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Variable Interest Entities (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]        
Total assets $ 26,330,094,000   $ 18,676,196,000  
Total liabilities 17,287,419,000   11,579,416,000  
Redeemable noncontrolling interests 3,071,308,000   2,051,700,000  
Ceded premiums written 1,426,257,000   1,178,525,000 $ 926,215,000
Ceded premiums earned 1,414,383,000   1,095,886,000 833,929,000
Reinsurance recoverable 2,791,297,000      
Investments in other ventures, under equity method (Note 5) 106,549,000   115,172,000  
Upsilon RFO Re Ltd. | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets 3,100,000,000   2,200,000,000  
Total liabilities 3,100,000,000   2,200,000,000  
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor        
Variable Interest Entity [Line Items]        
Payments of capital distributions 279,200,000      
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares        
Variable Interest Entity [Line Items]        
Investment in variable interest entity $ 618,700,000 $ 512,800,000 856,700,000  
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd.        
Variable Interest Entity [Line Items]        
Payments of capital distributions     $ 31,000,000.0  
Variable interest entity, ownership percentage 16.50%   14.00%  
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. | Non-voting preference shares        
Variable Interest Entity [Line Items]        
Investment in variable interest entity $ 100,000,000.0   $ 109,800,000  
Vermeer Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Redeemable noncontrolling interests 1,003,615,000   599,989,000 0
Vermeer Reinsurance Ltd. | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets 1,000,000,000.0   600,400,000  
Total liabilities 23,200,000   400,000  
Redeemable noncontrolling interests 1,000,000,000.0   600,000,000.0  
Mona Lisa Re | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets 6,000   41,000  
Total liabilities 6,000   41,000  
Mona Lisa Re | Not Primary Beneficiary | Renaissance Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Ceded premiums written 0   200,000 400,000
Ceded premiums earned 0   200,000 4,100,000
Mona Lisa Re | Not Primary Beneficiary | DaVinci Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Ceded premiums written 0      
Ceded premiums earned 0   200,000 $ 2,900,000
Fibonacci Reinsurance Ltd. | Not Primary Beneficiary | Other investments        
Variable Interest Entity [Line Items]        
Fair value of investment 400,000   6,000,000.0  
Renaissance Reinsurance Ltd. | Not Primary Beneficiary | Fibonacci Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Ceded premiums written 100,000   9,100,000  
Ceded premiums earned 100,000   10,000,000.0  
Ceded net claims and claim expenses 7,500,000   0  
Reinsurance recoverable 7,500,000   0  
Langhorne Holdings LLC | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments in other ventures, under equity method (Note 5) 1,700,000   1,300,000  
Langhorne Partners | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments in other ventures, under equity method (Note 5) $ 100,000   $ 100,000