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Investments - Schedule of Other Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Other investments $ 3,515,566 $ 2,494,954  
Initial commitments 3,600,000 2,900,000  
Fulfilled commitments 2,000,000 1,700,000  
Unfunded commitments $ 1,600,000 1,200,000  
Maturity period 5 years    
Other investments      
Schedule of Investments [Line Items]      
Net unrealized gain (loss) recognized in earnings due to change in estimate $ (3,000) 19,800 $ 7,000
Catastrophe bonds      
Schedule of Investments [Line Items]      
Other investments $ 1,942,199 1,241,468  
Catastrophe bonds | Low      
Schedule of Investments [Line Items]      
Maturity period 1 year    
Catastrophe bonds | High      
Schedule of Investments [Line Items]      
Maturity period 5 years    
Fund investments      
Schedule of Investments [Line Items]      
Other investments $ 1,415,804 1,086,706  
Term loans      
Schedule of Investments [Line Items]      
Other investments 97,658 100,000  
Direct private equity investments      
Schedule of Investments [Line Items]      
Other investments $ 59,905 $ 66,780