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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Sep. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Q4 2017 $ 24.5
2018 96.1
2019 89.1
2020 83.9
2021 77.4
2022 $ 70.1