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Long-Term Debt - Scheduled Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Debt Disclosure [Abstract]    
2024 $ 0.0  
2025 163.0  
2026 0.0  
2027 0.0  
2028 and thereafter 738.0  
Total long term debt 901.0  
Less: Current portion of long-term debt 0.0 $ 12.0
Less: Original issue discount 6.3  
Less: Financing costs 6.6  
Total long-term debt, net $ 888.1 $ 1,330.7