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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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