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Fair Value Measurements - Offsetting of Derivative Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities $ 21.4 $ 5.1
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (10.4) (3.0)
Net Amounts of Liabilities Presented in the Balance Sheet 11.0 2.1
Foreign exchange currency contracts [Member]
   
Derivative [Line Items]    
Gross Amounts of Recognized Liabilities 21.4 5.1
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities (10.4) (3.0)
Net Amounts of Liabilities Presented in the Balance Sheet $ 11.0 $ 2.1