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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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