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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 | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Cash flows provided by (used in) operating activities |  |
Net cash provided by (used in) operating activities | $ 1,329,779 | $ 1,264,432
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 11,564,999 | 12,835,916
Purchases of fixed maturity investments trading | (13,114,732) | (13,403,711)
Net sales of equity investments trading | 1,842 | (6,937)
Net purchases of short term investments | (549,218) | (1,362,151)
Net purchases of other investments | (101,302) | (130,476)
Net purchases of investments in other ventures | (2,407) | (2,341)
Net purchase of other assets | 0 | (4,108)
Return of investment from investment in other ventures | 9,255 | 11,250
Dividends and return of capital from subsidiaries | 0 | 0
Contributions to subsidiaries | 0 | 0
Due (from) to subsidiary | 0 | 0
Net proceeds from RenaissanceRe UK | 136,744 | 0
Net purchase of TMR | 0 | (276,206)
Net cash used in investing activities | (2,054,819) | (2,338,764)
Cash flows provided by financing activities |  |
Dividends paid – RenaissanceRe common shares | (50,785) | (44,547)
Dividends paid – preference shares | (23,634) | (27,567)
RenaissanceRe common share issuance, net of expenses | 1,095,507 | 0
Issuance of debt, net of expenses | 0 | 396,411
RenaissanceRe common share repurchases | (62,621) | 0
Redemption of 6.08% Series C preference shares | (125,000) | 0
Repayment of debt | (250,000) | 0
Net third-party redeemable noncontrolling interest share transactions | 59,104 | 515,952
Taxes paid on withholding shares | (10,264) | (7,229)
Net cash provided by financing activities | 632,307 | 833,020
Effect of exchange rate changes on foreign currency cash | 1,043 | 4,641
Net decrease in cash and cash equivalents | (91,690) | (236,671)
Cash and cash equivalents, beginning of period | 1,379,068 | 1,107,922
Cash and cash equivalents, end of period | $ 1,287,378 | 871,251
Series C Preference Shares |  |
Cash flows provided by financing activities |  |
Dividend rate, percentage | 6.08% |
Reportable Legal Entities | RenaissanceRe Finance Inc. (Subsidiary Issuer) |  |
Cash flows provided by (used in) operating activities |  |
Net cash provided by (used in) operating activities | $ (47,993) | (30,943)
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 36,302 | 43,746
Purchases of fixed maturity investments trading | (45,955) | (15,910)
Net sales of equity investments trading | 0 | 0
Net purchases of short term investments | 266,199 | (16,257)
Net purchases of other investments | 0 | 0
Net purchases of investments in other ventures | 0 | 0
Net purchase of other assets |  | 0
Return of investment from investment in other ventures | 0 | 0
Dividends and return of capital from subsidiaries | 118,026 | 13,500
Contributions to subsidiaries | (130,000) | 0
Due (from) to subsidiary | 55,815 | (416)
Net proceeds from RenaissanceRe UK | 0 |
Net purchase of TMR |  | 0
Net cash used in investing activities | 300,387 | 24,663
Cash flows provided by financing activities |  |
Dividends paid – RenaissanceRe common shares | 0 | 0
Dividends paid – preference shares | 0 | 0
RenaissanceRe common share issuance, net of expenses | 0 |
Issuance of debt, net of expenses |  | 0
RenaissanceRe common share repurchases | 0 |
Redemption of 6.08% Series C preference shares | 0 |
Repayment of debt | (250,000) |
Net third-party redeemable noncontrolling interest share transactions | 0 | 0
Taxes paid on withholding shares | 0 | 0
Net cash provided by financing activities | (250,000) | 0
Effect of exchange rate changes on foreign currency cash | 0 | 0
Net decrease in cash and cash equivalents | 2,394 | (6,280)
Cash and cash equivalents, beginning of period | 8,731 | 9,604
Cash and cash equivalents, end of period | 11,125 | 3,324
Reportable Legal Entities | RenaissanceRe Holdings Ltd. (Parent Guarantor) |  |
Cash flows provided by (used in) operating activities |  |
Net cash provided by (used in) operating activities | 19,787 | (381,508)
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 210,973 | 277,030
Purchases of fixed maturity investments trading | (346,002) | (66,740)
Net sales of equity investments trading | 0 | 0
Net purchases of short term investments | 72,479 | (34,209)
Net purchases of other investments | 0 | 0
Net purchases of investments in other ventures | 0 | 0
Net purchase of other assets |  | 0
Return of investment from investment in other ventures | 0 | 0
Dividends and return of capital from subsidiaries | 827,626 | 855,396
Contributions to subsidiaries | (1,538,708) | (1,013,916)
Due (from) to subsidiary | (85,151) | 48,444
Net proceeds from RenaissanceRe UK | 0 |
Net purchase of TMR |  | 0
Net cash used in investing activities | (858,783) | 66,005
Cash flows provided by financing activities |  |
Dividends paid – RenaissanceRe common shares | (50,785) | (44,547)
Dividends paid – preference shares | (23,634) | (27,567)
RenaissanceRe common share issuance, net of expenses | 1,095,507 |
Issuance of debt, net of expenses |  | 396,411
RenaissanceRe common share repurchases | (62,621) |
Redemption of 6.08% Series C preference shares | (125,000) |
Repayment of debt | 0 |
Net third-party redeemable noncontrolling interest share transactions | 0 | 0
Taxes paid on withholding shares | (10,264) | (7,229)
Net cash provided by financing activities | 823,203 | 317,068
Effect of exchange rate changes on foreign currency cash | (144) | 0
Net decrease in cash and cash equivalents | (15,937) | 1,565
Cash and cash equivalents, beginning of period | 26,460 | 3,534
Cash and cash equivalents, end of period | 10,523 | 5,099
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 (used in) operating activities | 1,357,985 | 1,676,883
Cash flows used in investing activities |  |
Proceeds from sales and maturities of fixed maturity investments trading | 11,317,724 | 12,515,140
Purchases of fixed maturity investments trading | (12,722,775) | (13,321,061)
Net sales of equity investments trading | 1,842 | (6,937)
Net purchases of short term investments | (887,896) | (1,311,685)
Net purchases of other investments | (101,302) | (130,476)
Net purchases of investments in other ventures | (2,407) | (2,341)
Net purchase of other assets |  | (4,108)
Return of investment from investment in other ventures | 9,255 | 11,250
Dividends and return of capital from subsidiaries | (945,652) | (868,896)
Contributions to subsidiaries | 1,668,708 | 1,013,916
Due (from) to subsidiary | 29,336 | (48,028)
Net proceeds from RenaissanceRe UK | 136,744 |
Net purchase of TMR |  | (276,206)
Net cash used in investing activities | (1,496,423) | (2,429,432)
Cash flows provided by financing activities |  |
Dividends paid – RenaissanceRe common shares | 0 | 0
Dividends paid – preference shares | 0 | 0
RenaissanceRe common share issuance, net of expenses | 0 |
Issuance of debt, net of expenses |  | 0
RenaissanceRe common share repurchases | 0 |
Redemption of 6.08% Series C preference shares | 0 |
Repayment of debt | 0 |
Net third-party redeemable noncontrolling interest share transactions | 59,104 | 515,952
Taxes paid on withholding shares | 0 | 0
Net cash provided by financing activities | 59,104 | 515,952
Effect of exchange rate changes on foreign currency cash | 1,187 | 4,641
Net decrease in cash and cash equivalents | (78,147) | (231,956)
Cash and cash equivalents, beginning of period | 1,343,877 | 1,094,784
Cash and cash equivalents, end of period | $ 1,265,730 | $ 862,828

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