Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Reclassified from Accumulated Other Comprehensive Loss into Income Effective Portion (Detail)

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Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Reclassified from Accumulated Other Comprehensive Loss into Income Effective Portion (Detail) - Foreign exchange currency contracts relating to inventory and intercompany management fee hedges [Member] - Derivatives designated as hedging instruments [Member] - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cost of sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss to Income $ 1.2 $ (1.3) $ 3.2 $ 0.3
Selling, general and administrative expenses [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss to Income $ (0.4) $ (1.5) $ (4.4) $ (0.6)