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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Mar. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Q2 - Q4 2018 $ 72.0
2019 89.4
2020 84.1
2021 77.5
2022 69.8
2023 $ 67.2