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Commitments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Commitment And Contingencies [Line Items]      
Purchase obligations $ 397.3    
Purchase obligations due in one year 371.3    
Operating leases, rent expense net $ 42.1 $ 43.5 $ 34.9