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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
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