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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Q3 - Q4 2018 $ 8.3
2019 28.0
2020 22.9
2021 17.6
2022 10.3
2023 $ 7.9