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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income Taxes |  |
Effective tax rate (as a percent) | 19.50% | 21.00%
Tax at federal statutory rate (as a percent) | 21.00% | 21.00%
Tax benefit related to income tax credits and incentives | $ 13.0 | $ 8.6
Tax expense related to foreign residual income | 11.3 | $ 8.5
Tax expense related to state income taxes | 4.2 |
Tax expense related to audit settlement | 6.9 |
Tax expense related to valuation allowances | 4.4 |
Gross book-tax differences from non-U.S. subsidiaries | $ 1,300.0 |

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