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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
2020 $ 13.2  
2021 12.5  
2022 11.1  
2023 10.6  
2024 10.6  
Thereafter 400.5  
Net Balance $ 458.5 $ 471.6