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Variable Interest Entities (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 30, 2020
Jan. 10, 2020
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]                  
Assets $ 30,995,840,000   $ 30,995,840,000   $ 26,330,094,000        
Liabilities 20,217,702,000   20,217,702,000   17,287,419,000        
Redeemable noncontrolling interests 3,387,317,000   3,387,317,000   3,071,308,000        
Ceded premiums written 243,647,000 $ 156,938,000 1,520,629,000 $ 1,246,145,000          
Ceded premiums earned 430,309,000 343,529,000 1,210,761,000 1,030,028,000          
Reinsurance recoverable 2,883,808,000 2,438,299,000 2,883,808,000 2,438,299,000 2,791,297,000        
Investments in other ventures, under equity method 98,990,000   98,990,000   106,549,000        
Vermeer Reinsurance Ltd.                  
Variable Interest Entity [Line Items]                  
Redeemable noncontrolling interests 1,095,635,000 $ 781,738,000 1,095,635,000 781,738,000 1,003,615,000 $ 1,083,681,000   $ 765,450,000 $ 599,989,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.                  
Variable Interest Entity [Line Items]                  
Assets 3,500,000,000   3,500,000,000   3,100,000,000        
Liabilities 3,500,000,000   3,500,000,000   3,100,000,000        
Net assets 291,000,000.0   291,000,000.0            
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor                  
Variable Interest Entity [Line Items]                  
Payments of capital distribution     302,000,000.0   279,200,000        
Net assets 1,800,000,000   1,800,000,000            
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares                  
Variable Interest Entity [Line Items]                  
Contributions to subsidiaries     802,000,000.0   618,700,000        
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.                  
Variable Interest Entity [Line Items]                  
Payments of capital distribution     $ 61,600,000   $ 31,000,000.0        
Variable interest entity, ownership percentage     13.90%   16.50%        
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-Voting Preference Shares                  
Variable Interest Entity [Line Items]                  
Contributions to subsidiaries     $ 95,400,000   $ 100,000,000.0        
Variable Interest Entity, Primary Beneficiary | Vermeer Reinsurance Ltd.                  
Variable Interest Entity [Line Items]                  
Assets 1,300,000,000   1,300,000,000   1,000,000,000.0        
Liabilities 250,100,000   250,100,000   23,200,000        
Redeemable noncontrolling interests 1,100,000,000   1,100,000,000   1,000,000,000.0        
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re                  
Variable Interest Entity [Line Items]                  
Assets 408,100,000   408,100,000   6,000        
Liabilities 408,100,000   408,100,000   6,000        
Face amount             $ 400,000,000.0    
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Other investments                  
Variable Interest Entity [Line Items]                  
Investment in participating notes 2,800,000   2,800,000            
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | Renaissance Reinsurance Ltd.                  
Variable Interest Entity [Line Items]                  
Ceded premiums written     24,300,000 0          
Ceded premiums earned     18,200,000 0          
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re | DaVinci Reinsurance Ltd.                  
Variable Interest Entity [Line Items]                  
Ceded premiums written     6,700,000 0          
Ceded premiums earned     5,100,000 0          
Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd.                  
Variable Interest Entity [Line Items]                  
Ceded premiums written     11,000 100,000          
Ceded premiums earned     11,000 100,000          
Ceded net claims and claim expenses     7,500,000 $ 7,500,000          
Reinsurance recoverable 0   0   7,500,000        
Variable Interest Entity, Not Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other investments                  
Variable Interest Entity [Line Items]                  
Investment in participating notes 1,000,000.0   1,000,000.0   400,000        
Variable Interest Entity, Not Primary Beneficiary | Langhorne Holdings LLC                  
Variable Interest Entity [Line Items]                  
Investments in other ventures, under equity method 2,000,000.0   2,000,000.0   1,700,000        
Variable Interest Entity, Not Primary Beneficiary | Langhorne Partners                  
Variable Interest Entity [Line Items]                  
Investments in other ventures, under equity method $ 100,000   $ 100,000   $ 100,000