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Financial Instruments (Effect of Risk-Management Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Cash flow hedges:
Total	$ (92.4)	$ (30.3)	$ 116.2	$ (44.9)
Foreign currency-denominated notes
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), net investment hedges	(57.8)	(72.4)	149.9	(5.0)
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	(46.5)	(60.8)	104.1	55.0
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss), cash flow hedges	(6.9)	4.9	19.4	(64.9)
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	(165.2)	38.2	129.9	(331.6)
Designated as Hedging Instrument | Foreign currency-denominated notes
Fair value hedges:
Effect from hedged fixed-rate debt	31.1	7.0	(50.4)	124.4
Designated as Hedging Instrument | Interest rate contracts
Fair value hedges:
Effect from interest rate contracts	(31.1)	(7.0)	50.4	(124.4)
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	4.2	4.1	8.3	8.1
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	(23.4)	(11.5)	48.1	(24.4)
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	$ (73.2)	$ (22.9)	$ 59.8	$ (28.6)

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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 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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