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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative assets - current	$ 7.7	$ 12.5
Derivative assets - non current	2.7	1.0
Derivative liabilities - current	1.6	11.8
Derivative liabilities - non current	1.3	5.7
Foreign Exchange Contracts [Member] | Call Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	141.0	78.3
Foreign Exchange Contracts [Member] | Put Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	141.0	78.3
Foreign Exchange Contracts [Member] | Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	13.3	61.6
Foreign Exchange Contracts [Member] | Forward Contracts [Member] | Call Options [Member]
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts	$ 31.0	$ 57.5

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