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Fair Value Measurements - Fair Value of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2026	Sep. 30, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discounts and issuance costs	$ (19.3)	$ (6.6)
Level 2 | Fair value | Senior Notes | 2031 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	485.6	491.0
Level 2 | Carrying Value | Senior Notes | 2031 Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	531.2	531.0
Unamortized discounts and issuance costs	$ (3.8)	$ (4.0)

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