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Commitments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitment And Contingencies [Line Items]      
Purchase obligations $ 332.9    
Purchase obligations due in one year 311.8    
Operating leases, rent expense net $ 34.9 $ 33.4 $ 29.0