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Goodwill and Other Intangible Assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]    
2021 $ 14.1  
2022 12.9  
2023 12.5  
2024 12.3  
2025 12.2  
Thereafter 408.0  
Net Balance $ 472.0 $ 458.5