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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 10, 2020
USD ($)
note
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 29, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]                    
Assets   $ 35,034,397   $ 35,034,397     $ 33,959,502      
Liabilities   24,942,941   24,942,941     23,781,168      
Redeemable noncontrolling interests   4,352,797   4,352,797     3,554,053      
Ceded premiums written   601,023 $ 581,866 1,378,770 $ 1,410,225          
Ceded premiums earned   432,440 450,626 879,044 875,525          
Investments in other ventures, under equity method   75,979   75,979     98,068      
Vermeer Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests   1,269,417 1,133,443 1,269,417 1,133,443 $ 1,246,480 1,197,782   $ 1,116,154 $ 1,109,627
Fontana                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests   268,143 $ 0 268,143 0 $ 0 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       188,100 276,000          
Net assets   1,500,000   1,500,000     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       $ 41,400 $ 24,900          
Variable interest entity, ownership percentage       12.70% 12.30%          
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   1,400,000   1,400,000     1,300,000      
Liabilities   107,600   107,600     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   520,500   520,500            
Liabilities   128,600   128,600            
Redeemable noncontrolling interests   268,100   268,100            
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re                    
Variable Interest Entity [Line Items]                    
Assets   675,400   675,400     650,500      
Liabilities   675,400   675,400     650,500      
Face amount               $ 250,000    
Number of variable rate notes issued | note 2                  
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 | Term loans                    
Variable Interest Entity [Line Items]                    
Investment in participating notes   3,500   3,500     6,500      
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Renaissance Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       25,100 25,400          
Ceded premiums earned       19,500 12,600          
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | DaVinci Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Ceded premiums written       6,200 6,300          
Ceded premiums earned       4,800 $ 3,100          
Variable Interest Entity, Not Primary Beneficiary | Langhorne Holdings LLC                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method   2,400   2,400     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