Income Taxes - Schedule of Components of Income Tax Expense (Benefit) and Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 2.3	$ 8.7	$ (18.1)	$ (5.9)
Income tax expense (benefit)	$ 0.6	$ 2.3	$ (4.6)	$ (1.9)
Effective income tax rate	26.10%	26.40%	25.40%	32.20%

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details