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COMMITMENTS AND CONTINGENCIES - Reinsurance Purchase Commitment, Investments and Funds at Lloyd's (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Unrecorded Unconditional Purchase Obligation [Line Items]    
Purchase commitment $ 11,000 $ 10,000
Unfunded commitments related to other investments 508,000 649,000
Collateral in Trust for third-party agreements $ 2,491,317 2,412,882
Axis Corporate Capital UK Limited    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Capital support, percentage 70.00%  
Axis Corporate Capital UK Limited II    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Capital support, percentage 30.00%  
Corporate debt    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Purchase commitment $ 20,000 19,000
CMBS    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Purchase commitment 25,000 33,000
Lloyd's    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Collateral in Trust for third-party agreements $ 749,000 $ 937,000