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Other Intangible Assets, Net (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]    
Original amount $ 80.9 $ 79.0
Accumulated amortization 42.4 36.2
Other intangible assets, net $ 38.5 $ 42.8
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 8 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 20 years  
Core Technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets   8 years
Original amount $ 55.4 $ 53.5
Accumulated amortization 20.0 15.4
Other intangible assets, net 35.4 38.1
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Original amount 25.5 25.5
Accumulated amortization 22.4 20.8
Other intangible assets, net $ 3.1 $ 4.7
Trademarks and trade names | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 15 months  
Trademarks and trade names | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 20 months