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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]    
2018 $ 22.1  
2019 21.8  
2020 21.6  
2021 20.1  
2022 17.4  
Thereafter 218.4  
Total future amortization expense $ 321.4 $ 325.2