Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023		Sep. 30, 2023
Debt Instrument [Line Items]
Total	$ 1,463.0		$ 1,372.0
Long-term debt	1,452.3		1,360.7
Notes payable	24.2		19.5
Unamortized debt issuance costs	10.7	[1]	11.3
Senior notes | Senior Notes, Due 2028
Debt Instrument [Line Items]
Total	750.0		750.0
Unamortized debt issuance costs	6.5		6.9
Senior notes | Senior Notes, Due 2029
Debt Instrument [Line Items]
Total	500.0		500.0
Unamortized debt issuance costs	4.2		4.4
Revolving credit facility
Debt Instrument [Line Items]
Total	$ 213.0	[2]	$ 122.0

[1] As of December 31, 2023, the balance for the Senior Notes due 2028 and the Senior Notes due 2029 are reflected net of debt issuance costs of $6.5 and $4.2, respectively. As of 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.

[2] The U.S. revolving credit facility matures in April 2025.