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Financial Instruments - Fair Value of Outstanding Foreign Currency Derivative Contracts and Related Classification in Condensed Consolidated Balance Sheets (Detail) - Foreign exchange contract - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (22.8)	$ (54.4)
Notional amount	2,219.6	1,956.2
Designated as hedging instrument | Cash flow hedging
Derivatives, Fair Value [Line Items]
Other current assets	16.9	11.2
Other long-term assets	1.3	0.5
Other current liabilities	(28.4)	(58.3)
Other long-term liabilities	(8.0)	(9.9)
Derivative, fair value, net	(18.2)	(56.5)
Notional amount	$ 1,538.5	$ 1,275.0
Designated as hedging instrument | Cash flow hedging | Maximum
Derivatives, Fair Value [Line Items]
Outstanding maturities in months, not to exceed	24 months	24 months
Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Other current assets	$ 1.8	$ 5.9
Other current liabilities	(6.4)	(3.8)
Derivative, fair value, net	(4.6)	2.1
Notional amount	$ 681.1	$ 681.2
Not designated as hedging instrument | Maximum
Derivatives, Fair Value [Line Items]
Outstanding maturities in months, not to exceed	12 months	12 months

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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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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