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Intangible Assets (Projected Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Sep. 30, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2017 $ 20.7  
2018 19.9  
2019 19.6  
2020 19.4  
2021 18.7  
Thereafter 226.9  
Total future amortization expense $ 325.2 $ 338.2