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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value Measurements [Line Items]
Maturity period limit of foreign currency exchange instruments (in months)	3 months
Net fair value gain (loss) on foreign exchange forward contracts	$ (17.3)	$ 0.6
Difference between carrying amount and fair value of long-term debt	4.0		$ 3.0
Other Income (Expense), Net
Fair Value Measurements [Line Items]
Gain (loss) on foreign exchange forward contracts	(14.1)	22.8
Prepaid Expenses and Other Current Assets
Fair Value Measurements [Line Items]
Net fair value gain (loss) on foreign exchange forward contracts	1.9	1.3
Other Accrued Liabilities
Fair Value Measurements [Line Items]
Net fair value gain (loss) on foreign exchange forward contracts	19.2	0.7
Foreign Exchange Contract
Fair Value Measurements [Line Items]
Notional amount of foreign exchange forward contracts not designated as hedging instruments	$ 473.8	$ 408.4

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Foreign Currency Derivatives Increase Decrease In Fair Value

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Nominal or face amount used to calculate payments on the derivative asset.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

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Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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