Long-Term Debt - Debt Outstanding (Details) - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025
Debt Instrument [Line Items]
Total principal debt issued	$ 1,341.8
Less: current debt obligations	(9.5)	$ (9.5)
Less: debt issuance costs and discounts	(15.4)
Long-term debt	1,316.9	$ 1,388.7
Secured Debt \| Term Loan due March 2029
Debt Instrument [Line Items]
Total principal debt issued	$ 641.8
Senior Notes \| 5.00% Notes due February 2030
Debt Instrument [Line Items]
Stated interest rate	5.00%
Total principal debt issued	$ 500.0
Senior Notes \| 6.75% Notes due February 2030
Debt Instrument [Line Items]
Stated interest rate	6.75%
Total principal debt issued	$ 200.0

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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