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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 0.8	$ 0.7
Income tax expense (benefit)	23.5	22.0	$ 24.5
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		4.7
Unrecognized Tax Benefits	5.0	4.7	$ 4.8
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions	0.0	0.4
Unrecognized Tax Benefits, Decrease Resulting from Foreign Currency Translation	(0.1)	$ 0.1
transition tax liability	$ 4.1

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Transition Tax Liability

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.

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

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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Amount of interest expense accrued for an underpayment of income taxes.

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