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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, 2015
USD ($)
Finite Lived Intangible Assets Roll Forward  
2015 $ 78.7
2016 65.3
2017 59.4
2018 53.3
2019 49.2
2020 and thereafter 186.3
Net Book Value, amortizable intangible assets $ 492.2