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Income Taxes (Details) - USD ($) $ in Millions | 6 Months Ended
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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 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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