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Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Taxes
Effective tax rate (as a percent)	23.40%	23.10%
Tax expense related to state income taxes	$ 12.3	$ 9.0
Tax at federal statutory rate (as a percent)	21.00%	21.00%
Tax benefit related to income tax credits and incentives	$ 29.4	$ 23.6
Tax expense related to foreign residual income	26.2	$ 19.1
Tax expense related to audit settlement	6.9
Tax expense related to valuation allowances	6.6
Gross book-tax differences from non-U.S. subsidiaries	$ 1,300.0

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- Definition

Amount of gross book tax differences of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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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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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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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 repatriation of foreign earnings.

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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 state and local income tax expense (benefit).

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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