Debt (Tables)

6 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of Long-term Debt

The detail of long-term debt was as follows:

	March 31, 2024		September 30, 2023
Senior notes, fixed interest rate of 5.5%, due 2028	$	750.0	$	750.0
Senior notes, fixed interest rate of 4.1%, due 2029	500.0		500.0
U.S. revolving credit facility	111.0		122.0
Total	1,361.0		1,372.0
Less unamortized debt issuance costs and discount (1)	10.2		11.3
Total long-term debt	$	1,350.8	$	1,360.7

(1)As of March 31, 2024, debt issuance costs were $6.2 and $4.0 related to the Senior Notes due 2028 and the Senior Notes due 2029, respectively. As of September 30, 2023, debt issuance costs were $6.9 and $4.4 related to the Senior Notes due 2028 and the Senior Notes due 2029, respectively.