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FAIR VALUE MEASUREMENTS - Schedule of Quantitative Information Used as Level 3 Inputs (Details) $ in Thousands | Mar. 31, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) $ / shares
--- | --- | ---
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 4,239,952 | $ 4,324,761
Other liabilities | (1,334) | (2,434)
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 4,239,952 | 4,324,761
Other liabilities |  | (41,745)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 33,497,309 | 32,494,941
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (234) | (405)
Fair Value, Measurements, Recurring | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 38,987 | 43,777
Other liabilities | (234) | (405)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 38,753 | 43,372
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (234) | (405)
Fair Value, Measurements, Recurring | Direct private equity investments | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 38,987 | 43,777
Fair Value, Measurements, Recurring | Direct private equity investments | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 38,987 | $ 43,777
Fair Value, Measurements, Recurring | Discount rate | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 0.040 | 0.044
Fair Value, Measurements, Recurring | Discount rate | Direct private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | $ / shares | 0.140 | 0.100
Fair Value, Measurements, Recurring | Liquidity discount | Direct private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | $ / shares | 0.100 | 0.150
Fair Value, Measurements, Recurring | Net undiscounted cash flows | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 12,702,000 | 12,657,000
Fair Value, Measurements, Recurring | Expected loss ratio | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs (in dollars per share) | 0.009 | 0.012

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