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Basis of Presentation and Major Accounting Policies (Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Discontinued Operations and Disposal Groups [Abstract]
Loss from discontinued operations, pre-tax		$ 10.6
Loss from discontinued operations, net of tax	$ 0.0	$ 8.0	$ 0.0	$ 8.0

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.

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