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Financial Instruments (Effect of Risk-Management Instruments) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flow hedges:
Total	$ 52.7	$ 20.3
Designated as Hedging Instrument | Foreign currency-denominated notes
Fair value hedges:
Effect from hedged fixed-rate debt	39.3	(54.8)
Designated as Hedging Instrument | Interest rate contracts
Fair value hedges:
Effect from interest rate contracts	(39.3)	54.8
Cash flow hedges:
Effective portion of losses on interest rate contracts reclassified from accumulated other comprehensive loss	3.8	3.6
Not Designated as Hedging Instrument | Foreign currency exchange contracts
Cash flow hedges:
Net losses on foreign currency exchange contracts not designated as hedging instruments	48.9	16.7
Net investment hedges | Foreign currency-denominated notes
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	53.7	(107.7)
Net investment hedges | Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	38.3	(31.5)
Cash flow hedges | Cross-currency interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	(30.0)	0.0
Cash flow hedges | Forward-starting interest rate swaps
Cash flow hedges:
Effective portion of risk-management instruments that was recognized in other comprehensive income (loss)	$ (11.7)	$ 0.0

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Derivative Instruments, Gain(loss) Recognized

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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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The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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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 of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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