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Long-Term Debt - Debt Outstanding (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Total principal debt issued $ 1,489.1  
Less: current debt obligations (9.5) $ (9.5)
Less: debt issuance costs and discounts (20.8)  
Long-term debt 1,458.8 $ 1,565.3
Secured Debt | Term Loan due March 2029    
Debt Instrument [Line Items]    
Total principal debt issued $ 789.1  
Senior Notes | 5.00% Notes due February 2030    
Debt Instrument [Line Items]    
Stated interest rate 5.00%  
Total principal debt issued $ 500.0  
Senior Notes | 6.75% Notes due February 2030    
Debt Instrument [Line Items]    
Stated interest rate 6.75%  
Total principal debt issued $ 200.0