Fair Value of Foreign Exchange Contracts Not Designated and Designated as Hedges (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Not Designated as Hedging Instrument | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	$ 0.6	$ 0.3
Not Designated as Hedging Instrument | Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivatives liabilities	24.0	0.3
Designated as Hedging Instrument | Other Noncurrent Assets
Derivatives, Fair Value [Line Items]
Derivatives assets	$ 14.7	$ 19.9