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Variable Interest Entities (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 29, 2021
Jan. 10, 2020
Variable Interest Entity [Line Items]          
Total assets $ 33,959,502,000 $ 30,820,580,000      
Total liabilities 23,781,168,000 19,872,013,000      
Redeemable noncontrolling interests 3,554,053,000 3,388,319,000      
Ceded premiums written 1,894,423,000 1,709,832,000 $ 1,426,257,000    
Ceded premiums earned 1,863,350,000 1,662,815,000 1,414,383,000    
Investments in other ventures, under equity method (Note 5) 98,068,000 98,373,000      
Vermeer Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Redeemable noncontrolling interests 1,197,782,000 1,109,627,000 1,003,615,000    
Primary Beneficiary | Upsilon RFO Re Ltd.          
Variable Interest Entity [Line Items]          
Total assets 3,900,000,000 3,800,000,000      
Total liabilities 3,900,000,000 3,800,000,000      
Net assets 238,000,000 270,000,000      
Primary Beneficiary | Upsilon RFO Re Ltd. | Investor          
Variable Interest Entity [Line Items]          
Payments of capital distributions 571,900,000 586,000,000      
Net assets 1,500,000,000 1,700,000,000      
Primary Beneficiary | Upsilon RFO Re Ltd. | Investor | Non-voting preference shares          
Variable Interest Entity [Line Items]          
Investment in variable interest entity 544,600,000 835,900,000      
Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.          
Variable Interest Entity [Line Items]          
Payments of capital distributions $ 45,000,000 $ 102,900,000      
Variable interest entity, ownership percentage 13.70% 13.80%      
Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd. | Non-voting preference shares          
Variable Interest Entity [Line Items]          
Investment in variable interest entity $ 32,300,000 $ 98,100,000      
Primary Beneficiary | Vermeer Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Total assets 1,300,000,000 1,100,000,000      
Total liabilities 69,900,000 36,700,000      
Redeemable noncontrolling interests 1,200,000,000 1,100,000,000      
Not Primary Beneficiary | Mona Lisa Re          
Variable Interest Entity [Line Items]          
Total assets 650,500,000 400,300,000      
Total liabilities 650,500,000 400,300,000      
Face amount       $ 250,000,000  
Not Primary Beneficiary | Mona Lisa Re | $250 Million Principal-At-Risk Note          
Variable Interest Entity [Line Items]          
Face amount         $ 250,000,000
Not Primary Beneficiary | Mona Lisa Re | $150 Million Principal-At-Risk Note          
Variable Interest Entity [Line Items]          
Face amount         $ 150,000,000
Not Primary Beneficiary | Mona Lisa Re | Other Investments          
Variable Interest Entity [Line Items]          
Fair value of investment 6,500,000 3,700,000      
Not Primary Beneficiary | Mona Lisa Re | Renaissance Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Ceded premiums written 39,500,000 24,300,000 0    
Ceded premiums earned 32,500,000 24,300,000 0    
Not Primary Beneficiary | Mona Lisa Re | DaVinci Reinsurance Ltd.          
Variable Interest Entity [Line Items]          
Ceded premiums written 9,900,000 6,700,000      
Ceded premiums earned 8,100,000 6,700,000 $ 0    
Not Primary Beneficiary | Langhorne Holdings LLC          
Variable Interest Entity [Line Items]          
Investments in other ventures, under equity method (Note 5) 2,300,000 2,000,000      
Not Primary Beneficiary | Langhorne Partners          
Variable Interest Entity [Line Items]          
Investments in other ventures, under equity method (Note 5) $ 100,000 $ 100,000