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Income Taxes (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Income Taxes |  |
Effective tax rate (as a percent) | 23.60% | 29.90%
Tax at federal statutory rate (as a percent) | 21.00% | 21.00%
Tax benefit related to income tax credits and incentives | $ 46.1 | $ 35.7
Tax expense related to foreign residual income | 39.7 | 32.2
Tax expense related to state income taxes | 18.2 |
Exclusion of tax on non-controlling interests | 8.4 |
Tax expense related to valuation allowances | 7.4 | $ 21.0
Tax expense related to audit settlement | 6.9 |
Nondeductible costs | 5.6 |
Gross book-tax differences from non-U.S. subsidiaries | $ 1,300.0 |

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