Location and Amount of Gains and Losses Reported in Consolidated Statements of Comprehensive Income (Detail) (Derivatives not designated as hedging instruments under ASC 815, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total	$ (0.4)	$ (0.1)	$ (0.7)
Foreign exchange contracts | Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total		0.1		0.1
Commodity Contract | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/ (Loss) Recognized in Income on Derivatives, Total	$ (0.4)	$ (0.2)	$ (0.7)	$ (0.1)