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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Sep. 30, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Q3 - Q4 2019 $ 7.4
2020 27.1
2021 22.1
2022 15.2
2023 12.8
2024 $ 12.3