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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Purchase Commitment, Excluding Long-term Commitment      
Aggregate purchase commitments $ 242.1    
Purchase commitments less than one year 232.5    
Rental expense under lease commitments $ 19.3 $ 20.2 $ 19.1
Warranty period 1 year    
Product warranty accrual $ 7.9 8.2  
Revenue deferrals related to extended warranties $ 27.4 $ 24.4