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Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure
Effective tax rate (as a percent)	29.90%	26.00%
Tax at federal statutory rate (as a percent)	21.00%	21.00%
Tax benefit related to income tax credits and incentives	$ 35.7	$ 36.4
Tax expense related to foreign residual income	32.2	31.4
Tax expense related to state income taxes	21.0	16.4
Tax expense related to uncertain tax positions		15.7
Tax expense related to nondeductible costs		11.9
Tax benefit related to changes in valuation allowances		11.6
Gross book-tax differences from non-U.S. subsidiaries	$ 1,300.0
Foreign
Income Tax Disclosure
Tax benefit related to changes in valuation allowances		$ 21.9

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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