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Other Intangible Assets - Schedule of Future Amortization Estimated Expense (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2016 $ 24.3
2017 24.1
2018 21.1
2019 17.7
2020 $ 17.4