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(Financial Instruments and Hedging Activities - Additional Information) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Cumulative deferred hedging gain (loss), after tax, included in accumulated other comprehensive income	$ 12.0
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, notional amount	731.5
Intercompany Debt [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Foreign currency denominated debt designated to hedge investments in certain foreign subsidiaries and affiliates	4,200.0
Debt [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Foreign currency denominated debt designated to hedge investments in certain foreign subsidiaries and affiliates	12,400.0
Interest Rate Risk [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative instruments, gain (loss) recognized in income, net	12.3
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	$ (18.5)
Royalty Arrangement [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Period covered by hedge	18 months
Derivative, notional amount	$ 782.1

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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