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Goodwill and Other Intangible Assets - Schedule of Estimated Annual Amortization Expense Related to Other Intangible Assets (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2021 $ 18.9
2022 18.8
2023 18.8
2024 2.9
2025 1.3
2026 and thereafter 8.1
Total $ 68.8