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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, U.S. | $ 269.0 | $ 236.3 | $ 34.8
Income (loss) from operations before income taxes | 464.1 | 402.6 | (27.0)
Current tax (benefit)/expense, U.S. | 62.7 | 52.4 | 14.8
Current tax (benefit)/expense, Total | 66.6 | 65.6 | 26.5
Deferred tax (benefit), U.S. | (4.4) | 3.0 | (102.9)
Deferred tax, Total | (88.6) | (197.7) | (104.6)
Total tax expense/(benefit), U.S. | 58.3 | 55.4 | (88.1)
Total tax expense/(benefit) | (22.0) | (132.1) | (78.1)
Base erosion and anti-abuse (BEAT) expense | 0.2 | 0.9 | 2.3
Bermuda |  |  |
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, Non-U.S. | 85.3 | 148.8 | (103.3)
Current tax (benefit)/expense, Non-U.S. | 0.0 | 0.0 | 0.0
Deferred tax (benefit), Non-U.S. | 1.3 | (201.1) | 0.0
Total tax expense/(benefit), Non-U.S. | 1.3 | (201.1) | 0.0
Net deferred tax asset, Bermuda | 158.9 | 156.6 |
Opening tax loss adjustment | 40.0 | 44.5 |
U.K. |  |  |
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, Non-U.S. | 106.9 | 0.7 | 62.4
Current tax (benefit)/expense, Non-U.S. | 3.9 | 5.3 | 7.0
Deferred tax (benefit), Non-U.S. | (85.3) | 0.1 | 0.0
Total tax expense/(benefit), Non-U.S. | (81.4) | 5.4 | 7.0
Deferred foreign income tax, brought forward valuation allowance | 107.7 |  |
Other |  |  |
Income Tax Examination [Line Items] |  |  |
(Loss) before tax, Non-U.S. | 2.9 | 16.8 | (20.9)
Current tax (benefit)/expense, Non-U.S. | 0.0 | 7.9 | 4.7
Deferred tax (benefit), Non-U.S. | (0.2) | 0.3 | (1.7)
Total tax expense/(benefit), Non-U.S. | $ (0.2) | $ 8.2 | $ 3.0

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