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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Income tax expense	$ 248.0	$ 344.8	$ 506.0	$ 636.6
Effective tax rate (percent)	23.20%	22.60%	23.20%	22.90%
Deferred tax assets net of DTL	$ 89.5		$ 89.5		$ 182.4
Valuation allowance for deferred income taxes	$ 14.9		$ 14.9		$ 14.9

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The unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, before the valuation allowance.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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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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