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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
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