Financial Instruments - Effects of Derivative Financial Instruments on Income and Other Comprehensive Income (Loss) (Detail) (Not Designated as Hedging Instrument [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Foreign Currency Gain (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Foreign Currency (Gains) Losses, Net/Reclassified from OCI to Income (Ineffective Portion)	$ (1.9)		$ (1.1)		$ (3.1)
Foreign Currency Gain (Loss) [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Foreign Currency (Gains) Losses, Net/Reclassified from OCI to Income (Ineffective Portion)	(1.9)		(1.1)		(3.1)
Foreign Currency Gain (Loss) [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Foreign Currency (Gains) Losses, Net/Reclassified from OCI to Income (Ineffective Portion)		[1]		[1]		[1]
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Foreign Currency (Gains) Losses, Net/Reclassified from OCI to Income (Ineffective Portion)					(0.8)
Interest Expense [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Foreign Currency (Gains) Losses, Net/Reclassified from OCI to Income (Ineffective Portion)		[1]		[1]	$ (0.8)	[1]

[1] Effective March 11, 2010 (the closing date of the 2010 refinancing of the 2006 bank term loan facility), the 2008 Interest Rate Swap, which expired in April 2010, was no longer designated as a cash flow hedge. (See "Interest Rate Swap" in this Note 12).