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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2023	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Effective tax rate (as percent)		18.30%	23.40%
Tax at federal statutory rate (as percent)		21.00%	21.00%
Tax benefit related to income tax credits and incentives		$ 35.2	$ 29.4
Tax expense related to foreign residual income		33.2	26.2
Tax benefit related to deferred tax assets resulting from legal entity restructuring		20.1
Tax expense related to state income taxes		$ 14.0	12.3
Tax benefit related to an audit settlement			6.9
Tax expense related to valuation allowances			6.6
Deferred tax assets resulting from legal entity restructuring				$ 20.1
Tax benefit due primarily to changes in uncertain tax positions	$ 6.9
Gross book-tax differences from non-U.S. subsidiaries			$ 1,200.0

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from restructuring reserve.

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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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