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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 344.8	$ 295.7	$ 636.6	$ 594.6
Effective tax rate (percent)	22.60%	23.70%	22.90%	23.70%
Deferred tax assets net of DTL	$ 181.2		$ 181.2		$ 202.0
Valuation allowance for deferred income taxes	$ 14.7		$ 14.7		$ 14.8

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- Definition

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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