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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, 2021
Dec. 31, 2020
Unrecorded Unconditional Purchase Obligation [Line Items]    
Purchase commitment $ 10,000 $ 13,000
Unfunded commitments related to other investments 649,000 588,000
Collateral in Trust for third-party agreements $ 2,412,882 1,903,274
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 $ 19,000 0
CMBS    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Purchase commitment 33,000 46,000
Lloyd's    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Collateral in Trust for third-party agreements $ 900,000 $ 1,200,000