Debt - Schedule of Long Term Debt (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Term Loan	$ 1,598,100,000
Debt issuance costs and discounts	(12,000,000.0)	$ (12,400,000)
Total debt	1,586,100,000	1,687,600,000
Current portion of long-term debt	23,800,000	162,500,000
Long-term debt	1,562,300,000	1,525,100,000
Line of Credit | Secured Debt
Debt Instrument [Line Items]
Term Loan	463,100,000
Trade Receivables Facility | Revolver
Debt Instrument [Line Items]
Trade Receivables Facility	0	105,000,000
2031 Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	535,000,000	535,000,000.0
2030 Notes | Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	600,000,000	600,000,000.0
Term Loan | Line of Credit | Secured Debt
Debt Instrument [Line Items]
Term Loan	$ 463,100,000	$ 460,000,000.0