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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2021 $ 48.2
2022 45.6
2023 45.2
2024 44.3
2025 43.3
Thereafter $ 229.7