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FAIR VALUE MEASUREMENTS - Schedule of Quantitative Information Used as Level 3 Inputs (Details) $ in Thousands | Mar. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares
--- | --- | ---
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 3,468,281 | $ 3,515,566
Other liabilities | (1,823) | (2,742)
Fair Value, Measurements, Recurring |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 3,468,281 | 3,515,566
Other liabilities | (3,004) |
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 29,533,894 | 29,117,736
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other liabilities | (517) | (515)
Fair Value, Measurements, Recurring | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 157,397 | 157,563
Other liabilities | (517) | (515)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 156,880 | 157,048
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 | (517) | (515)
Fair Value, Measurements, Recurring | Direct private equity investments | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 59,964 | 59,905
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 | 59,964 | 59,905
Fair Value, Measurements, Recurring | Term loans | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 97,433 | 97,658
Fair Value, Measurements, Recurring | Term loans | Internal valuation model | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | 97,400 | 97,700
Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | Fair Value (Level 3) |  |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] |  |
Other investments | $ 97,433 | $ 97,658
Discount rate | Fair Value, Measurements, Recurring | 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) | 0.042 | 0.038
Discount rate | Fair Value, Measurements, Recurring | 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 | 0.100
Liquidity discount | Fair Value, Measurements, Recurring | 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 | 0.150 | 0.150
Credit spread adjustment | Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | 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 | 0.002 | 0.002
Risk premium | Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | 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 | 0.026 | 0.026
Net undiscounted cash flows | Fair Value, Measurements, Recurring | 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) | 12,523,000 | 12,478,000
Expected loss ratio | Fair Value, Measurements, Recurring | 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) | 0.020 | 0.023

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