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Estimated Future Amortization Expense of Other Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2020 $ 8.0  
2021 8.0  
2022 6.9  
2023 5.2  
2024 4.9  
Thereafter 9.8  
Other intangible assets, net $ 42.8 $ 41.0