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Employee Benefit Plans (Details) - USD ($) $ in Millions | 2 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Oct. 19, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Amount recognized in accumulated other comprehensive loss | $ 1.6 |  | $ 2.2 | $ 2.8 |
Estimated future benefit payments | 5.1 |  |  |  |
Benefits expense | 0.6 | $ 1.0 | 3.7 | 3.1 | $ 1.7
Defined Benefit Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Business expense | 0.3 | $ 0.3 | 1.2 | 1.2 | $ 1.1
Unfunded benefit plan | Defined Benefit Pension Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit obligation | 11.4 |  | 12.3 | 11.9 |
Unfunded benefit plan | Other Postretirement Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Benefit obligation | $ 0.6 |  | $ 0.7 | $ 0.7 |

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