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INVESTMENTS - Restricted Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Restricted Investments [Line Items]    
Collateral in trust for inter-company agreements $ 2,549,220 $ 614,089
Collateral for secured letter of credit facility 208,090 423,522
Funds at Lloyd's 883,362 893,177
Collateral in trust for third-party agreements 2,602,306 2,597,633
Securities on deposit or in trust with regulatory authorities 632,268 772,472
Total restricted investments and cash 6,875,246 5,300,893
AXIS Specialty Insurance Bermuda    
Restricted Investments [Line Items]    
Collateral assets held in trust 2,000,000  
Syndicate 1686 | Fixed maturities    
Restricted Investments [Line Items]    
Collateral in trust for third-party agreements 572,000 550,000
Syndicate 1686 | Cash    
Restricted Investments [Line Items]    
Collateral in trust for third-party agreements $ 237,000 $ 296,000