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Long-Term Debt - Scheduled Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Sep. 30, 2022
Debt Disclosure [Abstract]    
2023 $ 3.0  
2024 12.0  
2025 192.0  
2026 12.0  
2027 and thereafter 1,149.0  
Total long-term debt 1,368.0  
Less: Current portion of long-term debt 12.0 $ 12.0
Less: Original issue discount 10.4  
Less: Financing costs 9.4  
Total long-term debt, net $ 1,336.2 $ 1,330.7