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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 3,468,281 |  | $ 3,515,566
Other liabilities | (1,823) |  | (2,742)
Debt | 1,884,411 |  | 1,958,655
Long-term debt, fair value | 1,900,000 |  | 1,900,000
Net Investment Income | Term loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net unrealized gains (losses) recognized in earnings | 26,000 | $ 30,200 |
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 3,468,281 |  | 3,515,566
Other liabilities | (3,004) |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 157,397 |  | 157,563
Other liabilities | (517) |  | (515)
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Direct private equity investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 59,964 |  | 59,905
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Term loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 97,433 |  | 97,658
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other liabilities | (517) |  | (515)
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Direct private equity investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | 59,964 |  | 59,905
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Term loans |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Other investments | $ 97,400 |  | $ 97,700
U.S. Treasuries |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 4.40% |  | 4.10%
Corporate |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.80% |  | 5.70%
Agencies |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.00% |  | 4.60%
Non-U.S. Government |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 4.70% |  | 4.40%
Residential Mortgage-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.30% |  | 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 effective yield | 6.90% |  | 8.80%
Weighted average life | 2 years 7 months 6 days |  | 2 years 2 months 12 days
Asset-backed |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 6.90% |  | 7.00%
Weighted average life | 4 years 3 months 18 days |  | 3 years 10 months 24 days
Short Term Investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.10% |  | 5.30%
Other Short Term Investments |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Weighted average effective yield | 5.10% |  | 5.30%
Private Credit Funds | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 5 years |  |
Private Credit Funds | Maximum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 10 years |  |
Direct private equity investments | Minimum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 5 years |  |
Direct private equity investments | Maximum |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Liquidation period for fund assets | 10 years |  |

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