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Gains and Losses on Derivatives Designated as Hedging Instruments, Net Investment Hedging (Detail) (Net Investment Hedging [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) $ 0.8 $ 0
Foreign Exchange Contract [Member]
   
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) $ 0.8 $ 0