Financial Instruments (Effect of Risk-Management Instruments) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Cash flow hedges:
Total	$ 188.8	$ (92.4)	$ 195.1	$ 116.2
Foreign currency-denominated notes
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), net investment hedges	333.3	(57.8)	387.7	149.9
Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), net investment hedges	68.5	(46.5)	79.3	104.1
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), cash flow hedges	1.4	(6.9)	18.5	19.4
Foreign currency exchange contracts
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), net investment hedges	13.6	0.0	13.6	0.0
Forward-starting interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), cash flow hedges	157.7	(165.2)	280.2	129.9
Designated as Hedging Instrument \| Foreign currency-denominated notes
Fair value hedges:
Effect from hedged fixed-rate debt	(58.2)	31.1	(152.8)	(50.4)
Designated as Hedging Instrument \| Interest Rate Contracts
Fair value hedges:
Effect from interest rate contracts	58.2	(31.1)	152.8	50.4
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	4.1	4.2	8.2	8.3
Designated as Hedging Instrument \| Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	33.6	(23.4)	41.9	48.1
Not Designated as Hedging Instrument \| Foreign currency exchange contracts
Cash flow hedges:
Net (gains) losses on foreign currency exchange contracts not designated as hedging instruments	$ 151.1	$ (73.2)	$ 145.0	$ 59.8

Cash Flow Hedge [Abstract]

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Derivative Instruments, Gain (Loss) Recognized

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Fair Value Hedge [Abstract]

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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