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Income Taxes (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 30, 2023 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Tax Disclosure [Line Items] |  |  |  |
Effective tax rate (as a percent) |  |  | 26.00% | 16.60%
Tax at federal statutory rate (as a percent) |  |  | 21.00% | 21.00%
Tax rate changes |  |  |  | $ 25.9
Income tax credits and incentives |  |  | $ 36.4 | 39.0
Tax rate changes |  |  |  | 25.9
Tax expense related to audit settlement |  |  |  | 13.2
Benefit related to release of valuation allowance on foreign tax credits |  |  | 15.7 |
Tax expense related to Foreign residual income |  |  | 31.4 | 30.7
State income tax, net of federal benefit |  |  | 16.4 | $ 11.5
Tax benefit related to the release of a valuation allowance on net operating losses |  |  | 11.6 |
Gross book-tax differences from non-U.S. subsidiaries |  |  | 1,500.0 |
Valuation allowances |  |  | 11.9 |
Valuation allowance |  |  | 6.4 |
United Kingdom |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax at federal statutory rate (as a percent) | 25.00% | 19.00% |  |
Foreign |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax benefit related to the release of a valuation allowance on net operating losses |  |  | $ 21.9 |

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