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Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Interest rate swap contract
Mar. 31, 2013
Fair Value, Measurements, Recurring
Fair Value, Inputs, Level 3
Dec. 31, 2012
Fair Value, Measurements, Recurring
Fair Value, Inputs, Level 3
Derivative [Line Items]          
Notional value of forward currency and option contracts $ 147.3 $ 128.1      
Fixed-rate notes interest percentage     2.875%    
Fixed-rate notes due date     2016    
Notional value of interest rate swap contract     250.0    
Fair value of contingent consideration       79.1 77.1
Fair value of long-term debt $ 1,511.7 $ 1,532.2