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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Income Taxes
Effective tax rate (as a percent)	25.00%	19.00%	16.60%	14.20%
Federal statutory rate (as a percent)			21.00%	21.00%
Change in uncertain tax positions			$ 25.9
Income tax credits and incentives			39.0	$ 9.0
Tax expense related to nondeductible costs			11.5	25.4
Tax benefit due to corporate tax rate change			25.9
Tax expense related to audit settlement			13.2
Tax expense related to Foreign residual income			30.7	22.9
Tax expense related to state income taxes			13.2	$ 21.7
Tax benefit related to the release of a valuation allowance on net operating losses			25.4
Gross book-tax differences from non-U.S. subsidiaries	$ 1,500.0		$ 1,500.0

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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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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 increase (decrease) in the valuation allowance for deferred tax assets.

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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 increase (decrease) in the income tax rates.

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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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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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