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FAIR VALUE MEASUREMENTS - Schedule of Quantitative Information Used as Level 3 Inputs (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments $ 4,324,761 $ 3,515,566
Other liabilities (2,434) (2,742)
Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 4,324,761 3,515,566
Other liabilities (41,745)  
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 32,494,941 29,117,736
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 43,777 157,563
Other liabilities (405) (515)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 43,372 157,048
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities (405) (515)
Fair Value, Measurements, Recurring | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities (405) (515)
Fair Value, Measurements, Recurring | Direct private equity investments | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 43,777 59,905
Fair Value, Measurements, Recurring | Direct private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments $ 43,777 59,905
Fair Value, Measurements, Recurring | Term loans | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments   97,658
Fair Value, Measurements, Recurring | Term loans | Internal valuation model | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments   97,700
Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments   $ 97,658
Fair Value, Measurements, Recurring | Discount rate | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs 0.044 0.038
Fair Value, Measurements, Recurring | Discount rate | Direct private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs 0.100 0.100
Fair Value, Measurements, Recurring | Liquidity discount | Direct private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs 0.150 0.150
Fair Value, Measurements, Recurring | Credit spread adjustment | Term loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs   0.002
Fair Value, Measurements, Recurring | Risk premium | Term loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs   0.026
Fair Value, Measurements, Recurring | Net undiscounted cash flows | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs 12,657,000 12,478,000
Fair Value, Measurements, Recurring | Expected loss ratio | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs 0.012 0.023