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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Q2 - Q4 2019 $ 23.4
2020 27.5
2021 22.4
2022 15.3
2023 13.0
2024 $ 12.4