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Goodwill and Intangible Assets - Estimated Net Amortization Expense (Detail)
$ in Millions
Sep. 30, 2020
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2020 (remaining) $ 13.2
2021 47.9
2022 45.4
2023 45.0
2024 44.1
2025 43.2
Thereafter $ 228.6