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Noncontrolling Interests (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 01, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests   $ 2,779,033 $ 2,051,700   $ 2,779,033        
Net income attributable to redeemable noncontrolling interests   $ 62,057   $ 6,440 $ 204,091 $ 90,822      
DaVinci Reinsurance Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Parent company ownership in redeemable noncontrolling interest 21.90% 21.90% 22.10%   21.90%        
Sale of equity interest $ 11,600                
RenaissanceRe Medici Fund Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Parent company ownership in redeemable noncontrolling interest   13.70% 15.80%   13.70%        
DaVinciRe Holdings Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests   $ 1,462,677 $ 1,034,946 1,085,985 $ 1,462,677 1,085,985 $ 1,431,101 $ 1,082,425 $ 1,011,659
Net income attributable to redeemable noncontrolling interests   30,558   3,730 152,946 74,935      
Sale of shares to redeemable noncontrolling interest 349,200 0   0 274,699 0      
Redemption of shares from redeemable noncontrolling interest   $ (1,018)   170 $ (86) 609      
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   $ 534,618 416,765 447,993 $ 534,618 447,993 515,915 411,003 284,847
Net income attributable to redeemable noncontrolling interests   15,211   2,710 19,396 15,887      
Sale of shares to redeemable noncontrolling interest   10,500   43,000 $ 142,905 199,482      
Redemption provision, notice period         30 days        
Redemption of shares from redeemable noncontrolling interest   7,008   8,720 $ 44,448 52,223      
Vermeer Reinsurance Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable noncontrolling interests   781,738 599,989 0 781,738 0 $ 765,450 $ 0 $ 0
Net income attributable to redeemable noncontrolling interests   16,288   0 31,749 0      
Sale of shares to redeemable noncontrolling interest   $ 0   $ 0 150,000 $ 0      
Participating, Non-voting Common Shares | Vermeer Reinsurance Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Sale of shares to redeemable noncontrolling interest     600,000   $ 150,000        
Voting, Non-participating Shares | Vermeer Reinsurance Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Sale of shares to redeemable noncontrolling interest     $ 1            
Third-Party Investors | DaVinciRe Holdings Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Sale of shares to redeemable noncontrolling interest 263,100                
RenaissanceRe Holdings Ltd. | DaVinciRe Holdings Ltd.                  
Redeemable Noncontrolling Interest [Line Items]                  
Sale of shares to redeemable noncontrolling interest $ 86,100