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Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, Non-U.S. | $ 16.8 | $ (20.9) | $ (67.9)
(Loss) before tax, U.S. | 236.3 | 34.8 | 5.0
Income (loss) from operations before income taxes | 402.6 | (27.0) | 35.1
Current tax (benefit)/expense, Non-U.S. | 7.9 | 4.7 | 2.7
Current tax (benefit)/expense, U.S. | 52.4 | 14.8 | 5.8
Current tax (benefit)/expense, Total | 65.6 | 26.5 | 8.5
Deferred tax (benefit), Non-U.S. | 0.3 | (1.7) | (2.9)
Deferred tax (benefit), U.S. | 3.0 | (102.9) | 0.0
Deferred tax, Total | (197.7) | (104.6) | (3.2)
Total tax expense/(benefit), Non-U.S. | 8.2 | 3.0 | (0.2)
Total tax expense/(benefit), U.S. | 55.4 | (88.1) | 5.8
Total tax expense/(benefit) | (132.1) | (78.1) | 5.3
Base erosion and anti-abuse (BEAT) expense | 0.9 | 2.3 | 6.1
Bermuda |  |  |
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, Non-U.S. | 148.8 | (103.3) | 22.9
Current tax (benefit)/expense, Non-U.S. | 0.0 | 0.0 | 0.0
Deferred tax (benefit), Non-U.S. | (201.1) | 0.0 | 0.0
Total tax expense/(benefit), Non-U.S. | (201.1) | 0.0 | 0.0
Net deferred tax asset, Bermuda | 156.6 |  |
Opening tax loss adjustment | $ 44.5 |  |
Deferred tax asset, utilization period | 10 years |  |
U.K. |  |  |
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, Non-U.S. | $ 0.7 | 62.4 | 75.1
Current tax (benefit)/expense, Non-U.S. | 5.3 | 7.0 | 0.0
Deferred tax (benefit), Non-U.S. | 0.1 | 0.0 | (0.3)
Total tax expense/(benefit), Non-U.S. | $ 5.4 | $ 7.0 | $ (0.3)

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