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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Jun. 30, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Q3-4 2017 $ 48.7
2018 95.4
2019 88.5
2020 83.4
2021 77.1
2022 $ 70.0