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Derivatives and Hedging Activity - Summary of Notional and Fair Values of Derivative Instruments (Parenthetical) (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Derivative assets - current | $ 12.3 | $ 7.7
Derivative assets - non current | 3.5 | 2.7
Derivative liabilities - current | 0.7 | 1.6
Derivative liabilities - non current | 1.3 | 1.3
Foreign Exchange Contracts [Member] | Call Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | 128.3 | 141.0
Foreign Exchange Contracts [Member] | Put Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | 128.3 | 141.0
Foreign Exchange Contracts [Member] | Forward Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts | $ 26.7 | 13.3
Foreign Exchange Contracts [Member] | Forward Contracts [Member] | Call Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange derivative contracts |  | $ 31.0

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