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Intangible Assets (Projected Annual Amortization Expense for Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]    
2024 $ 30.4  
2025 29.2  
2026 28.2  
2027 27.7  
2028 25.6  
Thereafter 156.4  
Total future amortization expense $ 297.5 $ 314.4