Quarterly report pursuant to Section 13 or 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
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
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 (Loss) Gain Recognized in Income $ (0.2) $ 1.7 $ (2.2) $ 1.2
Foreign exchange currency contracts [Member] | Derivatives not designated as hedging instruments [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of (Loss) Gain Recognized in Income $ 1.1 $ (5.2) $ (1.6) $ (6.5)