Financial Instruments - Fair Values of Derivative Instruments in Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 12.0	$ 25.5
Liability derivatives	0.7	1.9
Derivatives designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset derivatives	10.1	0.0
Liability derivatives	0.0	1.0
Derivatives designated as hedging instruments | Other current assets | Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	10.1	0.0
Derivatives designated as hedging instruments | Other accrued & current liabilities | Interest rate contracts
Derivatives, Fair Value [Line Items]
Liability derivatives	0.0	1.0
Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Asset derivatives	1.9	25.5
Liability derivatives	0.7	0.9
Derivatives not designated as hedging instruments | Other current assets | Foreign exchange collar
Derivatives, Fair Value [Line Items]
Asset derivatives	0.0	23.5
Derivatives not designated as hedging instruments | Other current assets | Foreign exchange forward contracts
Derivatives, Fair Value [Line Items]
Asset derivatives	1.9	2.0
Derivatives not designated as hedging instruments | Other accrued & current liabilities | Foreign exchange collar
Derivatives, Fair Value [Line Items]
Liability derivatives	0.0	0.0
Derivatives not designated as hedging instruments | Other accrued & current liabilities | Foreign exchange forward contracts
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 0.7	$ 0.9