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VARIABLE INTEREST ENTITIES (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 10, 2020
USD ($)
note
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 29, 2021
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]                    
Assets   $ 35,935,835   $ 35,935,835     $ 33,959,502      
Liabilities   26,879,003   26,879,003     23,781,168      
Redeemable noncontrolling interests   4,174,960   4,174,960     3,554,053      
Ceded premiums written   398,950 $ 287,740 1,777,720 $ 1,697,965          
Ceded premiums earned   519,964 508,622 1,399,008 1,384,147          
Investments in other ventures, under equity method   72,535   72,535     98,068      
Vermeer Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests   1,330,253 1,130,784 1,330,253 1,130,784 $ 1,269,417 1,197,782 $ 1,133,443   $ 1,109,627
Fontana                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests   261,530 $ 0 261,530 0 $ 268,143 0 $ 0   $ 0
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.                    
Variable Interest Entity [Line Items]                    
Assets   4,100,000   4,100,000     3,900,000      
Liabilities   4,100,000   4,100,000     3,900,000      
Net assets   200,000   200,000     200,000      
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution       254,100 419,600          
Net assets   1,300,000   1,300,000     1,500,000      
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries       89,000 544,600          
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution       $ 52,800 $ 45,000          
Variable interest entity, ownership percentage       12.50% 12.60%          
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries       $ 10,000 $ 32,300          
Variable Interest Entity, Primary Beneficiary | Vermeer Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Assets   1,500,000   1,500,000     1,300,000      
Liabilities   184,400   184,400     69,900      
Redeemable noncontrolling interests   1,300,000   1,300,000     1,200,000      
Variable Interest Entity, Primary Beneficiary | Fontana                    
Variable Interest Entity [Line Items]                    
Assets   615,600   615,600            
Liabilities   233,300   233,300            
Redeemable noncontrolling interests   261,500   261,500            
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Assets   663,700   663,700     650,500      
Liabilities   663,700   663,700     650,500      
Face amount                 $ 250,000  
Number of variable rate notes issued | note 2                  
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Term loans                    
Variable Interest Entity [Line Items]                    
Investment in participating notes   3,400   3,400     6,500      
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | $250 Million Principal-At-Risk Note                    
Variable Interest Entity [Line Items]                    
Face amount $ 250,000                  
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | $150 Million Principal-At-Risk Note                    
Variable Interest Entity [Line Items]                    
Face amount $ 150,000                  
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Renaissance Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       39,600 39,500          
Ceded premiums earned       29,400 22,500          
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | DaVinci Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       9,900 9,900          
Ceded premiums earned       7,300 $ 5,600          
Variable Interest Entity, Not Primary Beneficiary | Langhorne Holdings LLC                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method   2,500   2,500     2,300      
Variable Interest Entity, Not Primary Beneficiary | Langhorne Partners                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method   $ 100   $ 100     $ 100