Debt - Schedule of Long Term Debt (Details) - USD ($)	Sep. 30, 2024	Apr. 16, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Debt, gross	$ 1,099,400,000
Debt issuance costs and discounts	(5,600,000)		$ (12,000,000.0)
Total debt	1,093,800,000		1,586,100,000
Current portion of long-term debt	23,800,000		23,800,000
Long-term debt	1,070,000,000		1,562,300,000
Line of Credit | Secured Debt
Debt Instrument [Line Items]
Debt, gross	439,400,000
Line of Credit | Revolver
Debt Instrument [Line Items]
Debt, gross	125,000,000.0		0
2031 Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	535,000,000.0		535,000,000.0
2030 Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	0	$ 600,000,000.0	600,000,000.0
Term Loan | Line of Credit | Secured Debt
Debt Instrument [Line Items]
Debt, gross	$ 439,400,000		$ 463,100,000