Long-Term Debt - Scheduled Maturities of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022
Debt Disclosure [Abstract]
2023	$ 9.0
2024	12.0
2025	237.0
2026	12.0
2027 and thereafter	1,173.0
Total long-term debt	1,443.0
Less: Current portion of long-term debt	12.0	$ 12.0
Less: Original issue discount	11.3
Less: Financing costs	10.2
Total long-term debt, net	$ 1,409.5	$ 1,330.7

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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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Amount of debt discount to be amortized after one year or the normal operating cycle, if longer.

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Amount, after accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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