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Intangible Assets (Projected Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
2022 $ 34.7  
2023 33.2  
2024 32.1  
2025 30.8  
2026 29.2  
Thereafter 220.4  
Total future amortization expense $ 380.4 $ 394.8