Financial Instruments and Hedging Activities (Fair Values of Derivative Instruments Included on Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 256.0	$ 227.0
Liability Derivatives Fair Value	45.3	97.5
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	61.6	41.4
Liability Derivatives Fair Value	34.1	79.5
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	194.4	185.6
Liability Derivatives Fair Value	11.2	18.0
Interest Rate Contract [Member] | Accrued Expenses And Other Current Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value
Interest Rate Contract [Member] | Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	5.7
Interest Rate Contract [Member] | Other Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value
Interest Rate Contract [Member] | Other Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	21.2	35.8
Equity [Member] | Accrued Expenses And Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	4.1	8.6
Equity [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	194.4	185.6
Equity [Member] | Other Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value
Foreign Exchange [Member] | Accrued Expenses And Other Current Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	32.9	64.5
Foreign Exchange [Member] | Accrued Expenses And Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	7.1	9.4
Foreign Exchange [Member] | Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	11.7
Foreign Exchange [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value
Foreign Exchange [Member] | Other Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	1.2	15.0
Foreign Exchange [Member] | Other Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 23.0	$ 5.6