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Fair Value Measurements and Related Valuation Techniques and Fair Value Hierarchy Level (Detail) (Fair Value, Measurements, Recurring, Foreign Exchange Contract, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets, at fair value $ 6.4 $ 19.9
Fair Value, Inputs, Level 1
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets, at fair value      
Fair Value, Inputs, Level 2
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets, at fair value 6.4 19.9
Fair Value, Inputs, Level 3
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Derivative assets, at fair value