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Goodwill and Intangible Assets - Estimated Future Amortization of Other Intangible Assets (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Finite Lived Intangible Assets Future Amortization Expense [Abstract]  
2021 $ 6.2
2022 5.8
2023 5.0
2024 4.3
2025 $ 1.8