Debt (Details) - USD ($)	Jun. 30, 2024		Apr. 02, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Total	$ 1,300,000,000			$ 1,372,000,000
Long-term debt	1,290,400,000			1,360,700,000
Notes payable	21,400,000			19,500,000
Unamortized debt issuance costs	$ 9,600,000	[1]		$ 11,300,000
Short-Term Debt, Weighted Average Interest Rate, at Point in Time	3.80%			3.90%
2024 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit, Current			$ 425,000,000.0
Senior notes | Senior Notes, Due 2028
Debt Instrument [Line Items]
Total	$ 750,000,000.0			$ 750,000,000.0
Unamortized debt issuance costs	$ 5,800,000			6,900,000
Long term debt, stated interest rate	5.50%
Minimum Debt amount	$ 150.0
Senior notes | Senior Notes, Due 2029
Debt Instrument [Line Items]
Total	500,000,000.0			500,000,000.0
Unamortized debt issuance costs	$ 3,800,000			4,400,000
Long term debt, stated interest rate	4.125%
Minimum Debt amount	$ 150.0
Revolving credit facility
Debt Instrument [Line Items]
Total	$ 50,000,000.0			$ 122,000,000.0

[1] As of June 30, 2024, debt issuance costs were $5.8 and $3.8 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.