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, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (54.4)	$ (50.9)
Notional amount	1,956.2	1,818.0
Designated as hedging instrument | Cash flow hedging
Derivatives, Fair Value [Line Items]
Other current assets	11.2	8.2
Other long-term assets	0.5	0.3
Other current liabilities	(58.3)	(51.5)
Other long-term liabilities	(9.9)	(3.4)
Derivative, fair value, net	(56.5)	(46.4)
Notional amount	$ 1,275.0	$ 1,394.6
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	$ 5.9	$ 3.6
Other current liabilities	(3.8)	(8.1)
Derivative, fair value, net	2.1	(4.5)
Notional amount	$ 681.2	$ 423.4
Not designated as hedging instrument | Maximum
Derivatives, Fair Value [Line Items]
Outstanding maturities in months, not to exceed	12 months	12 months