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Intangible Assets (Projected Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
2021 $ 36.6  
2022 34.1  
2023 33.0  
2024 31.8  
2025 30.7  
Thereafter 228.6  
Total future amortization expense $ 394.8 $ 375.4