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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2021 | Jun. 30, 2022 | Sep. 30, 2020
Tax cuts and jobs act, other tax effect, description |  |  | In 2019, acknowledging that taxpayers may require multiple tax accounting method changes associated with the implementation of the Tax Cuts and Jobs Act of 2017, the IRS waived the five-year “eligibility rule” for certain tax accounting method changes for the first three years ending on or after November 20, 2018. Citing a need to help companies impacted by the COIVD-19 pandemic, the Coronavirus Aid, Relief, and Economic Security Act allows a taxpayer to carryback net operating losses generated in years beginning after December 31, 2017 and before January 1, 2021 for five years. |  |  |  |
Discrete tax benefit related to tax plan | $ 69.9 |  | $ 69.9 |  |  |  |
Income tax expense (benefit) | (21.9) | $ 28.0 | 24.5 | $ 87.0 |  |  |
Pre-tax income | 192.5 | $ 108.4 | $ 408.2 | $ 312.4 |  |  |
Effective income tax rate (as a percent) |  | 25.80% | 6.00% | 27.80% |  |  |
Federal provision-to-return adjustment |  |  |  | $ (2.0) |  |  |
Income tax expense (benefit), tax credit, discrete items |  |  |  | 10.1 |  |  |
Income tax expense (benefit) related to uncertain tax position reserve |  |  |  | 1.9 |  |  |
Liability for unrecognized tax benefits uncertainty of tax position | 16.6 |  | $ 16.6 |  |  |  |
Unrecognized tax benefits | 49.9 |  | 49.9 |  |  |  | $ 79.8
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized | 25.9 |  | 25.9 |  |  |  |
Interest and penalties |  |  | 1.4 | 1.0 |  |  |
Accruals for payment of interest and penalties | $ 7.1 |  | $ 7.1 |  |  |  |
Foreign Tax Authority |  |  |  |  |  |  |
Valuation allowance on foreign or state net deferred tax assets |  |  |  | $ 11.4 |  |  |
Scenario Forecast |  |  |  |  |  |  |
Net Operating loss |  |  |  |  | $ 725.0 |  |
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit |  |  |  |  |  | $ 9.6 |

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