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Noncontrolling Interests (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Jan. 01, 2017
Jan. 01, 2016
Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interests     $ 1,187,991   $ 1,175,594      
Net income attributable to redeemable noncontrolling interests     34,327 $ 44,591        
DaVinciRe Holdings Ltd.                
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interests     986,646 926,141 $ 994,458     $ 930,955
Net income attributable to redeemable noncontrolling interests     $ 31,909 42,964        
Parent company ownership in redeemable noncontrolling interest     22.60%   24.00%      
Sale of shares to redeemable noncontrolling interest     $ 23,921 43,040        
Redemption of shares from redeemable noncontrolling interest     $ 63,642 90,818        
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest                
Redeemable Noncontrolling Interest [Line Items]                
Parent company ownership in redeemable noncontrolling interest           22.60% 24.00%  
Redeemable noncontrolling interest, net redemptions   $ 100,000            
Redeemable noncontrolling interest, reserve holdback $ 7,500 $ 10,000            
Noncontrolling interest, decrease from redemptions 75,000              
Noncontrolling interest, decrease from purchase of interests $ 24,000              
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest | High                
Redeemable Noncontrolling Interest [Line Items]                
Share repurchase requests, limit     25.00%          
RenaissanceRe Medici Fund Ltd.                
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interests     $ 201,345 155,196 $ 181,136     $ 115,009
Net income attributable to redeemable noncontrolling interests     $ 2,418 1,627        
Parent company ownership in redeemable noncontrolling interest     34.40%   36.50%      
Redemption provision, notice period     30 days          
Sale of shares to redeemable noncontrolling interest     $ 28,416 39,500 $ 79,500      
Redemption of shares from redeemable noncontrolling interest     $ 10,625 $ 940 $ 21,700