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Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Jun. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
DaVinci Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, ownership percentage 21.40% 21.90% 21.40% 21.90%
RenaissanceRe Medici Fund Ltd.        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, ownership percentage     15.70% 12.10%
DaVinciRe Holdings Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed   $ 349,200 $ 9,991 $ 274,699
Redemption of shares from redeemable noncontrolling interests     $ (1,450) 1,148
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, redemption requirement, maximum percentage of shares held     50.00%  
DaVinciRe Holdings Ltd. | High        
Noncontrolling Interest [Line Items]        
Share repurchase requests, limit     25.00%  
RenaissanceRe Medici Fund Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed     $ 137,303 236,989
Written notice period for redemption     30 days  
Redemption of shares from redeemable noncontrolling interests     $ 107,386 47,401
RenaissanceRe Medici Fund Ltd. | Vermeer Reinsurance Ltd. | Voting, Non-participating Shares        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, ownership percentage     100.00%  
Vermeer Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed     $ 45,000 $ 355,000
PFZW | Vermeer Reinsurance Ltd. | Participating, Non-voting Common Shares        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, ownership percentage     100.00%  
DaVinci Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, increase from sale of parent equity interest $ 10,000 11,600    
Third-Party Investors | DaVinciRe Holdings Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed   263,100    
RenaissanceRe Holdings Ltd. | DaVinciRe Holdings Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed   $ 86,100