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Intangible Assets - Projected Annual Amortization Expense for Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2017 $ 7.2  
2018 5.9  
2019 5.8  
2020 5.8  
2021 4.9  
Thereafter 41.2  
Net $ 70.8 $ 74.8