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Gains and Losses on Derivatives Designated as Hedging Instruments, Net Investment Hedging (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) $ 0 $ 0
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
   
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain/(Loss) Recognized in AOCI on Derivative (Effective Portion) (2.1) 0.8
Net Investment Hedging [Member] | N/A
   
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain/(Loss) Reclassified from AOCI into Income (Effective Portion) 0 0
Gain/(Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 0 $ 0