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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Jun. 29, 2021
Dec. 31, 2020
Jun. 30, 2020
Jan. 10, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]                    
Assets $ 33,536,332   $ 33,536,332       $ 30,820,580      
Liabilities 23,328,520   23,328,520       19,872,013      
Redeemable noncontrolling interests 3,458,298   3,458,298       3,388,319      
Ceded premiums written 287,740 $ 243,647 1,697,965 $ 1,520,629            
Ceded premiums earned 508,622 430,309 1,384,147 1,210,761            
Investments in other ventures, under equity method 93,344   93,344       98,373      
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Assets 4,000,000   4,000,000       3,800,000      
Liabilities 4,000,000   4,000,000       3,800,000      
Net assets 200,000   200,000              
Upsilon RFO Re Ltd. | Third party investor | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution     419,600 302,000            
Net assets 1,700,000   1,700,000              
Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries     544,600 802,000            
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution     $ 45,000 $ 61,600            
Variable interest entity, ownership percentage     12.60% 13.90%            
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Contributions to subsidiaries     $ 32,300 $ 95,400            
Vermeer Reinsurance Ltd.                    
Variable Interest Entity [Line Items]                    
Redeemable noncontrolling interests 1,130,784 $ 1,095,635 1,130,784 1,095,635 $ 1,133,443   1,109,627 $ 1,083,681   $ 1,003,615
Vermeer Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Assets 1,200,000   1,200,000       1,100,000      
Liabilities 95,900   95,900       36,700      
Redeemable noncontrolling interests 1,100,000   1,100,000       1,100,000      
Mona Lisa Re | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Assets 662,800   662,800       400,300      
Liabilities 662,800   662,800       400,300      
Face amount           $ 250,000        
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 6,000   6,000       3,700      
Mona Lisa Re | Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Ceded premiums written     39,500 24,300            
Ceded premiums earned     22,500 18,200            
Mona Lisa Re | DaVinci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Ceded premiums written     9,900 6,700            
Ceded premiums earned     5,600 $ 5,100            
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method 2,300   2,300       2,000      
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method $ 100   $ 100       $ 100