v3.25.2
Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Present value of lease liabilities $ 49.4 $ 49.2
Total long-term debt, including current maturities 3,250.6 3,230.0
Long-Term Debt, Current Maturities (8.4) (12.6)
Less unamortized debt premium and debt issuance fees (23.8) (24.4)
Total long-term debt 3,218.4 3,193.0
Senior Secured Term Loan Facility Due 2027 | Secured Debt    
Debt Instrument [Line Items]    
Total long-term debt, including current maturities $ 0.0 782.0
Senior Secured Term Loan Facility Due 2032 | Secured Debt    
Debt Instrument [Line Items]    
Stated interest rate of debt 0.25%  
Total long-term debt, including current maturities $ 760.0 0.0
Senior Notes, 6.500%, Due 2027 | Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate of debt 6.50%  
Total long-term debt, including current maturities $ 300.0 300.0
Senior Notes, 4.750%, Due 2028 | Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate of debt 4.75%  
Total long-term debt, including current maturities $ 583.7 583.7
Senior Notes, 4.375%, Due 2029 | Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate of debt 4.375%  
Total long-term debt, including current maturities $ 791.3 791.3
3.50% Senior Notes due 2029 | Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate of debt 3.50%  
Total long-term debt, including current maturities $ 766.2 $ 723.8