Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Valuation Allowances and Reserves, Corporate rate remeasurement	$ (0.3)	$ 0.5	$ (0.2)
Summary Pretax Income [Abstract]
U.S.	(1,581.3)	(329.7)	(467.2)
International	(560.3)	(263.6)	(72.2)
Loss before income taxes and equity in net income (loss) of affiliates	(2,141.6)	(593.3)	(539.4)
Valuation Allowance, Deferred Tax Asset, Change in Amount	(10.0)	7.8	18.3
Valuation Allowances and Reserves, Depreciation and Amortization	0.1	0.2	0.2
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities	3.0	0.0	0.0
Valuation Allowances and Reserves, Other	(25.7)	4.6	(3.0)
Valuation Allowances and Reserves, Other comprehensive income adjustment	(1.1)	(1.9)	7.3
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	1,380.5	867.4	714.7	$ 536.8
Valuation Allowances and Reserves, Net operating losses	547.1	141.5	155.3
Deferred Tax Assets, Gross	1,372.8	858.4
Current
Federal	0.1	1.4	(4.5)
State	(11.0)	0.0	(0.7)
Foreign	4.2	2.7	1.7
Total current	(6.7)	4.1	(3.5)
Deferred
Federal	2.0	11.1	10.2
State	(1.5)	3.2	2.5
Foreign	3.8	4.1	(4.0)
Total Deferred	4.3	18.4	8.7
Total income tax provision (benefit)	(2.4)	22.5	5.2
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax at U.S. Federal statutory rate	(449.7)	(124.6)	(113.3)
State income taxes, net of Federal benefit	(51.1)	(6.4)	(9.6)
State income tax credits, net of Federal benefit	(1.4)	(8.6)	(15.6)
Foreign rate differences	(25.5)	(12.1)	(3.5)
Research and experimentation	(4.8)	(4.2)	(5.2)
Valuation Allowance - U.S. Deferred Tax Asset	514.3	154.5	170.6
Other	2.7	15.1	(3.3)
Total income tax provision (benefit)	$ (2.4)	$ 22.5	$ 5.2
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	2.40%	1.10%	1.80%
State income tax credits, net of Federal benefit	0.00%	1.40%	2.90%
Foreign rate differences	1.20%	2.00%	0.60%
Research and experimentation	(0.20%)	(0.70%)	(1.00%)
Valuation Allowance - U.S. Deferred Tax Asset	(24.00%)	(26.00%)	(31.60%)
Other	(0.10%)	(2.50%)	0.60%
Effective Income Tax Rate Reconciliation, Percent	0.10%	(3.80%)	(1.00%)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 2.1	$ (0.3)	$ (10.6)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	(0.10%)	0.10%	2.00%
Effective Income Tax Rate Reconciliation, Excess Tax Benefit	$ 0.0	$ 0.9	$ 0.4
EffectiveTaxRateRecon, ExcessTaxBenefit, Percentage	0.00%	(0.20%)	(0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 10.2	$ 17.2	$ 4.2
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	(0.50%)	(2.90%)	(0.80%)
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Depreciation and amortization	$ (39.0)	$ 125.3
Net operating loss carryforward	36.3	26.9
Deferred Tax Liabilities, Other	(27.5)	(15.9)
Accruals and reserves	(45.4)	(87.7)
Employee compensation accruals	0.6	0.9
Pension and other employee benefit plans	1,084.0	489.7
Deferred Tax Asset, Interest Carryforward	116.4	89.9
Deferred Tax Assets, State Taxes	143.6	154.1
Interest expense limitation	59.3	47.3
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other	7.4	8.9
Deferred Tax Assets, Tax Deferred Expense, Other	37.3	19.7
Net deferred tax asset before valuation allowance	1,372.8	858.4
Deferred Tax Liabilities, Net	7.7	9.0
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	7.1	8.1	$ 18.3
Gross increases (decreases) related to current period tax positions	0.4		0.4
Gross increases related to prior period tax positions	2.3	0.0	0.0
Statute of limitations’ expiration	0.0	(0.6)	(10.6)
Ending Balance	9.8	7.1	8.1
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	8.1
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits	9.8	7.1	8.1	$ 18.3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	8.1
Deferred Tax Assets, Valuation Allowance	1,380.5	867.4
Deferred Tax Assets, Net of Valuation Allowance	0.1	0.1
Deferred Tax Liabilities, Gross	7.8	9.1
Net non-current deferred tax asset (liability)	(7.7)	(9.0)
Deferred Tax Assets, Valuation Allowance	1,380.5	867.4
U.S. Deferred Tax Assets, Net of Valuation Allowance	0.1
Effective Income Tax Rate Reconciliation, Re-measurement of Deferred Taxes, Amount	$ 0.8	$ (9.0)	$ (7.1)
Effective Income Tax Rate Reconciliation, Re-measurement of Deferred Taxes, Percent	0.00%	1.50%	1.30%
Effective Income Tax Rate Reconciliation, GILTI, Percent	0.00%	0.00%	0.30%
Effective Income Tax Rate Reconciliation, GILTI, Amount	$ 0.0	$ 0.0	$ (1.8)
Deferred Tax Liabilities Interest Swap Contracts	(0.2)	$ (0.7)
Foreign Tax Jurisdiction [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Deferred Tax Assets, Valuation Allowance	504.0
Deferred Tax Assets, Valuation Allowance	504.0
Domestic Tax Jurisdiction [Member]
Summary Pretax Income [Abstract]
Deferred Tax Assets, Gross	876.5
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Net deferred tax asset before valuation allowance	876.5
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Deferred Tax Assets, Valuation Allowance	876.6
Deferred Tax Assets, Valuation Allowance	$ 876.6