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Debt (Tables)
 12 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
The detail of long-term debt was as follows:
September 30,
2022		September 30,
2021
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 facility (2)
155.0 — 
Total long-term debt, including current maturities1,405.0 1,250.0 
Less current portion— — 
Less unamortized debt issuance costs and discount (1)
13.6 15.8 
Total long-term debt$1,391.4 $1,234.2 
(1)At September 30, 2022, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $8.3 and $5.3, respectively. At September 30, 2021, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $9.8 and $6.0, respectively.
(2)The U.S. revolving credit facility matures in 2025.