v3.26.1
Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Sep. 30, 2025
Debt Instrument [Line Items]    
Total long-term debt, including current maturities $ 1,250.0 $ 1,390.0
Long-term debt 1,245.0 1,383.3
Unamortized debt issuance costs (5.0) (6.7)
Notes payable $ 34.2 $ 29.5
Notes payable, weighted-average interest rate 3.40% 3.70%
Senior notes | Senior notes due 2028    
Debt Instrument [Line Items]    
Total long-term debt, including current maturities $ 750.0 $ 750.0
Unamortized debt issuance costs (2.8) (3.9)
Senior notes | Senior Notes, Due 2029    
Debt Instrument [Line Items]    
Total long-term debt, including current maturities [1] 500.0 500.0
Unamortized debt issuance costs (2.2) (2.8)
Revolving Credit Facility    
Debt Instrument [Line Items]    
Letters of Credit Outstanding, Amount [1] $ 0.0 $ 140.0
[1] At June 30, 2026, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $2.8 and $2.2, respectively. At September 30, 2025, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $3.9 and $2.8, respectively.