Income Taxes - Schedule of Components of Income Tax Expense (Benefit) and Effective Income Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 8.4	$ 44.9	$ (9.7)	$ 39.0
Income tax expense (benefit)	$ 2.3	$ 12.6	$ (2.3)	$ 10.7
Effective income tax rate	27.40%	28.10%	23.70%	27.40%

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.

+ References

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