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Income Taxes - Additional information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Income taxes |  |  |  |  |
Effective tax rate (as a percent) | 25.00% | 19.00% | 21.80% | 19.70% | 5.40%
Valuation allowance related to net operating losses and other deferred tax assets |  |  | $ 197.7 | $ 217.5 |
Corporate tax rate |  |  | 21.00% | 21.00% | 21.00%
Tax expense related to audit settlement |  |  | $ 13.2 |  |
Tax rate changes |  |  | (26.8) | $ (0.5) | $ (1.9)
Tax benefit from foreign subsidiaries |  |  | (53.2) | (55.7) | (41.7)
Change in valuation allowance |  |  | 19.8 |  |
United States |  |  |  |  |
Income taxes |  |  |  |  |
Valuation allowance related to net operating losses and other deferred tax assets |  |  |  |  | 38.1
Tax benefit from income tax examination |  |  |  |  | $ 38.1
United Kingdom |  |  |  |  |
Income taxes |  |  |  |  |
Tax rate changes |  |  | $ 25.9 |  |
Canada |  |  |  |  |
Income taxes |  |  |  |  |
Valuation allowance related to net operating losses and other deferred tax assets |  |  |  | $ 31.7 |

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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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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