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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Mar. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Q4 2016 $ 72.4
2017 95.4
2018 92.9
2019 86.1
2020 81.1
2021 $ 74.9