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Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 01, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
DaVinci Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, ownership percentage 21.90% 22.10% 21.90% 22.10%
Noncontrolling interest, increase from sale of parent equity interest $ 11,600      
RenaissanceRe Medici Fund Ltd.        
Noncontrolling Interest [Line Items]        
Redeemable noncontrolling interest, ownership percentage   16.60% 12.10% 16.60%
DaVinciRe Holdings Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed 349,200   $ 274,699 $ 0
Redemption of shares from redeemable noncontrolling interests     $ 1,148 4,351
DaVinciRe Holdings Ltd. | High        
Noncontrolling Interest [Line Items]        
Share repurchase requests, limit     25.00%  
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest        
Noncontrolling Interest [Line Items]        
Share repurchase requests, percent of aggregate shares, limit     50.00%  
RenaissanceRe Medici Fund Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed     $ 236,989 208,482
Written notice period for redemption     30 days  
Redemption of shares from redeemable noncontrolling interests     $ 47,401 90,490
Vermeer Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed     $ 355,000 $ 600,000
Participating, Non-voting Common Shares | Vermeer Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed   $ 600,000    
Voting, Non-participating Shares | Vermeer Reinsurance Ltd.        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, value subscribed   $ 1    
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