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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Mar. 31, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Q2 - Q4 2020 $ 19.6
2021 22.0
2022 15.4
2023 12.8
2024 12.3
2025 $ 12.3