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Variable Interest Entities (Details)
$ in Thousands
 3 Months Ended
Jan. 10, 2020
USD ($)
number_of_notes
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jun. 29, 2021
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]            
Assets   $ 34,848,079   $ 33,959,502    
Liabilities   24,767,224   23,781,168    
Redeemable noncontrolling interests   3,963,895   3,554,053    
Ceded premiums written   777,747 $ 828,359      
Ceded premiums earned   446,604 424,899      
Investments in other ventures, under equity method   81,106   98,068    
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Assets   4,100,000   3,900,000    
Liabilities   4,100,000   3,900,000    
Net assets   300,000   200,000    
Upsilon RFO Re Ltd. | Third party investor | Variable Interest Entity, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Payments of capital distribution   22,900 145,000      
Net assets   1,600,000   1,500,000    
Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Contributions to subsidiaries   $ 89,000 470,300      
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Payments of capital distribution     $ 9,200      
Variable interest entity, ownership percentage   13.80% 12.80%      
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Contributions to subsidiaries   $ 10,000 $ 32,300      
Vermeer Reinsurance Ltd.            
Variable Interest Entity [Line Items]            
Redeemable noncontrolling interests   1,246,480 1,116,154 1,197,782   $ 1,109,627
Vermeer Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary            
Variable Interest Entity [Line Items]            
Assets   1,300,000   1,300,000    
Liabilities   71,700   69,900    
Redeemable noncontrolling interests   1,200,000   1,200,000    
Mona Lisa Re | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Assets   687,500   650,500    
Liabilities   687,500   650,500    
Face amount         $ 250,000  
Number of variable rate notes issued | number_of_notes 2          
Mona Lisa Re | Variable Interest Entity, Not Primary Beneficiary | $250 Million Principal-At-Risk Note            
Variable Interest Entity [Line Items]            
Face amount $ 250,000          
Mona Lisa Re | Variable Interest Entity, Not Primary Beneficiary | $150 Million Principal-At-Risk Note            
Variable Interest Entity [Line Items]            
Face amount $ 150,000          
Mona Lisa Re | Other investments | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Investment in participating notes   5,000   6,500    
Mona Lisa Re | Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Ceded premiums written   25,100 28,300      
Ceded premiums earned   9,700 9,500      
Mona Lisa Re | DaVinci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Ceded premiums written   6,200 6,400      
Ceded premiums earned   2,400 $ 1,700      
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Investments in other ventures, under equity method   2,400   2,300    
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Investments in other ventures, under equity method   $ 100   $ 100