Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Recorded to Income (Detail)

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Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Recorded to Income (Detail) - Selling, general and administrative expenses [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Foreign exchange currency contracts relating to inventory and intercompany management fee hedges [Member] | Derivatives designated as hedging instruments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income $ (0.1) $ 0.2 $ 0.4
Foreign exchange currency contracts [Member] | Derivatives not designated as hedging instruments [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Recognized in Income $ (8.6) $ (4.3) $ (4.1)