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Investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investments [Line Items] |  |  |
Other investments | $ 3,515,566 | $ 2,494,954 |
Initial commitments | 3,600,000 | 2,900,000 |
Fulfilled commitments | 2,000,000 | 1,700,000 |
Unfunded commitments | $ 1,600,000 | 1,200,000 |
Maturity period | 5 years |  |
Other investments |  |  |
Schedule of Investments [Line Items] |  |  |
Net unrealized gain (loss) recognized in earnings due to change in estimate | $ (3,000) | 19,800 | $ 7,000
Catastrophe bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | $ 1,942,199 | 1,241,468 |
Catastrophe bonds | Low |  |  |
Schedule of Investments [Line Items] |  |  |
Maturity period | 1 year |  |
Catastrophe bonds | High |  |  |
Schedule of Investments [Line Items] |  |  |
Maturity period | 5 years |  |
Fund investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | $ 1,415,804 | 1,086,706 |
Term loans |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | 97,658 | 100,000 |
Direct private equity investments |  |  |
Schedule of Investments [Line Items] |  |  |
Other investments | $ 59,905 | $ 66,780 |

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