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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | $ 469,829 | $ 414,737 | $ 660,657
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 8,102,514 | 9,481,742 | 7,682,573
Purchases of fixed maturity investments trading | (8,282,720) | (9,683,068) | (7,639,178)
Proceeds from sales and maturities of fixed maturity investments available for sale | 17,692 | 8,688 | 7,088
Net (purchases) sales of equity investments trading | 184,788 | (147,558) | (20,003)
Net (purchases) sales of short term investments | (118,617) | 669,116 | 45,023
Net (purchases) sales of other investments | (68,589) | 15,843 | 59,120
Net purchases of investments in other ventures | 0 | (10,150) | 1,030
Net sales of other assets | 400 | 4,500 | 6,000
Dividends and return of capital from subsidiaries | 0 | 0 | 0
Contributions to subsidiaries | 0 | 0 | 0
Due (from) to subsidiary | 0 | 0 | 0
Net purchase of Platinum | 0 | (678,152) | 0
Net cash (used in) provided by investing activities | (164,532) | (339,039) | 141,653
Cash flows (used in) provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (51,583) | (53,967) | (45,912)
Dividends paid – preference shares | (22,381) | (22,381) | (22,381)
RenaissanceRe common share repurchases | (309,434) | (259,874) | (514,678)
Issuance of debt | 0 | 445,589 | 0
Net third party redeemable noncontrolling interest share transactions | (2,990) | (193,032) | (111,707)
Net cash used in financing activities | (386,388) | (83,665) | (694,678)
Effect of exchange rate changes on foreign currency cash | (4,637) | (10,732) | 9,920
Net (decrease) increase in cash and cash equivalents | (85,728) | (18,699) | 117,552
Cash and cash equivalents, beginning of period | 506,885 | 525,584 | 408,032
Cash and cash equivalents, end of period | 421,157 | 506,885 | 525,584
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | (18,452) | (39,213) | 429
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 314,568 | 63,824 | 88,273
Purchases of fixed maturity investments trading | (336,345) | (161,183) | (88,341)
Net (purchases) sales of short term investments | (111,814) | (116,461) | 73,717
Dividends and return of capital from subsidiaries | 617,239 | 1,584,624 | 1,259,224
Contributions to subsidiaries | (108,674) | (294,733) | (759,456)
Net purchase of Platinum | 0 | (904,433) | 0
Net cash (used in) provided by investing activities | 398,732 | 379,634 | 579,732
Cash flows (used in) provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (51,583) | (53,967) | (45,912)
Dividends paid – preference shares | (22,381) | (22,381) | (22,381)
RenaissanceRe common share repurchases | (309,434) | (259,874) | (514,678)
Net cash used in financing activities | (383,398) | (336,222) | (582,971)
Net (decrease) increase in cash and cash equivalents | (3,118) | 4,199 | (2,810)
Cash and cash equivalents, beginning of period | 10,185 | 5,986 | 8,796
Cash and cash equivalents, end of period | 7,067 | 10,185 | 5,986
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | (18,452) | (39,213) | 429
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 314,568 | 63,824 | 88,273
Purchases of fixed maturity investments trading | (336,345) | (161,183) | (88,341)
Proceeds from sales and maturities of fixed maturity investments available for sale | 0 | 0 | 0
Net (purchases) sales of equity investments trading | 0 | 0 | 0
Net (purchases) sales of short term investments | (111,814) | (116,461) | 73,717
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 | 0
Dividends and return of capital from subsidiaries | 617,239 | 1,584,624 | 1,259,224
Contributions to subsidiaries | (108,674) | (294,733) | (759,456)
Due (from) to subsidiary | 23,758 | 207,996 | 6,315
Net purchase of Platinum |  | (904,433) |
Net cash (used in) provided by investing activities | 398,732 | 379,634 | 579,732
Cash flows (used in) provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (51,583) | (53,967) | (45,912)
Dividends paid – preference shares | (22,381) | (22,381) | (22,381)
RenaissanceRe common share repurchases | (309,434) | (259,874) | (514,678)
Issuance of debt |  | 0 |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 | 0
Net cash used in financing activities | (383,398) | (336,222) | (582,971)
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0
Net (decrease) increase in cash and cash equivalents | (3,118) | 4,199 | (2,810)
Cash and cash equivalents, beginning of period | 10,185 | 5,986 | 8,796
Cash and cash equivalents, end of period | 7,067 | 10,185 | 5,986
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | 1,477 | (9,201) | (18,114)
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 69,941 | 49,807 | 20,487
Purchases of fixed maturity investments trading | (123,046) | (59,040) | (14,969)
Proceeds from sales and maturities of fixed maturity investments available for sale | 0 | 0 | 0
Net (purchases) sales of equity investments trading | (2,389) | 33,693 | 13,761
Net (purchases) sales of short term investments | 67,684 | (63,305) | 225
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 | 0
Dividends and return of capital from subsidiaries | 2,900 | 180,000 | 11,204
Contributions to subsidiaries | 0 | (8,550) | (1,949)
Due (from) to subsidiary | (22,313) | (118,529) | (13,639)
Net purchase of Platinum |  | 0 |
Net cash (used in) provided by investing activities | (7,223) | 14,076 | 15,120
Cash flows (used in) provided by 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
Net cash used in financing activities | 0 | 0 | 0
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0
Net (decrease) increase in cash and cash equivalents | (5,746) | 4,875 | (2,994)
Cash and cash equivalents, beginning of period | 5,908 | 1,033 | 4,027
Cash and cash equivalents, end of period | 162 | 5,908 | 1,033
Reportable Legal Entities | Platinum Underwriters Finance, Inc. (Subsidiary Issuer) |  |  |
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | (14,501) | (6,830) |
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 145,082 | 45,087 |
Purchases of fixed maturity investments trading | (291,053) | 0 |
Proceeds from sales and maturities of fixed maturity investments available for sale | 0 | 0 |
Net (purchases) sales of equity investments trading | 193,022 | (269,244) |
Net (purchases) sales of short term investments | (32,901) | 238,177 |
Net (purchases) sales of other investments | 0 | 0 |
Net purchases of investments in other ventures |  | 0 |
Net sales of other assets | 0 | 0 |
Dividends and return of capital from subsidiaries | 0 | 65,000 |
Contributions to subsidiaries | 0 | (66,753) |
Due (from) to subsidiary | (81) | 129 |
Net purchase of Platinum |  | 1,537 |
Net cash (used in) provided by investing activities | 14,069 | 13,933 |
Cash flows (used in) provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 |
Dividends paid – preference shares | 0 | 0 |
RenaissanceRe common share repurchases | 0 | 0 |
Issuance of debt |  | 0 |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 |
Net cash used in financing activities | 0 | 0 |
Effect of exchange rate changes on foreign currency cash | 0 | 0 |
Net (decrease) increase in cash and cash equivalents | (432) | 7,103 |
Cash and cash equivalents, beginning of period | 7,103 | 0 |
Cash and cash equivalents, end of period | 6,671 | 7,103 | 0
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | (34,607) | (17,871) |
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 0 | 0 |
Purchases of fixed maturity investments trading | 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 |
Net (purchases) sales of short term investments | 0 | 0 |
Net (purchases) sales of other investments | 0 | 0 |
Net purchases of investments in other ventures |  | 0 |
Net sales of other assets | 0 | 0 |
Dividends and return of capital from subsidiaries | 13,125 | 87,553 |
Contributions to subsidiaries | 0 | (185,000) |
Due (from) to subsidiary | 30,202 | (183,405) |
Net purchase of Platinum |  | 0 |
Net cash (used in) provided by investing activities | 43,327 | (280,852) |
Cash flows (used in) provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 |
Dividends paid – preference shares | 0 | 0 |
RenaissanceRe common share repurchases | 0 | 0 |
Issuance of debt |  | 299,400 |
Net third party redeemable noncontrolling interest share transactions | 0 | 0 |
Net cash used in financing activities | 0 | 299,400 |
Effect of exchange rate changes on foreign currency cash | 0 | 0 |
Net (decrease) increase in cash and cash equivalents | 8,720 | 677 |
Cash and cash equivalents, beginning of period | 677 | 0 |
Cash and cash equivalents, end of period | 9,397 | 677 | 0
Reportable Legal Entities | Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |
Cash flows provided by (used in) operating activities: |  |  |
Net cash provided by operating activities | 535,912 | 487,852 | 678,342
Cash flows provided by (used in) investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 7,572,923 | 9,323,024 | 7,573,813
Purchases of fixed maturity investments trading | (7,532,276) | (9,462,845) | (7,535,868)
Proceeds from sales and maturities of fixed maturity investments available for sale | 17,692 | 8,688 | 7,088
Net (purchases) sales of equity investments trading | (5,845) | 87,993 | (33,764)
Net (purchases) sales of short term investments | (41,586) | 610,705 | (28,919)
Net (purchases) sales of other investments | (68,589) | 15,843 | 59,120
Net purchases of investments in other ventures |  | (10,150) | 1,030
Net sales of other assets | 400 | 4,500 | 6,000
Dividends and return of capital from subsidiaries | (633,264) | (1,917,177) | (1,270,428)
Contributions to subsidiaries | 108,674 | 555,036 | 761,405
Due (from) to subsidiary | (31,566) | 93,809 | 7,324
Net purchase of Platinum |  | 224,744 |
Net cash (used in) provided by investing activities | (613,437) | (465,830) | (453,199)
Cash flows (used in) provided by 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 |  | 146,189 |
Net third party redeemable noncontrolling interest share transactions | (2,990) | (193,032) | (111,707)
Net cash used in financing activities | (2,990) | (46,843) | (111,707)
Effect of exchange rate changes on foreign currency cash | (4,637) | (10,732) | 9,920
Net (decrease) increase in cash and cash equivalents | (85,152) | (35,553) | 123,356
Cash and cash equivalents, beginning of period | 483,012 | 518,565 | 395,209
Cash and cash equivalents, end of period | $ 397,860 | $ 483,012 | $ 518,565

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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=66902209&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity). + 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=66902209&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 -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=66902209&loc=d3e3255-108585 + 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=66010992&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=66902209&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=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + 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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