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FAIR VALUE MEASUREMENTS - Schedule of Quantitative Information Used as Level 3 Inputs (Details) $ in Thousands | Sep. 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 | $ 23,772,222 | $ 23,562,514
Other investments | 4,432,389 | 4,324,761
Other assets and (liabilities) | (197) | (2,434)
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 23,772,222 | 23,562,514
Other investments | 4,432,389 | 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 | 35,709,169 | 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) | (93) | (405)
Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 38,825 | 0
Other investments | 32,512 | 43,777
Other assets and (liabilities) | (93) | (405)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 71,244 | 43,372
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other assets and (liabilities) | $ (93) | $ (405)
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual | Discount rate |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | 0.037 | 0.044
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual | Net undiscounted cash flows |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | 12,791,000 | 12,657,000
Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual | Expected loss ratio |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | 0.003 | 0.012
Asset-backed | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | $ 1,456,067 | $ 1,422,393
Asset-backed | Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | 38,825 | 0
Asset-backed | Fair Value (Level 3) | Fair Value, Measurements, Recurring | Discounted cash flow |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Fixed maturity investments trading | $ 38,825 |
Asset-backed | Fair Value (Level 3) | Fair Value, Measurements, Recurring | Discounted cash flow | Weighted Average or Actual | Discount rate |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Unobservable measurement input | $ / shares | 0.113 |
Direct private equity investments | Fair Value (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 32,512 | 43,777
Direct private equity investments | Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 32,512 | $ 43,777
Direct private equity investments | Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Weighted Average or Actual | Discount rate |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.140 | 0.100
Direct private equity investments | Fair Value (Level 3) | Fair Value, Measurements, Recurring | Internal valuation model | Weighted Average or Actual | Liquidity discount |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Significant observable and unobservable inputs | $ / shares | 0.100 | 0.150

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