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Intangible Assets - Projected Annual Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 7.5  
2018 6.5  
2019 5.3  
2020 5.2  
2021 5.2  
Thereafter 45.1  
Net $ 74.8 $ 81.6