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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)

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