Financial Instruments and Hedging Activities (Fair Values of Derivative Instruments Included on Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 245.2	$ 224.7
Liability Derivatives Fair Value	44.6	11.3
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	55.0	31.6
Liability Derivatives Fair Value	32.1	6.4
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	190.2	193.1
Liability Derivatives Fair Value	12.5	4.9
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] | 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	37.9	12.1
Equity [Member] | Accrued Expenses And Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	5.6	0.1
Equity [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	190.2	1.6
Equity [Member] | Other Assets [Member] | Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	0.0	179.1
Foreign Exchange [Member] | Accrued Expenses And Other Current Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	25.8	5.2
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	6.9	4.8
Foreign Exchange [Member] | Prepaid Expenses and Other Current Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	2.1	10.0
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	0.0	12.4
Foreign Exchange [Member] | Other Liabilities [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives Fair Value	6.3	1.2
Foreign Exchange [Member] | Other Assets [Member] | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives Fair Value	$ 15.0	$ 9.5