Financial Instruments and Risk Management (Derivatives Not Designated as Hedging Instruments Fair Values of Derivative Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 106.2	$ 134.7
Liability Derivatives	124.6	187.0
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	88.7	104.3
Liability Derivatives	88.8	160.6
Not designated as hedging instrument | Prepaid expenses & other current assets | Foreign currency option and forward contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	88.7	104.3
Not designated as hedging instrument | Other current liabilities | Foreign currency option and forward contracts
Derivatives, Fair Value [Line Items]
Liability Derivatives	88.8	160.6
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	17.5	30.4
Liability Derivatives	35.8	26.4
Designated as hedging instrument | Prepaid expenses & other current assets | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	17.5	30.4
Designated as hedging instrument | Other current liabilities | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 35.8	$ 26.4