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Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Oct. 01, 2017
Jul. 31, 2017
Jan. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jul. 01, 2017
Jan. 01, 2017
Noncontrolling Interest [Line Items]              
Noncontrolling interest, value subscribed       $ 1      
DaVinci Reinsurance Ltd.              
Noncontrolling Interest [Line Items]              
Redeemable noncontrolling interest, ownership percentage 22.10%     22.10% 22.10% 23.50% 22.60%
RenaissanceRe Medici Fund Ltd.              
Noncontrolling Interest [Line Items]              
Redeemable noncontrolling interest, ownership percentage       16.60% 26.80%    
DaVinciRe Holdings Ltd.              
Noncontrolling Interest [Line Items]              
Redeemable noncontrolling interest, net redemptions     $ 75,000        
Redeemable noncontrolling interest, reserve holdback     7,500        
Redeemable noncontrolling interest, sale of interest $ 49,700 $ 12,000 $ 24,000        
Non-voting preference shares issued to third parties $ 248,600            
Noncontrolling interest, value subscribed       $ 0 $ 232,119    
Redemption of shares from redeemable noncontrolling interests       $ 4,351 80,058    
DaVinciRe Holdings Ltd. | Maximum              
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]              
Written notice period for redemption       30 days      
Noncontrolling interest, value subscribed       $ 208,482 149,182    
Redemption of shares from redeemable noncontrolling interests       90,490 48,049    
Vermeer Reinsurance Ltd.              
Noncontrolling Interest [Line Items]              
Noncontrolling interest, value subscribed       $ 600,000 $ 0