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Variable Interest Entities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 29, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Jan. 10, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]                    
Assets $ 32,726,755   $ 32,726,755       $ 30,820,580      
Liabilities 21,852,730   21,852,730       19,872,013      
Redeemable noncontrolling interests 3,656,419   3,656,419       3,388,319      
Ceded premiums written 581,866 $ 521,069 1,410,225 $ 1,276,982            
Ceded premiums earned 450,626 409,588 875,525 780,452            
Investments in other ventures, under equity method 91,938   91,938       98,373      
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Assets 4,100,000   4,100,000       3,800,000      
Liabilities 4,100,000   4,100,000       3,800,000      
Net assets 300,000   300,000              
Upsilon RFO Re Ltd. | Third party investor | Variable Interest Entity, Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Payments of capital distribution     276,000 302,000            
Net assets 2,100,000   2,100,000              
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     $ 24,900 $ 61,600            
Variable interest entity, ownership percentage     12.30% 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 1,133,443 $ 1,083,681 1,133,443 1,083,681   $ 1,116,154 1,109,627 $ 1,021,478   $ 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 76,100   76,100       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 668,900   668,900       400,300      
Liabilities 668,900   668,900       400,300      
Face amount         $ 250,000       $ 400,000  
Mona Lisa Re | Other investments | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Investment in participating notes 5,800   5,800       3,700      
Mona Lisa Re | Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Ceded premiums written     25,400 24,300            
Ceded premiums earned     12,600 12,100            
Mona Lisa Re | DaVinci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Ceded premiums written     6,300 6,700            
Ceded premiums earned     3,100 $ 3,400            
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entity [Line Items]                    
Investments in other ventures, under equity method 2,200   2,200       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