v3.25.4
SCHEDULE I. SUMMARY OF INVESTMENTS OTHER THAN INVESTMENTS IN RELATED PARTIES (Details)
$ in Thousands
Dec. 31, 2025
USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value $ 36,073,209
Amount at Which Shown in the Balance Sheet 36,073,209
Fixed maturity investments trading  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 24,658,351
Fair Value 24,884,323
Amount at Which Shown in the Balance Sheet 24,884,323
U.S. treasuries  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 10,507,431
Fair Value 10,641,503
Amount at Which Shown in the Balance Sheet 10,641,503
Corporate  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 8,453,375
Fair Value 8,528,828
Amount at Which Shown in the Balance Sheet 8,528,828
Residential mortgage-backed  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 2,597,066
Fair Value 2,606,882
Amount at Which Shown in the Balance Sheet 2,606,882
Asset-backed  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 1,601,715
Fair Value 1,606,790
Amount at Which Shown in the Balance Sheet 1,606,790
Agencies  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 487,022
Fair Value 486,817
Amount at Which Shown in the Balance Sheet 486,817
Non-U.S. government  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 688,164
Fair Value 691,912
Amount at Which Shown in the Balance Sheet 691,912
Commercial mortgage-backed  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 323,578
Fair Value 321,591
Amount at Which Shown in the Balance Sheet 321,591
Short term investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amortized Cost or Cost 4,760,027
Fair Value 4,759,811
Amount at Which Shown in the Balance Sheet 4,759,811
Equity investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 1,732,990
Amount at Which Shown in the Balance Sheet 1,732,990
Fixed income exchange traded funds  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 1,582,811
Amount at Which Shown in the Balance Sheet 1,582,811
Common Stock  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 150,179
Amount at Which Shown in the Balance Sheet 150,179
Total other investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Amount at Which Shown in the Balance Sheet 4,574,214
Fund investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 2,775,499
Amount at Which Shown in the Balance Sheet 2,775,499
Catastrophe bonds  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 1,613,710
Amount at Which Shown in the Balance Sheet 1,613,710
Direct private equity investments  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 185,005
Amount at Which Shown in the Balance Sheet 185,005
Investments in other ventures, under equity method  
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]  
Fair Value 121,871
Amount at Which Shown in the Balance Sheet $ 121,871