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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Jun. 30, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Q3 - Q4 2020 $ 13.2
2021 22.6
2022 15.7
2023 13.1
2024 12.6
2025 $ 12.6