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FAIR VALUE MEASUREMENTS - Schedule of Quantitative Information Used as Level 3 Inputs (Details) $ in Thousands | Jun. 30, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) $ / shares
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Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | $ 23,332,063 | $ 23,562,514
Other investments | 4,476,056 | 4,324,761
Other assets and (liabilities) | (317) | (2,434)
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 23,332,063 | 23,562,514
Other investments | 4,476,056 | 4,324,761
Other assets and (liabilities) |  | (41,745)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 34,404,596 | 32,494,941
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other assets and (liabilities) | (150) | (405)
Fair Value, Measurements, Recurring | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 40,936 | 0
Other investments | 35,308 | 43,777
Other assets and (liabilities) | (150) | (405)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 76,094 | 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 assets and (liabilities) | (150) | (405)
Fair Value, Measurements, Recurring | Asset-backed |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 1,454,458 | 1,422,393
Fair Value, Measurements, Recurring | Asset-backed | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 40,936 | 0
Fair Value, Measurements, Recurring | Asset-backed | Discounted cash flow | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 40,936 |
Fair Value, Measurements, Recurring | Direct private equity investments | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 35,308 | 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 | $ 35,308 | $ 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 | 0.038 | 0.044
Fair Value, Measurements, Recurring | Discount rate | Asset-backed | Discounted cash flow | Fair Value (Level 3) | Weighted Average or Actual |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Unobservable measurement input | $ / shares | 0.113 |
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 | $ / 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 | $ / 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 | 12,746,000 | 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 | 0.006 | 0.012

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