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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Financing costs, net $ (6.5) $ (6.6)
Total debt, net 802.5 888.1
Less: Current portion of long-term debt 0.0 0.0
Long-term debt, net 802.5 888.1
Series B Term Loan    
Debt Instrument [Line Items]    
Debt instruments net of original issue discount 732.8 731.7
Receivables Financing Agreement    
Debt Instrument [Line Items]    
Debt instruments net of original issue discount $ 76.2 $ 163.0