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Condensed Consolidating Financial Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | $ 1,045,787 | $ 484,772 | $ 424,985 |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 9,490,669 | 8,102,514 | 9,481,742 |
Purchases of fixed maturity investments trading | (10,093,532) | (8,282,720) | (9,683,068) |
Proceeds from sales and maturities of fixed maturity investments available for sale | 0 | 17,692 | 8,688 |
Net (purchases) sales of equity investments trading | 115,837 | 184,788 | (147,558) |
Net (purchases) sales of short term investments | 364,011 | (118,617) | 669,116 |
Net (purchases) sales of other investments | (19,419) | (68,589) | 15,843 |
Net purchases of investments in other ventures | 0 | 0 | (10,150) |
Net sales of other assets | 0 | 400 | 4,500 |
Dividends and return of capital from subsidiaries | 0 | 0 | 0 |
Contributions to subsidiaries | 0 | 0 | 0 |
Due to (from) subsidiaries | 0 | 0 | 0 |
Net purchase of Platinum | 0 | 0 | (678,152) |
Net cash used in investing activities | (142,434) | (164,532) | (339,039) |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | (51,370) | (51,583) | (53,967) |
Dividends paid – preference shares | (22,381) | (22,381) | (22,381) |
RenaissanceRe common share repurchases | (188,591) | (309,434) | (259,874) |
Issuance of debt | 295,866 | 0 | 445,589 |
Repayment of debt | (250,000) | 0 |  | $ 0
Net repayment of debt |  |  |  | 445,589
Net third party redeemable noncontrolling interest share transactions | 260,475 | (2,990) | (193,032) |
Taxes paid on withholding shares | (15,139) | (14,943) | (10,248) |
Net cash provided by (used in) financing activities | 28,860 | (401,331) | (93,913) |
Effect of exchange rate changes on foreign currency cash | 8,222 | (4,637) | (10,732) |
Net increase (decrease) in cash and cash equivalents | 940,435 | (85,728) | (18,699) |
Cash and cash equivalents, beginning of period | 421,157 | 506,885 | 525,584 |
Cash and cash equivalents, end of period | 1,361,592 | 421,157 | 506,885 |
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | (4,109) | (3,509) | (28,965) |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 261,601 | 314,568 | 63,824 |
Purchases of fixed maturity investments trading | (344,463) | (336,345) | (161,183) |
Net (purchases) sales of short term investments | 243,571 | (111,814) | (116,461) |
Dividends and return of capital from subsidiaries | 478,496 | 617,239 | 1,584,624 |
Net purchase of Platinum | 0 | 0 | (904,433) |
Net cash used in investing activities | 289,179 | 398,732 | 379,634 |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | (51,370) | (51,583) | (53,967) |
Dividends paid – preference shares | (22,381) | (22,381) | (22,381) |
RenaissanceRe common share repurchases | (188,591) | (309,434) | (259,874) |
Repayment of debt | 0 |  |  |
Net repayment of debt |  |  |  | 0
Taxes paid on withholding shares | (15,139) | (14,943) | (10,248) |
Net cash provided by (used in) financing activities | (277,481) | (398,341) | (346,470) |
Net increase (decrease) in cash and cash equivalents | 7,589 | (3,118) | 4,199 |
Cash and cash equivalents, beginning of period | 7,067 | 10,185 | 5,986 |
Cash and cash equivalents, end of period | 14,656 | 7,067 | 10,185 |
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Cash flows used in financing activities |  |  |  |
Repayment of debt | 0 |  |  |
Net repayment of debt |  |  |  | 146,189
RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Cash flows used in financing activities |  |  |  |
Repayment of debt | 0 |  |  |
Net repayment of debt |  |  |  | $ 0
Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |
Cash flows used in financing activities |  |  |  |
Repayment of debt | (250,000) |  |  |
RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |
Cash flows used in financing activities |  |  |  |
Repayment of debt | 0 |  |  |
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | (4,109) | (3,509) | (28,965) |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 261,601 | 314,568 | 63,824 |
Purchases of fixed maturity investments trading | (344,463) | (336,345) | (161,183) |
Proceeds from sales and maturities of fixed maturity investments available for sale |  | 0 | 0 |
Net (purchases) sales of equity investments trading | 0 | 0 | 0 |
Net (purchases) sales of short term investments | 243,571 | (111,814) | (116,461) |
Net (purchases) sales of other investments | 0 | 0 | 0 |
Net purchases of investments in other ventures |  | 0 | 0 |
Net sales of other assets |  | 0 | 0 |
Dividends and return of capital from subsidiaries | 478,496 | 617,239 | 1,584,624 |
Contributions to subsidiaries | (669,672) | (108,674) | (294,733) |
Due to (from) subsidiaries | 319,646 | 23,758 | 207,996 |
Net purchase of Platinum |  |  | (904,433) |
Net cash used in investing activities | 289,179 | 398,732 | 379,634 |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | (51,370) | (51,583) | (53,967) |
Dividends paid – preference shares | (22,381) | (22,381) | (22,381) |
RenaissanceRe common share repurchases | (188,591) | (309,434) | (259,874) |
Issuance of debt | 0 |  |  |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 | 0 |
Taxes paid on withholding shares | (15,139) | (14,943) | (10,248) |
Net cash provided by (used in) financing activities | (277,481) | (398,341) | (346,470) |
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | 7,589 | (3,118) | 4,199 |
Cash and cash equivalents, beginning of period | 7,067 | 10,185 | 5,986 |
Cash and cash equivalents, end of period | 14,656 | 7,067 | 10,185 |
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | 1,408,311 | 535,912 | 487,852 |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 8,550,179 | 7,572,923 | 9,323,024 |
Purchases of fixed maturity investments trading | (9,229,732) | (7,532,276) | (9,462,845) |
Proceeds from sales and maturities of fixed maturity investments available for sale |  | 17,692 | 8,688 |
Net (purchases) sales of equity investments trading | 32,265 | (5,845) | 87,993 |
Net (purchases) sales of short term investments | 79,520 | (41,586) | 610,705 |
Net (purchases) sales of other investments | (19,419) | (68,589) | 15,843 |
Net purchases of investments in other ventures |  | 0 | (10,150) |
Net sales of other assets |  | 400 | 4,500 |
Dividends and return of capital from subsidiaries | (529,537) | (633,264) | (1,917,177) |
Contributions to subsidiaries | 706,211 | 108,674 | 555,036 |
Due to (from) subsidiaries | (319,027) | (31,566) | 93,809 |
Net purchase of Platinum |  |  | 224,744 |
Net cash used in investing activities | (729,540) | (613,437) | (465,830) |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0 |
Dividends paid – preference shares | 0 | 0 | 0 |
RenaissanceRe common share repurchases | 0 | 0 | 0 |
Issuance of debt | 0 |  |  |
Net third party redeemable noncontrolling interest share transactions | 260,475 | (2,990) | (193,032) |
Taxes paid on withholding shares | 0 | 0 | 0 |
Net cash provided by (used in) financing activities | 260,475 | (2,990) | (46,843) |
Effect of exchange rate changes on foreign currency cash | 8,222 | (4,637) | (10,732) |
Net increase (decrease) in cash and cash equivalents | 947,468 | (85,152) | (35,553) |
Cash and cash equivalents, beginning of period | 397,860 | 483,012 | 518,565 |
Cash and cash equivalents, end of period | 1,345,328 | 397,860 | 483,012 |
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | (8,253) | 1,477 | (9,201) |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 100,248 | 69,941 | 49,807 |
Purchases of fixed maturity investments trading | (99,568) | (123,046) | (59,040) |
Proceeds from sales and maturities of fixed maturity investments available for sale |  | 0 | 0 |
Net (purchases) sales of equity investments trading | (1,752) | (2,389) | 33,693 |
Net (purchases) sales of short term investments | 114 | 67,684 | (63,305) |
Net (purchases) sales of other investments | 0 | 0 | 0 |
Net purchases of investments in other ventures |  | 0 | 0 |
Net sales of other assets |  | 0 | 0 |
Dividends and return of capital from subsidiaries | 9,175 | 2,900 | 180,000 |
Contributions to subsidiaries | 0 | 0 | (8,550) |
Due to (from) subsidiaries | 13 | (22,313) | (118,529) |
Net purchase of Platinum |  |  | 0 |
Net cash used in investing activities | 8,230 | (7,223) | 14,076 |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0 |
Dividends paid – preference shares | 0 | 0 | 0 |
RenaissanceRe common share repurchases | 0 | 0 | 0 |
Issuance of debt | 0 |  |  |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 | 0 |
Taxes paid on withholding shares | 0 | 0 | 0 |
Net cash provided by (used in) financing activities | 0 | 0 | 0 |
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | (23) | (5,746) | 4,875 |
Cash and cash equivalents, beginning of period | 162 | 5,908 | 1,033 |
Cash and cash equivalents, end of period | 139 | 162 | 5,908 |
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | (2,272) | (14,501) | (6,830) |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 289,741 | 145,082 | 45,087 |
Purchases of fixed maturity investments trading | (143,991) | (291,053) | 0 |
Proceeds from sales and maturities of fixed maturity investments available for sale |  | 0 | 0 |
Net (purchases) sales of equity investments trading | 85,324 | 193,022 | (269,244) |
Net (purchases) sales of short term investments | 41,299 | (32,901) | 238,177 |
Net (purchases) sales of other investments | 0 | 0 | 0 |
Net purchases of investments in other ventures |  | 0 | 0 |
Net sales of other assets |  | 0 | 0 |
Dividends and return of capital from subsidiaries | 0 | 0 | 65,000 |
Contributions to subsidiaries | (26,649) | 0 | (66,753) |
Due to (from) subsidiaries | (123) | (81) | 129 |
Net purchase of Platinum |  |  | 1,537 |
Net cash used in investing activities | 245,601 | 14,069 | 13,933 |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0 |
Dividends paid – preference shares | 0 | 0 | 0 |
RenaissanceRe common share repurchases | 0 | 0 | 0 |
Issuance of debt | 0 |  |  |
Net repayment of debt |  |  | 0 |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 | 0 |
Taxes paid on withholding shares | 0 | 0 | 0 |
Net cash provided by (used in) financing activities | (250,000) | 0 | 0 |
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | (6,671) | (432) | 7,103 |
Cash and cash equivalents, beginning of period | 6,671 | 7,103 | 0 |
Cash and cash equivalents, end of period | 0 | 6,671 | 7,103 |
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |  |
Cash flows (used in) provided by operating activities |  |  |  |
Net cash provided by operating activities | (347,890) | (34,607) | (17,871) |
Cash flows provided by (used in) investing activities |  |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 288,900 | 0 | 0 |
Purchases of fixed maturity investments trading | (275,778) | 0 | 0 |
Proceeds from sales and maturities of fixed maturity investments available for sale |  | 0 | 0 |
Net (purchases) sales of equity investments trading | 0 | 0 | 0 |
Net (purchases) sales of short term investments | (493) | 0 | 0 |
Net (purchases) sales of other investments | 0 | 0 | 0 |
Net purchases of investments in other ventures |  | 0 | 0 |
Net sales of other assets |  | 0 | 0 |
Dividends and return of capital from subsidiaries | 41,866 | 13,125 | 87,553 |
Contributions to subsidiaries | (9,890) | 0 | (185,000) |
Due to (from) subsidiaries | (509) | 30,202 | (183,405) |
Net purchase of Platinum |  |  | 0 |
Net cash used in investing activities | 44,096 | 43,327 | (280,852) |
Cash flows used in financing activities |  |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0 |
Dividends paid – preference shares | 0 | 0 | 0 |
RenaissanceRe common share repurchases | 0 | 0 | 0 |
Issuance of debt | 295,866 |  |  |
Net repayment of debt |  |  | 299,400 |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 | 0 |
Taxes paid on withholding shares | 0 | 0 | 0 |
Net cash provided by (used in) financing activities | 295,866 | 0 | 299,400 |
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | (7,928) | 8,720 | 677 |
Cash and cash equivalents, beginning of period | 9,397 | 677 | 0 |
Cash and cash equivalents, end of period | $ 1,469 | $ 9,397 | $ 677 |

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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow to acquire securities classified as trading securities and held for investment purposes. Excludes payments for trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition Amount of cash inflow (outflow) from sales and purchases of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition The cash inflow associated with the sale, maturities, repayments and calls of securities classified as trading securities and held for investment purposes. Excludes proceeds from trading securities purchased and held principally for the purpose of selling them in the near term (thus held for only a short period of time). + References No definition available. + Details
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