Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Sep. 30, 2025
Debt Instrument [Line Items]
Financing costs, net	$ (4.8)	$ (5.3)
Total debt, net	801.1	790.2
Less: Current portion of long-term debt	0.0	0.0
Long-term debt, net	801.1	790.2
Series B Term Loan
Debt Instrument [Line Items]
Debt instruments net of original issue discount	734.2	733.9
Receivables Financing Agreement
Debt Instrument [Line Items]
Debt instruments net of original issue discount	$ 71.7	$ 61.6