Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Discontinued Operations and Disposal Groups [Abstract]
Pre-tax loss from discontinued operations	$ 10.6	$ 19.4		$ 10.6	$ 19.4
Income (Loss) from discontinued operations, net of tax			$ 7.4	(8.0)	(13.9)	$ 7.4
Cash provided by discontinued operations, tax refund				$ 0.0	$ 0.0	$ 0.6

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details