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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 4,324,761 | $ 3,515,566 |
Other liabilities | (2,434) | (2,742) |
Debt | 1,886,689 | 1,958,655 |
Fair Value | 1,900,000 | 1,900,000 |
Other Investments | Net investment income |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) included in net investment income | 243,800 | 137,300 | $ (181,200)
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 4,324,761 | 3,515,566 |
Other liabilities | (41,745) |  |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 2,152,485 | 1,942,199 |
Other liabilities | (44,082) |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 43,777 | 157,563 |
Other liabilities | (405) | (515) |
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 | (405) | (515) |
Direct private equity investments | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 168,089 | 0 |
Direct private equity investments | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Valuation Technique, Quoted Prices |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 168,100 | 0 |
Direct private equity investments | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 43,777 | 59,905 |
Direct private equity investments | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 43,777 | 59,905 |
Term loans | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments |  | 0 |
Term loans | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments |  | 97,658 |
Term loans | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments |  | $ 97,700 |
U.S. treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.40% | 4.10% |
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.50% | 5.70% |
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.70% | 4.60% |
Non-U.S. government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.50% | 4.40% |
Residential mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.40% | 5.10% |
Weighted average life | 7 years 8 months 12 days | 7 years 8 months 12 days |
Commercial mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.70% | 8.80% |
Weighted average life | 3 years 9 months 18 days | 2 years 2 months 12 days |
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 5.90% | 7.00% |
Weighted average life | 4 years 8 months 12 days | 3 years 10 months 24 days |
Short term investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.20% | 5.30% |
Other Short Term Investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average yield to maturity | 4.40% | 5.30% |
Private credit funds | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 5 years |  |
Private credit funds | Maximum |  |  |
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 | $ 211,866 | $ 59,905 |
Direct private equity investments | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 5 years |  |
Direct private equity investments | Maximum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidating period | 10 years |  |

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