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Income Taxes - Schedule of Income Before Income Tax Domestic and Foreign Current and Deferred Portions of Income Tax Benefits (Details) - USD ($) $ in Millions | 2 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Oct. 19, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Loss before income taxes | $ (29.8) | $ (111.3) | $ (105.3) | $ (306.6) | $ (164.3)
Current: |  |  |  |  |
Federal | 0.0 |  | 8.6 | 0.0 |
State and local | 0.8 |  | 2.0 | 2.9 |
Foreign | 3.8 |  | 13.7 | 16.1 |
Total current provision | 4.6 | 3.5 | 24.3 | 19.0 | 12.1
Deferred: |  |  |  |  |
Federal | (5.4) |  | (17.6) | (19.6) |
State and local | (1.2) |  | (5.5) | (4.2) |
Foreign | (4.8) |  | (7.8) | (13.4) |
Total deferred benefit | (11.4) | (9.1) | (30.9) | (37.2) | (18.0)
Total benefit from income taxes | (6.8) | (5.6) | (6.6) | (18.2) | (5.9)
United Kingdom |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss before income taxes |  | (41.2) |  |  | (125.3)
Current: |  |  |  |  |
Total current provision |  | 0.1 |  |  | 0.3
Deferred: |  |  |  |  |
Total deferred benefit |  | 0.0 |  |  | 0.0
United States |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss before income taxes | (26.8) | (61.2) | (125.0) | (169.5) | (53.8)
Current: |  |  |  |  |
Total current provision |  | 1.4 |  |  | 2.4
Deferred: |  |  |  |  |
Total deferred benefit |  | (7.0) |  |  | (15.5)
Foreign |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss before income taxes | $ (3.0) |  | $ 19.7 | $ (137.1) |
Other foreign |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Loss before income taxes |  | (8.9) |  |  | 14.8
Current: |  |  |  |  |
Total current provision |  | 2.0 |  |  | 9.4
Deferred: |  |  |  |  |
Total deferred benefit |  | $ (2.1) |  |  | $ (2.5)

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