Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax [Line Items]
Total net deferred income tax assets	$ 676.0	$ 941.0
Deferred tax assets, intangibles transferred			$ 264.0
Deferred income tax assets
Employee pensions and other benefits	656.0	667.0
Other balance sheet reserves and allowances	202.0	229.0
Tax loss and credit carryforwards	233.0	272.0
Capitalized research and development	39.0	44.0
Deferred Tax Assets, Lease Liabilities	101.0	91.0
Deferred Tax Assets, Goodwill and Intangible Assets	0.0	123.0
Property, plant and equipment	18.0	11.0
Other	27.0	13.0
Total deferred income tax assets	1,276.0	1,450.0
Valuation allowance	(368.0)	(341.0)
Net deferred income tax assets	908.0	1,109.0
Deferred Tax Liabilities, Intangible Assets	73.0	0.0
Deferred income tax liabilities
Deferred Tax Liabilities, Deferred Expense, Taxable Distribution	101.0	90.0
Capitalized software	58.0	78.0
Total deferred income tax liabilities	232.0	168.0
U.S. federal and foreign tax attribute carryforwards	1,700.0
Effective Income Tax Rate Reconciliation, Change in Foreign Deferred Tax Assets Valuation Allowance, Amount			(74.0)
Effective Income Tax Rate Reconciliation, Change in U.S. Deferred Tax Assets Valuation Allowance, Amount		48.0
Income tax expense (benefit)	186.0	$ (53.0)	$ (273.0)
Valuation allowance against interest expense deduction carryforwards	36.0
Deferred tax impact of tax law change	14.0
Internal entity restructuring expense	40.0
Error correction, utilization of foreign tax credits
Deferred income tax liabilities
Income tax expense (benefit)	9.0
Error correction, utilization of foreign tax credits; multiple periods
Deferred income tax liabilities
Income tax expense (benefit)	4.7
United States [Member]
Deferred income tax liabilities
Tax credit carryforward, amount	$ 233.0