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INVESTMENTS - Schedule of Other Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Other investments $ 4,324,761 $ 3,515,566  
Initial commitments 4,500,000 3,600,000  
Fulfilled commitments 2,500,000 2,000,000  
Unfunded commitments $ 2,000,000 1,600,000  
Maturity period 5 years    
Other Investments      
Schedule of Investments [Line Items]      
Net unrealized gain (loss) recognized in earnings due to change in estimate $ (9,700) (3,000) $ 19,800
Fund investments      
Schedule of Investments [Line Items]      
Other investments 2,128,499 1,415,804  
Catastrophe bonds      
Schedule of Investments [Line Items]      
Other investments $ 1,984,396 1,942,199  
Catastrophe bonds | Minimum      
Schedule of Investments [Line Items]      
Maturity period 1 year    
Catastrophe bonds | Maximum      
Schedule of Investments [Line Items]      
Maturity period 5 years    
Direct private equity investments      
Schedule of Investments [Line Items]      
Other investments $ 211,866 59,905  
Term loans      
Schedule of Investments [Line Items]      
Other investments $ 0 $ 97,658