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Goodwill and Intangible Assets - Estimated Aggregate Finite-Lived Intangible Asset Amortization Expense (Detail)
$ in Millions
Sep. 30, 2015
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 21.7
2016 25.3
2017 24.7
2018 24.6
2019 $ 24.5