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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows (used in) provided by operating activities |  |  |
Net cash provided by operating activities | $ 2,137,195 | $ 1,221,701 | $ 1,025,787
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 17,313,940 | 11,585,576 | 9,490,669
Purchases of fixed maturity investments trading | (17,919,343) | (12,489,972) | (10,093,532)
Net (purchases) sales of equity investments trading | (7,841) | 14,156 | 115,837
Net sales (purchases) of short term investments | (1,900,741) | (1,436,389) | 364,011
Net purchases of other investments | (202,878) | (199,475) | (19,419)
Net purchases of investments in other ventures | (2,717) | (21,473) | 0
Return of investment from investment in other ventures | 11,250 | 8,464 | 20,000
Net (purchases) sales of other assets | (4,108) | 2,500 | 0
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 TMR | (276,206) | 0 | 0
Net cash used in investing activities | (2,988,644) | (2,536,613) | (122,434)
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (59,368) | (52,841) | (51,370)
Dividends paid – preference shares | (36,756) | (30,088) | (22,381)
RenaissanceRe common share repurchases | 0 | 0 | (188,591)
RenaissanceRe common share issuance | 0 | 250,000 | 0
Issuance of preference shares, net of expenses | 0 | 241,448 | 0
Issuance of debt, net of expenses | 396,411 | 0 | 295,866
Repayment of debt | 0 | 0 | (250,000)
Net third-party redeemable noncontrolling interest share transactions | 827,083 | 665,683 | 260,475
Taxes paid on withholding shares | (7,253) | (7,862) | (15,139)
Net cash provided by financing activities | 1,120,117 | 1,066,340 | 28,860
Effect of exchange rate changes on foreign currency cash | 2,478 | (5,098) | 8,222
Net increase (decrease) in cash and cash equivalents | 271,146 | (253,670) | 940,435
Cash and cash equivalents, beginning of year | 1,107,922 | 1,361,592 | 421,157
Cash and cash equivalents, end of year | 1,379,068 | 1,107,922 | 1,361,592
RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |  |
Cash flows (used in) provided by operating activities |  |  |
Net cash provided by operating activities | (2,861) | 17,187 | 21,118
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 306,579 | 384,818 | 261,601
Purchases of fixed maturity investments trading | (66,740) | (520,935) | (344,463)
Net sales (purchases) of short term investments | (116,499) | 48,600 | 243,571
Dividends and return of capital from subsidiaries | 1,400,944 | 672,098 | 478,496
Net cash used in investing activities | (267,247) | (428,966) | 263,952
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (59,368) | (52,841) | (51,370)
Dividends paid – preference shares | (36,756) | (30,088) | (22,381)
RenaissanceRe common share repurchases | 0 | 0 | (188,591)
RenaissanceRe common share issuance | 0 | 250,000 | 0
Issuance of preference shares, net of expenses | 0 | 241,448 | 0
Issuance of debt, net of expenses | 396,411 | 0 | 0
Repayment of debt |  |  | 0
Taxes paid on withholding shares | (7,253) | (7,862) | (15,139)
Net cash provided by financing activities | 293,034 | 400,657 | (277,481)
Cash and cash equivalents, beginning of year | 3,534 | 14,656 | 7,067
Cash and cash equivalents, end of year | 26,460 | 3,534 | 14,656
Other RenaissanceRe Holdings Ltd. Subsidiaries And Eliminations (Non-Guarantor Subsidiaries) |  |  |
Cash flows provided by financing activities |  |  |
Repayment of debt |  |  | 0
RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |
Cash flows provided by 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 | (2,861) | 17,187 | 21,118
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 306,579 | 384,818 | 261,601
Purchases of fixed maturity investments trading | (66,740) | (520,935) | (344,463)
Net (purchases) sales of equity investments trading | 0 | 0 | 0
Net sales (purchases) of short term investments | (116,499) | 48,600 | 243,571
Net purchases of other investments | 0 | 0 | 0
Net purchases of investments in other ventures | 0 | 0 |
Return of investment from investment in other ventures | 0 | 0 | 0
Net (purchases) sales of other assets | 0 | 0 |
Dividends and return of capital from subsidiaries | 1,400,944 | 672,098 | 478,496
Contributions to subsidiaries | (1,165,607) | (785,785) | (669,672)
Due to (from) subsidiaries | (625,924) | (227,762) | 294,419
Net purchase of TMR | 0 |  |
Net cash used in investing activities | (267,247) | (428,966) | 263,952
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (59,368) | (52,841) | (51,370)
Dividends paid – preference shares | (36,756) | (30,088) | (22,381)
RenaissanceRe common share repurchases |  |  | (188,591)
RenaissanceRe common share issuance |  | 250,000 |
Issuance of preference shares, net of expenses |  | 241,448 |
Issuance of debt, net of expenses | 396,411 |  | 0
Net third-party redeemable noncontrolling interest share transactions | 0 | 0 | 0
Taxes paid on withholding shares | (7,253) | (7,862) | (15,139)
Net cash provided by financing activities | 293,034 | 400,657 | (277,481)
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | 22,926 | (11,122) | 7,589
Cash and cash equivalents, beginning of year | 3,534 | 14,656 | 7,067
Cash and cash equivalents, end of year | 26,460 | 3,534 | 14,656
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 | 1,769,250 | 1,135,554 | 1,363,084
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 16,868,826 | 11,046,968 | 8,550,179
Purchases of fixed maturity investments trading | (17,741,881) | (11,840,813) | (9,229,732)
Net (purchases) sales of equity investments trading | (4,483) | 15,464 | 32,265
Net sales (purchases) of short term investments | (1,501,264) | (1,485,040) | 79,520
Net purchases of other investments | (202,878) | (199,475) | (19,419)
Net purchases of investments in other ventures | (2,717) | (21,473) |
Return of investment from investment in other ventures | 11,250 | 8,464 | 20,000
Net (purchases) sales of other assets | (4,108) | 2,500 |
Dividends and return of capital from subsidiaries | (1,418,794) | (672,098) | (529,537)
Contributions to subsidiaries | 1,290,607 | 867,632 | 706,211
Due to (from) subsidiaries | 625,840 | 227,838 | (293,800)
Net purchase of TMR | (276,206) |  |
Net cash used in investing activities | (2,355,808) | (2,050,033) | (684,313)
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0
Dividends paid – preference shares | 0 | 0 | 0
RenaissanceRe common share repurchases |  |  | 0
RenaissanceRe common share issuance |  | 0 |
Issuance of preference shares, net of expenses |  | 0 |
Issuance of debt, net of expenses | 0 |  | 0
Net third-party redeemable noncontrolling interest share transactions | 827,083 | 665,683 | 260,475
Taxes paid on withholding shares | 0 | 0 | 0
Net cash provided by financing activities | 827,083 | 665,683 | 260,475
Effect of exchange rate changes on foreign currency cash | 2,478 | (5,098) | 8,222
Net increase (decrease) in cash and cash equivalents | 243,003 | (253,894) | 947,468
Cash and cash equivalents, beginning of year | 1,091,434 | 1,345,328 | 397,860
Cash and cash equivalents, end of year | 1,334,437 | 1,091,434 | 1,345,328
Reportable Legal Entities | RenRe North America Holdings Inc. (Subsidiary Issuer) |  |  |
Cash flows (used in) provided by operating activities |  |  |
Net cash provided by operating activities | 3,872 | 6,315 | (8,253)
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 77,798 | 97,272 | 100,248
Purchases of fixed maturity investments trading | (77,145) | (72,292) | (99,568)
Net (purchases) sales of equity investments trading | (3,358) | (1,308) | (1,752)
Net sales (purchases) of short term investments | 739 | (404) | 114
Net purchases of other investments | 0 | 0 | 0
Net purchases of investments in other ventures | 0 | 0 |
Return of investment from investment in other ventures | 0 | 0 | 0
Net (purchases) sales of other assets | 0 | 0 |
Dividends and return of capital from subsidiaries | 4,350 | 0 | 9,175
Contributions to subsidiaries |  | (16,847) | 0
Contributions to subsidiaries | 0 |  |
Due to (from) subsidiaries | (166) | (9,525) | 13
Net purchase of TMR | 0 |  |
Net cash used in investing activities | 2,218 | (3,104) | 8,230
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0
Dividends paid – preference shares | 0 | 0 | 0
RenaissanceRe common share repurchases |  |  | 0
RenaissanceRe common share issuance |  | 0 |
Issuance of preference shares, net of expenses |  | 0 |
Issuance of debt, net of expenses | 0 |  | 0
Net third-party redeemable noncontrolling interest share transactions | 0 | 0 | 0
Taxes paid on withholding shares | 0 | 0 | 0
Net cash provided by 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 | 6,090 | 3,211 | (23)
Cash and cash equivalents, beginning of year | 3,350 | 139 | 162
Cash and cash equivalents, end of year | 9,440 | 3,350 | 139
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)
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading |  |  | 289,741
Purchases of fixed maturity investments trading |  |  | (143,991)
Net (purchases) sales of equity investments trading |  |  | 85,324
Net sales (purchases) of short term investments |  |  | 41,299
Net purchases of other investments |  |  | 0
Return of investment from investment in other ventures |  |  | 0
Dividends and return of capital from subsidiaries |  |  | 0
Contributions to subsidiaries |  |  | (26,649)
Due to (from) subsidiaries |  |  | (123)
Net cash used in investing activities |  |  | 245,601
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares |  |  | 0
Dividends paid – preference shares |  |  | 0
RenaissanceRe common share repurchases |  |  | 0
Issuance of debt, net of expenses |  |  | 0
Repayment of debt |  |  | (250,000)
Net third-party redeemable noncontrolling interest share transactions |  |  | 0
Taxes paid on withholding shares |  |  | 0
Net cash provided by financing activities |  |  | (250,000)
Effect of exchange rate changes on foreign currency cash |  |  | 0
Net increase (decrease) in cash and cash equivalents |  |  | (6,671)
Cash and cash equivalents, beginning of year |  | 0 | 6,671
Cash and cash equivalents, end of year |  |  | 0
Reportable Legal Entities | RenaissanceRe Finance, Inc. (Subsidiary Issuer) |  |  |
Cash flows (used in) provided by operating activities |  |  |
Net cash provided by operating activities | 366,934 | 62,645 | (347,890)
Cash flows used in investing activities |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 60,737 | 56,518 | 288,900
Purchases of fixed maturity investments trading | (33,577) | (55,932) | (275,778)
Net (purchases) sales of equity investments trading | 0 | 0 | 0
Net sales (purchases) of short term investments | (283,717) | 455 | (493)
Net purchases of other investments | 0 | 0 | 0
Net purchases of investments in other ventures | 0 | 0 |
Return of investment from investment in other ventures | 0 | 0 | 0
Net (purchases) sales of other assets | 0 | 0 |
Dividends and return of capital from subsidiaries | 13,500 | 0 | 41,866
Contributions to subsidiaries | (125,000) | (65,000) | (9,890)
Due to (from) subsidiaries | 250 | 9,449 | (509)
Net purchase of TMR | 0 |  |
Net cash used in investing activities | (367,807) | (54,510) | 44,096
Cash flows provided by financing activities |  |  |
Dividends paid – RenaissanceRe common shares | 0 | 0 | 0
Dividends paid – preference shares | 0 | 0 | 0
RenaissanceRe common share repurchases |  |  | 0
RenaissanceRe common share issuance |  | 0 |
Issuance of preference shares, net of expenses |  | 0 |
Issuance of debt, net of expenses | 0 |  | 295,866
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 financing activities | 0 | 0 | 295,866
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | (873) | 8,135 | (7,928)
Cash and cash equivalents, beginning of year | 9,604 | 1,469 | 9,397
Cash and cash equivalents, end of year | $ 8,731 | $ 9,604 | $ 1,469

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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=118932676&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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