Location and Amounts of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedges (Detail) (Cash flow hedges, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in Other Comprehensive Income (Loss)	$ 2.4	$ 2.5	$ 3.5
Gain/(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(0.6)	1.2	1.2
Forward currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in Other Comprehensive Income (Loss)	(4.6)	4.2	4.0
Forward currency contracts | Cost of Goods Sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	1.4	3.0	(1.3)
Option currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in Other Comprehensive Income (Loss)	6.8	(1.7)	(0.5)
Option currency contracts | Cost of Goods Sold
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	(2.0)	(1.8)	2.5
Interest rate swap contract
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Recognized in Other Comprehensive Income (Loss)	0.2	0	0
Interest rate swap contract | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) Reclassified from Accumulated Other Comprehensive Loss into Income	$ 0	$ 0	$ 0