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Noncontrolling Interests (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 01, 2017
Jul. 31, 2017
Jan. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Mar. 31, 2018
Jul. 01, 2017
Mar. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Redeemable Noncontrolling Interest [Line Items]                          
Redeemable noncontrolling interests       $ 1,493,428   $ 1,493,428   $ 1,296,506          
Net income attributable to redeemable noncontrolling interests       54,483 $ 37,612 84,382 $ 71,939            
DaVinciRe Holdings Ltd.                          
Redeemable Noncontrolling Interest [Line Items]                          
Redeemable noncontrolling interests       1,082,425 1,019,918 1,082,425 1,019,918 $ 1,011,659 $ 1,032,543   $ 986,646   $ 994,458
Net income attributable to redeemable noncontrolling interests       $ 50,252 36,432 $ 71,205 68,341            
Parent company ownership in redeemable noncontrolling interest 22.10%     22.10%   22.10%   22.10%   23.50%   22.60%  
Redeemable noncontrolling interest, net redemptions     $ 75,000                    
Redeemable noncontrolling interest, reserve holdback     7,500                    
Noncontrolling interest, change from purchase or sale of interests $ 49,700 $ 12,000 $ 24,000                    
Issuance of equity to third party investors $ 248,600                        
Sale of shares to redeemable noncontrolling interest       $ 0 0 $ 0 23,921            
Redemption of shares from redeemable noncontrolling interest       $ 370 3,160 $ 439 66,802            
DaVinciRe Holdings Ltd. | Maximum                          
Redeemable Noncontrolling Interest [Line Items]                          
Share repurchase requests, limit       25.00%   25.00%              
RenaissanceRe Medici Fund Ltd.                          
Redeemable Noncontrolling Interest [Line Items]                          
Redeemable noncontrolling interests       $ 411,003 222,165 $ 411,003 222,165 $ 284,847 $ 392,821   $ 201,345   $ 181,136
Net income attributable to redeemable noncontrolling interests       $ 4,231 1,180 $ 13,177 3,598            
Parent company ownership in redeemable noncontrolling interest       16.80%   16.80%   26.80%          
Redemption provision, notice period           30 days              
Sale of shares to redeemable noncontrolling interest       $ 56,743 34,925 $ 156,482 63,341 $ 149,200          
Redemption of shares from redeemable noncontrolling interest       $ 42,792 $ 15,285 $ 43,503 $ 25,910 $ 48,000