Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired	$ 0.0	$ 0.0	$ 13.6
Valuation Allowances and Reserves, Corporate rate remeasurement	0.5	(0.2)	63.0
Summary Pretax Income [Abstract]
U.S.	(329.7)	(467.2)	(553.3)
International	(263.6)	(72.2)	(1.9)
Loss before income taxes and equity in net loss of affiliates	(593.3)	(539.4)	(555.2)
Valuation Allowance, Deferred Tax Asset, Change in Amount	7.8	18.3	6.8
Valuation Allowances and Reserves, Depreciation and Amortization	0.2	0.2	0.2
Valuation Allowances and Reserves, Other	4.6	(3.0)	(1.3)
Valuation Allowances and Reserves, Other comprehensive income adjustment	(1.9)	7.3	(21.8)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	867.4	714.7	536.8	$ 340.9
Valuation Allowances and Reserves, Net operating losses	141.5	155.3	135.4
Deferred Tax Assets, Gross	858.4	718.2
Current
Federal	1.4	(4.5)	(11.4)
State	0.0	(0.7)	(0.2)
Foreign	2.7	1.7	0.9
Total current	4.1	(3.5)	(10.7)
Deferred
Federal	11.1	10.2	(14.0)
State	3.2	2.5	15.9
Foreign	4.1	(4.0)	(8.4)
Total Deferred	18.4	8.7	(6.5)
Total income tax provision (benefit)	22.5	5.2	(17.2)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax at U.S. Federal statutory rate	(124.6)	(113.3)	(116.5)
State income taxes, net of Federal benefit	(6.4)	(9.6)	(24.9)
State income tax credits, net of Federal benefit	(8.6)	(15.6)	(7.4)
Foreign rate differences	(12.1)	(3.5)	(5.2)
Research and experimentation	(4.2)	(5.2)	(1.6)
Valuation Allowance - U.S. Deferred Tax Asset	$ 154.5	$ 170.6	$ 204.2
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	0.00%	1.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0.0	$ 0.0	$ (5.3)
Other	15.1	(3.3)	(5.3)
Total income tax provision (benefit)	$ 22.5	$ 5.2	$ (17.2)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at U.S. Federal statutory rate	21.00%	21.00%	21.00%
State income taxes, net of Federal benefit	1.10%	1.80%	4.50%
State income tax credits, net of Federal benefit	1.40%	2.90%	1.30%
Foreign rate differences	2.00%	0.60%	0.90%
Research and experimentation	(0.70%)	(1.00%)	(0.30%)
Valuation Allowance - U.S. Deferred Tax Asset	(26.00%)	(31.60%)	(36.90%)
Other	(2.50%)	0.60%	1.00%
Effective Income Tax Rate Reconciliation, Percent	(3.80%)	(1.00%)	3.10%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ (0.3)	$ (10.6)	$ 0.0
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.10%	2.00%	0.00%
Effective Income Tax Rate Reconciliation, Excess Tax Benefit	$ 0.9	$ 0.4	$ 0.8
EffectiveTaxRateRecon, ExcessTaxBenefit, Percentage	(0.20%)	(0.10%)	(0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 17.2	$ 4.2	$ 1.9
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	(2.90%)	(0.80%)	(0.30%)
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Depreciation and amortization	$ 125.3	$ 113.3
Net operating loss carryforward	26.9	21.1
Deferred Tax Liabilities, Other	(15.9)	(32.8)
Accruals and reserves	(87.7)	(116.6)
Employee compensation accruals	0.9	0.5
Pension and other employee benefit plans	489.7	438.1
Deferred Tax Asset, Interest Carryforward	89.9	76.3
Deferred Tax Assets, State Taxes	154.1	145.2
Interest expense limitation	47.3	46.2
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other	8.9	7.9
Deferred Tax Assets, Tax Deferred Expense, Other	19.7	18.4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax		0.6
Net deferred tax asset before valuation allowance	858.4	718.2
Deferred Tax Liabilities, Net	9.0
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	8.1	18.3	$ 16.5
Gross increases (decreases) related to current period tax positions		0.4	0.4
Statute of limitations' expiration	(0.6)	(10.6)	(0.6)
Ending Balance	7.1	8.1	18.3
Unrecognized Tax Benefits, Increase Resulting from remeasurement for tax rate change	0.0	0.0	2.0
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	(0.4)
Tax Credit Carryforward [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6.0
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	7.1	8.1	18.3	$ 16.5
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	6.0
Deferred Tax Assets, Valuation Allowance	867.4	714.7
Deferred Tax Assets, Net		3.5
Deferred Tax Assets, Net of Valuation Allowance	0.1	4.8
Deferred Tax Liabilities, Gross	9.1	1.3
Net non-current deferred tax asset (liability)	(9.0)	3.5
Deferred Tax Assets, Valuation Allowance	867.4	714.7
U.S. Deferred Tax Assets, Net of Valuation Allowance	2.6
Effective Income Tax Rate Reconciliation, Re-measurement of Deferred Taxes, Amount	$ (9.0)	$ (7.1)	$ (58.8)
Effective Income Tax Rate Reconciliation, Re-measurement of Deferred Taxes, Percent	1.50%	1.30%	10.60%
Effective Income Tax Rate Reconciliation, GILTI, Percent	0.00%	0.30%	(0.20%)
Effective Income Tax Rate Reconciliation, GILTI, Amount	$ 0.0	$ (1.8)	$ 0.9
Deferred Tax Liabilities Interest Swap Contracts	(0.7)
Foreign Tax Authority [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Deferred Tax Assets, Valuation Allowance	359.2
Deferred Tax Assets, Valuation Allowance	359.2
Domestic Tax Authority [Member]
Summary Pretax Income [Abstract]
Deferred Tax Assets, Gross	505.4
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Net deferred tax asset before valuation allowance	505.4
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Deferred Tax Assets, Valuation Allowance	508.0
Deferred Tax Assets, Valuation Allowance	$ 508.0