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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss) $ 191,634 $ 74,389 $ 701,862 $ 25,173 $ 40,340 $ 107,944 $ 448,855 $ 353,128 $ 993,058 $ 950,267 $ 268,917
Change in net unrealized gains on investments, net of tax                 606 2,173 (1,657)
Foreign currency translation adjustments, net of tax                 (11,309) (2,679) 0
Comprehensive income                 982,355 949,761 267,260
Net income attributable to redeemable noncontrolling interests                 (230,653) (201,469) (41,553)
Comprehensive income attributable to redeemable noncontrolling interests                 (230,653) (201,469) (41,553)
Comprehensive income attributable to RenaissanceRe                 751,702 748,292 225,707
RenaissanceRe Holdings Ltd. (Parent Guarantor)                      
Condensed Financial Statements, Captions [Line Items]                      
Change in net unrealized gains on investments, net of tax                 606 2,173 (1,657)
Foreign currency translation adjustments, net of tax                 (11,309) (2,679) 0
Comprehensive income attributable to RenaissanceRe                 751,702 748,292 225,707
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor)                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 762,405 748,798 227,364
Change in net unrealized gains on investments, net of tax                 606 2,173 (1,657)
Foreign currency translation adjustments, net of tax                 (11,309)    
Comprehensive income                 751,702 748,292 225,707
Net income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive income attributable to RenaissanceRe                 751,702 748,292 225,707
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries)                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 962,165 1,045,067 349,780
Change in net unrealized gains on investments, net of tax                 0 528 0
Foreign currency translation adjustments, net of tax                 (22,072)    
Comprehensive income                 940,093 1,045,595 349,780
Net income attributable to redeemable noncontrolling interests                 (230,653) (201,469) (41,553)
Comprehensive income attributable to redeemable noncontrolling interests                 (230,653) (201,469) (41,553)
Comprehensive income attributable to RenaissanceRe                 709,440 844,126 308,227
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer)                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 (292) 40,746 (47,395)
Change in net unrealized gains on investments, net of tax                 (435) 764 (162)
Foreign currency translation adjustments, net of tax                 0    
Comprehensive income                 (727) 41,510 (47,557)
Net income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive income attributable to RenaissanceRe                 (727) 41,510 (47,557)
Consolidating Adjustments                      
Condensed Financial Statements, Captions [Line Items]                      
Net income (loss)                 (731,220) (884,344) (264,768)
Change in net unrealized gains on investments, net of tax                 435 (1,292) 322
Foreign currency translation adjustments, net of tax                 22,072    
Comprehensive income                 (708,713) (885,636) (264,446)
Net income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive income attributable to redeemable noncontrolling interests                 0 0 0
Comprehensive income attributable to RenaissanceRe                 $ (708,713) $ (885,636) $ (264,446)