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INVESTMENTS - Summary of Restricted Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Restricted Investments [Line Items]    
Collateral in Trust for inter-company agreements $ 790,449 $ 886,903
Collateral for secured letter of credit facility 424,624 402,478
Funds at Lloyd's 748,573 936,862
Collateral in Trust for third-party agreements 2,491,317 2,412,882
Securities on deposit or in trust with regulatory authorities 731,660 729,072
Total restricted investments and cash 5,186,623 5,368,197
Syndicate 1686 | Fixed maturities    
Restricted Investments [Line Items]    
Collateral in Trust for third-party agreements 539,000 507,000
Syndicate 1686 | Cash    
Restricted Investments [Line Items]    
Collateral in Trust for third-party agreements $ 217,000 $ 326,000
Axis Corporate Capital UK Limited    
Restricted Investments [Line Items]    
Capital support, percentage 70.00%  
Axis Corporate Capital UK Limited II    
Restricted Investments [Line Items]    
Capital support, percentage 30.00%