	200000.0
Percentage of DerivativeAssetsCurrent	0.0	0.0	0.0	24.0	0.0	0.0	0.0	0.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:OtherCurrentAssets, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument

Period End	2021-06-30
Value	17
Percentage of DerivativeLiabilitiesCurrent	100.0

us-gaap:OtherCurrentLiabilities, us-gaap:ForeignExchangeForward, us-gaap:Nondesignated

Period End	2021-03-31	2020-12-31	2019-12-31
Value	0.1	0.7	0.3
Percentage of DerivativeLiabilitiesCurrent	0.0	0.0	0.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:ForwardContracts, us-gaap:Nondesignated

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31
Value	0.2	0.2	0.1	0.3	0.8	0.6	0.1	0.0
Percentage of DerivativeLiabilitiesCurrent	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:DerivativeLiabilitiesNoncurrent us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:OtherNoncurrentLiabilities, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument

Period End	2021-03-31	2020-12-31
Value	17	24
Percentage of DerivativeLiabilitiesNoncurrent	100.0	100.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilityFairValueGrossAsset

us-gaap:OtherNoncurrentLiabilities, us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument

Period End	2020-12-31	2019-12-31
Value	24	12
Percentage of DerivativeLiabilityFairValueGrossAsset	100.0	100.0

us-gaap:DerivativeLiabilityFairValueGrossAsset us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:ForwardContracts, us-gaap:DesignatedAsHedgingInstrument

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2014-12-31
Value	16	8.7	5.8	12	8.5	16	16	25	29	31	41	34	31	26	0.009	0.013	0.022	0.015	0.035	0.0	0.0
Percentage of DerivativeLiabilityFairValueGrossAsset	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:DerivativeNotionalAmount us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:DerivativeNotionalAmount

us-gaap:CurrencySwap, us-gaap:DesignatedAsHedgingInstrument

Period End	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	156	157	159	161	163	165	166	168	174	159
Percentage of DerivativeNotionalAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:ForeignExchangeForward, us-gaap:DesignatedAsHedgingInstrument

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	2.9	2.8	2.7	3.0
Percentage of DerivativeNotionalAmount	1.9	1.8	1.7	1.8

us-gaap:ForeignExchangeForward, us-gaap:Nondesignated

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	44	50	57	41
Percentage of DerivativeNotionalAmount	28.4	32.1	35.9	25.1

us-gaap:ForeignExchangeOption, us-gaap:DesignatedAsHedgingInstrument

Period End	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	5.9	7.6	8.2	8.2	8.4	8.9	9.8	9.4	8.4
Percentage of DerivativeNotionalAmount	3.8	4.8	5.1	5.1	5.1	5.4	5.9	5.6	4.8

us-gaap:ForwardContracts, us-gaap:DesignatedAsHedgingInstrument

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	2.8	2.4	3.2	3.0	2.8	0.0
Percentage of DerivativeNotionalAmount	1.7	1.5	1.9	1.8	1.7	0.0

us-gaap:ForwardContracts, us-gaap:Nondesignated

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2018-12-31
Value	55	51	46	41	50	63
Percentage of DerivativeNotionalAmount	34.3	31.2	28.1	25.1	29.8	36.4

us-gaap:EmployeeRelatedLiabilitiesCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2010-12-31
Value	61	49	53	50	45	40	63	52	50	41	49	42	41	34	37	35	35	23	35	30	30	26	34	36	28	25	33	33	27	25	29	31	24	24	33	32	24	23	32	31	26	31
Percentage of EmployeeRelatedLiabilitiesCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeRelatedLiabilitiesCurrentAndNoncurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2012-12-31
Value	17	17	17	18	18	18	19	19	20	20	21	21	22	23	23	25	25	20	21	20	21	21	21	24	24	25	25	24	24	24	25	25
Percentage of EmployeeRelatedLiabilitiesCurrentAndNoncurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeStockOption

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31
Value	1000000.0	2100000.0	1944000.0	2064000.0	2103000.0	2187000.0	3221000.0	3102000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:PerformanceShares

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	900000.0	5400000.0	3287000.0	1400000.0	5642000.0	2660000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	90.0	257.1	169.1	67.8	268.3	121.6

us-gaap:RestrictedStock

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31	2014-12-31	2013-12-31	2012-12-31
Value	1200000.0	1100000.0	1196000.0	1585000.0	1679000.0	1568000.0	1671000.0	1993000.0	1718000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	120.0	52.4	61.5	76.8	79.8	71.7	51.9	64.2	0.0

us-gaap:RestrictedStockUnitsRSU

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	2300000.0	3000000.0	4473000.0	1743000.0	723000.0	1078000.0
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	230.0	142.9	230.1	84.4	34.4	49.3

us-gaap:FIFOInventoryAmount

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	107	101	95	96	102	104	100	103	105	104	89	92	89	95	88	97	99	47	43	45	43	45	41	41	44	42	42	43	46	46	44	43	40	42	37	37	43	43	44	41
Percentage of FIFOInventoryAmount	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue us-gaap:RetirementPlanName, us-gaap:RetirementPlanSponsorLocation, us-gaap:RetirementPlanType

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

tnc:UKPensionPlan, us-gaap:ForeignPlan, us-gaap:PensionPlansDefinedBenefit

Period End	2020-12-31	2019-12-31	2018-12-31	2017-12-31	2016-12-31	2015-12-31
Value	13	12	10	11	9.562	10
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeaseLiability

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	100000.0	100000.0	100000.0	200000.0
Percentage of FinanceLeaseLiability	100.0	100.0	100.0	100.0

us-gaap:FinanceLeaseLiabilityCurrent

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2019-12-31	2019-09-30	2019-06-30
Value	100000.0	100000.0	100000.0	100000.0	200000.0	200000.0	200000.0
Percentage of FinanceLeaseLiabilityCurrent	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FinanceLeaseLiabilityPaymentsDue

Period End	2020-12-31
Value	100000.0
Percentage of FinanceLeaseLiabilityPaymentsDue	100.0

us-gaap:FinanceLeaseLiabilityPaymentsDueNextTwelveMonths

Period End	2020-12-31
Value	100000.0
Percentage of FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	100.0

us-gaap:FinanceLeaseRightOfUseAsset

Period End	2020-12-31	2019-12-31
Value	100000.0	300000.0
Percentage of FinanceLeaseRightOfUseAsset	100.0	100.0

us-gaap:FinanceLeaseRightOfUseAssetAccumulatedAmortization

Period End	2020-12-31	2019-12-31
Value	200000.0	500000.0
Percentage of FinanceLeaseRightOfUseAssetAccumulatedAmortization	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	-99.2	-93.2	-92.3	83	75	69	65	58	55	49	44	39	34	30	23	17	12	9.11	8.692	8.917	8.772	8.577	27	16	17	16	17	17	18	17	16	16	14	14	14	13	12	12	13	9.473
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2012-12-31
Value	-75.9	-71.3	-70.3	63	57	52	49	44	42	37	33	29	25	23	17	13	8.697	6.192	5.948	6.148	6.09	5.916	19	11	12	11	12	12	12	12	11	9.907
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	76.5	76.5	76.2	76.0	76.1	76.0	76.3	75.9	75.7	75.9	75.7	75.0	75.5	76.4	75.8	75.9	67.3	68.0	68.4	68.9	69.4	69.0	71.1	67.0	69.1	68.9	68.8	69.2	69.3	68.9	68.6	69.4

us-gaap:TechnologyBasedIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31
Value	-10.3	-9.9	-9.7	9.0	8.2	7.7	7.3	6.8	6.7	5.9	5.5	5.326	4.556	3.915	3.259	2.647	2.982	2.829	2.744	2.769	2.682	2.661	3.95	3.495	3.402	3.218	3.406	3.412	3.524	3.436	3.333
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	10.4	10.6	10.5	10.8	10.9	11.1	11.2	11.6	12.1	12.0	12.3	13.4	13.2	12.8	13.8	14.9	23.1	31.1	31.6	31.1	30.6	31.0	14.6	20.6	19.3	19.5	19.4	19.2	19.1	19.4	19.7

us-gaap:TradeNames

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2011-12-31
Value	-13.0	-12.0	-12.3	11	9.8	8.9	8.2	7.3	6.8	6.0	5.327	4.631	3.894	3.293	2.436	1.631	0.823	0.089	0.0	3.859	2.11	2.048	1.903	2.068	2.074	2.138	2.061	1.976	1.858	1.712	1.608	1.565	1.209
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization	13.1	12.9	13.3	13.2	13.0	12.9	12.6	12.5	12.2	12.2	12.0	11.6	11.3	10.8	10.3	9.2	6.4	1.0	0.0	14.3	12.4	11.6	11.5	11.8	11.7	11.6	11.7	11.7	11.5	11.4	11.1	11.0	8.7

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive

Period End	2020-12-31	2020-09-30
Value	42	53
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

Period End	2021-06-30	2021-03-31	2020-12-31
Value	17	17	20
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear

Period End	2021-06-30	2021-03-31	2020-09-30
Value	9.7	14	5.3
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFive

Period End	2020-12-31	2020-09-30
Value	13	14
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearFour

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	12	12	14	16
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	14	14	16	17
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30
Value	16	15	18	19
Percentage of FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsGross

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2010-12-31
Value	210	207	218	209	201	198	203	197	205	205	191	192	192	202	195	193	179	17	15	11	11	11	30	30	31	30	33	34	36	36	35	35	34	34	35	35	35	36	37	34
Percentage of FiniteLivedIntangibleAssetsGross	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0	100.0

us-gaap:FiniteLivedIntangibleAssetsGross us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:CustomerLists

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2012-12-31
Value	161	159	166	159	153	150	154	149	156	156	143	144	145	154	149	147	136	10	8.016	6.58	6.55	6.439	19	20	21	20	21	22	24	23	23	23
Percentage of FiniteLivedIntangibleAssetsGross	76.6	76.6	76.1	75.9	75.9	75.8	75.9	75.7	75.9	76.1	74.9	75.1	75.7	76.0	76.2	76.3	76.2	60.0	52.9	55.7	55.7	55.1	65.4	65.5	66.7	66.2	66.2	66.5	66.8	66.3	66.1	66.8

us-gaap:TechnologyBasedIntangibleAssets

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31
Value	17	17	17	17	16	16	17	17	17	17	17	17	15	15	14	14	5.247	5.157	5.136	5.224	5.201	5.243	6.596	6.676	6.669	6.562	6.915	7.049	7.323	7.344	7.347
Percentage of FiniteLivedIntangibleAssetsGross	8.4	8.4	8.2	8.3	8.4	8.4	8.4	8.6	8.4	8.3	9.1	8.9	8.1	7.8	7.4	7.5	2.9	28.8	33.9	44.3	44.3	44.9	21.8	21.6	20.9	21.4	20.9	20.5	20.0	20.3	20.4

us-gaap:TradeNames

Period End	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	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	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2011-12-31
Value	31	31	34	33	31	31	31	31	32	31	30	30	31	32	31	31	33	2.0	2.0	3.859	3.97	3.96	3.812	4.3	4.481	4.807	4.831	4.836	4.758	4.597	4.538	4.657	4.583
Percentage of FiniteLivedIntangibleAssetsGross	15.0	15.0	15.7	15.8	15.8	15.8	15.7	15.7	15.7	15.5	16.0	16.0	16.2	16.2	16.3	16.3	19.0	11.2	13.2	12.8	12.9	12.4	12.4	13.0	13.0	13.1	13.4	13.5	13.4	13.4	13.2	13.1	12.2

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure us-gaap:DerivativeInstrumentRisk

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure

us-gaap:ForeignExchangeForward

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	3.0	3.4	3.0	6.4
Percentage of ForeignCurrencyContractAssetFairValueDisclosure	100.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ForeignExchangeForward, us-gaap:FairValueInputsLevel2

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31	2015-09-30
Value	3.0	3.4	3.0	6.4	0.403
Percentage of ForeignCurrencyContractAssetFairValueDisclosure	100.0	100.0	100.0	100.0	0.0

us-gaap:ForeignExchangeOption, us-gaap:FairValueInputsLevel2

Period End	2020-09-30	2020-06-30	2019-03-31	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	0.1	0.1	0.1	0.245	0.113	0.212	0.16	0.086	0.067	0.078	0.098	0.184	0.127	0.103	0.109	0.387	0.23
Percentage of ForeignCurrencyContractAssetFairValueDisclosure	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ForwardContracts, us-gaap:FairValueInputsLevel2

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31
Value	4.9	6.2	8.1	6.4	7.6	7.1	7.8	7.21	7.691	8.017	6.105	7.66	8.885	10	0.005	0.012	0.027	0.014	0.028	0.284
Percentage of ForeignCurrencyContractAssetFairValueDisclosure	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ForeignCurrencyContractAssetFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementFrequency

us-gaap:ForeignExchangeOption, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	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
Value	0.1	0.1	0.3	0.1	0.1	0.245	0.113	0.212	0.16	0.086	0.067	0.078	0.098	0.184	0.127	0.103
Percentage of ForeignCurrencyContractAssetFairValueDisclosure	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ForwardContracts, us-gaap:FairValueMeasurementsRecurring

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30
Value	4.9	6.2	8.1	6.4	7.6	7.1	7.8	7.21	7.691	8.017	6.105	7.66	8.885	10	0.005	0.012	0.027	0.014
Percentage of ForeignCurrencyContractAssetFairValueDisclosure	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure us-gaap:DerivativeInstrumentRisk

us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure

us-gaap:ForeignExchangeForward

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31
Value	18	17	25	16
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure	100.0	100.0	100.0	100.0

us-gaap:ForeignCurrencyContractsLiabilityFairValueDisclosure us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel

us-gaap:ForeignExchangeForward, us-gaap:FairValueInputsLevel2

Period End	2021-06-30	2021-03-31	2020-12-31	2019-12-31	2015-09-30
Value	18	17	25	16	0.132
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure	100.0	100.0	100.0	100.0	0.0

us-gaap:ForwardContracts, us-gaap:FairValueInputsLevel2

Period End	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31
Value	17	11	8.9	16	13	21	20	25	30	31	42	35	33	27	0.529	0.175	0.711	0.704	1.389	0.007
Percentage of ForeignCurrencyContractsLiabilityFairValueDisclosure	0.0	0.0	0.0	100.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0	0.0

TNC

Table of contents

Plots across concepts

Tables

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue

Common Stock Shares Issued

us-gaap:CommonStockSharesIssued

us-gaap:CommonStockSharesIssued

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStock

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax

Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

us-gaap:ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

Cost Of Goods And Services Sold

us-gaap:CostOfGoodsAndServicesSold

us-gaap:CostOfGoodsAndServicesSold

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt

Gross Profit

us-gaap:GrossProfit

us-gaap:GrossProfit

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit

Income Taxes Paid

us-gaap:IncomeTaxesPaid

us-gaap:IncomeTaxesPaid

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss

Nonoperating Income Expense

us-gaap:NonoperatingIncomeExpense

us-gaap:NonoperatingIncomeExpense

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss

Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTax us-gaap:DerivativeInstrumentRisk, us-gaap:StatementEquityComponents

us-gaap:ForeignExchangeForward, us-gaap:AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterest