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Taxation - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred tax asset, increase (decrease), net, amount | $ 593,800,000 |  |  |
Deferred tax asset, utilization period | 10 years |  |  |
Increase (decrease) in valuation allowance |  | $ 19,600,000 | $ 62,100,000 | $ 42,800,000
Unrealized losses in the US investment portfolio |  | 186,200,000 |  |
Income taxes paid (refunded) |  | 26,777,000 | 3,129,000 | $ (4,261,000)
Unrecognized tax benefits | $ 0 | 0 | 0 |
Interest and penalties accrued on unrecognized tax benefits | 0 | $ 0 | $ 0 |
Bermuda |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Statutory income tax rate |  | 0.00% |  |
U.S. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Expected tax rate |  | 5.00% |  |
Foreign statutory income tax rate |  | 21.00% |  |
U.S. | 2037 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 167,000,000 | $ 167,000,000 |  |
U.S. | 2027 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 105,700,000 | $ 105,700,000 |  |
Ireland |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 12.50% |  |
Operating loss carryforwards | 7,800,000 | $ 7,800,000 |  |
U.K. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 23.50% |  |
Operating loss carryforwards | 185,600,000 | $ 185,600,000 |  |
Singapore |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 17.00% |  |
Operating loss carryforwards | 5,600,000 | $ 5,600,000 |  |
Switzerland |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 19.70% |  |
Switzerland | 2024 |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 570,900,000 | $ 570,900,000 |  |
Luxembourg |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 24.90% |  |
Operating loss carryforwards | $ 155,700,000 | $ 155,700,000 |  |
Canada |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 15.00% |  |
Australia |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Foreign statutory income tax rate |  | 30.00% |  |

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