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Goodwill and Other Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Detail)
$ in Millions
Mar. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Q2-Q4 2016 $ 113.2
2017 150.1
2018 148.6
2019 146.1
2020 139.3
2021 $ 134.2