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Variable Interest Entities (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]        
Assets $ 32,236,097,000   $ 30,820,580,000  
Liabilities 21,748,190,000   19,872,013,000  
Redeemable noncontrolling interests 3,409,570,000   3,388,319,000  
Ceded premiums written 828,359,000 $ 755,913,000    
Ceded premiums earned 424,899,000 370,864,000    
Reinsurance recoverable 3,160,667,000 2,765,583,000 2,926,010,000  
Investments in other ventures, under equity method 91,362,000   98,373,000  
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Assets 3,900,000,000   3,800,000,000  
Liabilities 3,900,000,000   3,800,000,000  
Net assets 2,000,000,000.0      
Upsilon RFO Re Ltd. | Third party investor | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Payments of capital distribution 145,000,000.0 81,800,000    
Net assets 300,000,000      
Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Contributions to subsidiaries 470,300,000 620,900,000    
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Payments of capital distribution $ 9,200,000 $ 29,900,000    
Variable interest entity, ownership percentage 12.80% 14.20%    
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Contributions to subsidiaries $ 32,300,000 $ 75,400,000    
Vermeer Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Redeemable noncontrolling interests 1,116,154,000 1,021,478,000 1,109,627,000 $ 1,003,615,000
Vermeer Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Assets 1,200,000,000   1,100,000,000  
Liabilities 47,500,000   36,700,000  
Redeemable noncontrolling interests 1,100,000,000   1,100,000,000  
Mona Lisa Re | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Assets 423,800,000   400,300,000  
Liabilities 423,800,000   400,300,000  
Mona Lisa Re | Other investments | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investment in participating notes 3,700,000   3,700,000  
Mona Lisa Re | Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Ceded premiums written 28,300,000 24,300,000    
Ceded premiums earned 9,500,000 24,300,000    
Mona Lisa Re | DaVinci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Ceded premiums written 6,400,000 6,700,000    
Ceded premiums earned 1,700,000 6,700,000    
Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Ceded premiums written 0 0    
Ceded premiums earned 0 0    
Ceded net claims and claim expenses 0 $ (1,100,000)    
Reinsurance recoverable 0   0  
Fibonacci Reinsurance Ltd. | Other investments | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investment in participating notes 0   0  
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments in other ventures, under equity method 2,100,000   2,000,000.0  
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments in other ventures, under equity method $ 100,000   $ 100,000