v3.26.1
Debt - Schedule of Long-term Debt Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Debt Instrument [Line Items]    
Capital lease obligations $ 48.7 $ 50.3
Total long-term debt, including current maturities 3,327.3 3,445.9
Less short-term 10.2 10.1
Less debt issuance fees and debt discount (22.2) (27.9)
Total long-term debt 3,294.9 3,407.9
Senior Secured Term Loan Facility Due 2032 | Secured Debt    
Debt Instrument [Line Items]    
Long-term debt $ 761.4 857.9
Stated interest rate of debt 0.25%  
Senior Notes, 4.750%, Due 2028 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 583.7 583.7
Senior Notes, 4.375%, Due 2029 | Senior Notes    
Debt Instrument [Line Items]    
Long-term debt $ 791.3 791.3
3.50% Senior Notes due 2029 | Senior Notes    
Debt Instrument [Line Items]    
Stated interest rate of debt 3.50%  
Senior Notes, 3.50%, Due 2029 | Secured Debt    
Debt Instrument [Line Items]    
Long-term debt $ 742.2 762.7
Senior Notes, 6.00%, Due 2033 | Secured Debt    
Debt Instrument [Line Items]    
Long-term debt $ 400.0 $ 400.0