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Debt (Tables)
 12 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
The detail of long-term debt was as follows:
September 30,
2024		September 30,
2023
Senior notes, fixed interest rate of 5.5%, due 2028 (1)
$750.0 $750.0 
Senior notes, fixed interest rate of 4.1%, due 2029 (1)
500.0 500.0 
Revolving credit facility34.0 122.0 
Total long-term debt, including current maturities1,284.0 1,372.0 
Less unamortized debt issuance costs and discount (1)
9.0 11.3 
Total long-term debt$1,275.0 $1,360.7 
(1)At September 30, 2024, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $5.4 and $3.6, respectively. At September 30, 2023, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $6.9 and $4.4, respectively.