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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquisition-related contingent consideration $ 5.6  
Level 2
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instruments, Assets 7.4 6.0
Derivative financial instruments, Liabilities 4.6 3.0
Level 3
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Acquisition-related contingent consideration $ 5.6 $ 17.8