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Goodwill and Other Intangible Assets - Schedule of Estimated Annual Amortization Expense Related to Other Intangible Assets (Detail)
$ in Millions
Sep. 30, 2016
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2016 $ 65.4
2017 60.7
2018 54.7
2019 50.4
2020 46.5
2021 and thereafter 143.1
Total $ 420.8