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Condensed Consolidating Financial Information Provided in Connection with Outstanding Debt of Subsidiaries (Condensed Consolidating Statement of Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 40,340 | $ 107,944 | $ 448,855 | $ 353,128 | $ (123,986) | $ 48,829 | $ 251,867 | $ 92,207 | $ 950,267 | $ 268,917 | $ (354,671) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 2,173 | (1,657) | (909) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | (2,679) | 0 | 0 |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 949,761 | 267,260 | (355,580) |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (201,469) | (41,553) | 132,282 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (201,469) | (41,553) | 132,282 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 748,292 | 225,707 | (223,298) |
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 2,173 | (1,657) | (909) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | (2,679) | 0 |  | $ 0
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 748,292 | 225,707 | (223,298) |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 748,292 | 225,707 | (223,298) |
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 748,798 | 227,364 | (222,389) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 2,173 | (1,657) | (909) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | (2,679) |  |  |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 748,292 | 225,707 | (223,298) |
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 1,020,509 | 349,780 | (285,838) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | 0 |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 1,020,509 | 349,780 | (285,838) |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (201,469) | (41,553) | 132,282 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | (201,469) | (41,553) | 132,282 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 819,040 | 308,227 | (153,556) |
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 24,558 | 3,936 | (5,926) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 528 | (160) | (89) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | 0 |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 25,086 | 3,776 | (6,015) |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 25,086 | 3,776 | (6,015) |
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 30,596 |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  |  |  | 0 |
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  | 30,596 |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  | 0 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  |  |  | 30,596 |
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 40,746 | (47,395) | (38,871) |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | 764 | (162) | (89) |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | 0 |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 41,510 | (47,557) | (38,960) |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | 41,510 | (47,557) | (38,960) |
Consolidating Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (884,344) | (264,768) | 167,757 |
Change in net unrealized gains on investments, net of tax |  |  |  |  |  |  |  |  | (1,292) | 322 | 178 |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | 0 |  |  |
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (885,636) | (264,446) | 167,935 |
Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive loss attributable to redeemable noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Comprehensive income (loss) attributable to RenaissanceRe |  |  |  |  |  |  |  |  | $ (885,636) | $ (264,446) | $ 167,935 |

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