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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 3,515,566 | $ 2,494,954 |
Other liabilities | (2,742) | (5,331) |
Carrying Value | 1,958,655 | 1,170,442 |
Fair Value | 1,900,000 | 1,100,000 |
Other investments | Included in net investment income |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) included in net investment income | 137,300 | (181,200) | $ 41,700
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 3,515,566 | 2,494,954 |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 157,563 | 166,780 |
Other liabilities | (515) | (1,832) |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Assumed reinsurance contract |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | (515) | (1,832) |
Significant Unobservable Inputs (Level 3) | Direct private equity investments | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 59,905 | 66,780 |
Significant Unobservable Inputs (Level 3) | Direct private equity investments | Fair Value, Measurements, Recurring | Internal valuation model |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 59,905 | 66,780 |
Significant Unobservable Inputs (Level 3) | Term loans | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 97,658 | 100,000 |
Significant Unobservable Inputs (Level 3) | Term loans | Fair Value, Measurements, Recurring | Internal valuation model |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 97,700 | $ 100,000 |
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.10% | 4.30% |
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.70% | 6.30% |
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.60% | 4.60% |
Non-U.S. government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.40% | 4.70% |
Residential mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.10% | 5.40% |
Weighted average life | 7 years 8 months 12 days | 8 years 7 months 6 days |
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 8.80% | 7.40% |
Weighted average life | 2 years 2 months 12 days | 3 years 2 months 12 days |
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 7.00% | 7.40% |
Weighted average life | 3 years 10 months 24 days | 5 years 2 months 12 days |
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.30% | 4.10% |
Other Short Term Investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.30% | 0.40% |
Private credit funds | Low |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 5 years |  |
Private credit funds | High |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 10 years |  |
Direct private equity investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 59,905 | $ 66,780 |
Direct private equity investments | Low |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 5 years |  |
Direct private equity investments | High |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 10 years |  |

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