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Intangible Assets (Projected Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 35.3  
2021 33.5  
2022 30.8  
2023 29.6  
2024 28.6  
Thereafter 217.6  
Total future amortization expense $ 375.4 $ 387.3