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Intangible Assets (Projected Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]    
2023 $ 29.9  
2024 28.8  
2025 27.7  
2026 26.7  
2027 26.3  
Thereafter 175.0  
Total future amortization expense $ 314.4 $ 380.4