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Income Taxes - Schedule of Income Tax Expense/(Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense attributable to income from operations	$ 102.9	$ 93.3	$ 84.5
Taxes allocated to stockholders’ equity, related to pension liabilities	0.0	0.3	0.2
Taxes allocated to stockholders’ equity, related to hedge accounting	0.2	8.1	11.1
Total income tax expense	$ 103.1	$ 101.7	$ 95.8

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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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