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Income Taxes - Schedule of Income Tax Expense/(Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense attributable to income from operations	$ 93.3	$ 84.5	$ 70.1
Taxes allocated to stockholders’ equity, related to pension liabilities	0.3	0.2	(0.1)
Taxes allocated to stockholders’ equity, related to hedge accounting	8.1	11.1	(17.0)
Total income tax expense	$ 101.7	$ 95.8	$ 53.0

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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, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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