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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