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Variable Interest Entities (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entity [Line Items]        
Total assets $ 30,820,580,000 $ 30,820,580,000 $ 26,330,094,000  
Total liabilities 19,872,013,000 19,872,013,000 17,287,419,000  
Redeemable noncontrolling interests 3,388,319,000 3,388,319,000 3,071,308,000  
Ceded premiums written   1,709,832,000 1,426,257,000 $ 1,178,525,000
Ceded premiums earned   1,662,815,000 1,414,383,000 1,095,886,000
Reinsurance Recoverable 2,926,010,000 2,926,010,000 2,791,297,000 2,372,221,000
Investments in other ventures, under equity method (Note 5) 98,373,000 $ 98,373,000 106,549,000  
Primary Beneficiary | Upsilon RFO        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage   85.00%    
Upsilon RFO Re Ltd. | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets 3,800,000,000 $ 3,800,000,000 3,100,000,000  
Total liabilities 3,800,000,000 3,800,000,000 3,100,000,000  
Net assets 270,000,000.0 270,000,000.0    
Upsilon RFO Re Ltd. | Investor | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Payments of capital distributions   586,000,000.0 279,200,000  
Net assets 1,700,000,000 1,700,000,000    
Upsilon RFO Re Ltd. | Investor | Non-voting preference shares | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investment in variable interest entity 620,300,000 $ 835,900,000 $ 618,700,000  
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage   13.80% 16.50%  
Payments of capital distributions   $ 102,900,000 $ 31,000,000.0  
Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-voting preference shares | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investment in variable interest entity   98,100,000 100,000,000.0  
Vermeer Reinsurance Ltd.        
Variable Interest Entity [Line Items]        
Redeemable noncontrolling interests 1,109,627,000 1,109,627,000 1,003,615,000 599,989,000
Vermeer Reinsurance Ltd. | Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets 1,100,000,000 1,100,000,000 1,000,000,000.0  
Total liabilities 36,700,000 36,700,000 23,200,000  
Redeemable noncontrolling interests 1,100,000,000 1,100,000,000 1,000,000,000.0  
Mona Lisa Re | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Total assets 400,300,000 400,300,000 6,000  
Total liabilities 400,300,000 400,300,000 6,000  
Mona Lisa Re | Other Investments | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Fair value of investment 3,700,000 3,700,000    
Mona Lisa Re | Renaissance Reinsurance Ltd. | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Ceded premiums written   24,300,000 0 200,000
Ceded premiums earned   24,300,000 0 200,000
Mona Lisa Re | DaVinci Reinsurance Ltd. | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Ceded premiums written   6,700,000    
Ceded premiums earned   6,700,000 0 200,000
Fibonacci Reinsurance Ltd. | Other Investments | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Fair value of investment 0 0 400,000  
Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd. | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Ceded premiums written   200,000 100,000 9,100,000
Ceded premiums earned   200,000 100,000 10,000,000.0
Ceded net claims and claim expenses   7,500,000 7,500,000 $ 0
Reinsurance Recoverable 0 0 7,500,000  
Langhorne Holdings LLC | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments in other ventures, under equity method (Note 5) 2,000,000.0 2,000,000.0 1,700,000  
Langhorne Partners | Not Primary Beneficiary        
Variable Interest Entity [Line Items]        
Investments in other ventures, under equity method (Note 5) $ 100,000 $ 100,000 $ 100,000