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Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Fair Value of Asset Derivatives $ 5.3 $ 5.4
Fair Value of (Liability) Derivatives (35.1) (30.4)
Foreign currency forward contracts | Designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Fair Value of Asset Derivatives 1.9 0.5
Fair Value of (Liability) Derivatives (2.0) (0.8)
Foreign currency forward contracts | Not designated as hedging instruments
   
Derivatives, Fair Value [Line Items]    
Fair Value of Asset Derivatives 3.4 4.9
Fair Value of (Liability) Derivatives $ (33.1) $ (29.6)