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Pre-Tax Gains Related to Derivatives Not Designated as Hedges (Detail) (Not Designated as Hedging Instrument, Selling, General and Administrative Expenses, Foreign Exchange Contract, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Not Designated as Hedging Instrument | Selling, General and Administrative Expenses | Foreign Exchange Contract
   
Derivative Instruments Gain Loss [Line Items]    
Total (gain) loss recognized in the consolidated statements of operations $ (12.8) $ (0.7)