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SCHEDULE II. CONDENSED FINANCIAL INFORMATION OF REGISTRANT- Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income (loss) attributable to RenaissanceRe | $ 1,870,360 | $ 2,561,132 | $ (1,061,203)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities |  |  |
Net realized and unrealized (gains) losses on investments | (29,439) | (482,794) | 1,635,192
Other | (371,707) | (579,280) | (259,168)
Net cash provided by (used in) operating activities | 4,164,822 | 1,911,634 | 1,603,683
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 23,515,450 | 21,796,577 | 22,086,168
Purchases of fixed maturity investments trading | (26,296,842) | (24,771,411) | (24,923,131)
Return of investments in other ventures | 41,349 | 5,554 | 2,248
Net purchase of Validus | 0 | (2,433,746) | 0
Net cash provided by (used in) investing activities | (3,060,856) | (3,822,636) | (3,016,176)
Cash flows provided by (used in) financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (80,849) | (75,112) | (64,675)
Dividends paid – preference shares | (35,375) | (35,375) | (35,396)
RenaissanceRe common share repurchases | (666,921) | 0 | (166,664)
RenaissanceRe common share issuance, net of expenses | 0 | 1,351,608 | 0
Issuance of debt, net of expenses | 0 | 740,581 | 0
Taxes paid on withholding shares | (23,580) | (20,518) | (10,911)
Net cash provided by (used in) financing activities | (1,287,515) | 2,588,639 | 725,342
Effect of exchange rate changes on foreign currency cash | (17,365) | 5,542 | 22,471
Net increase (decrease) in cash and cash equivalents | (200,914) | 683,179 | (664,680)
Cash and cash equivalents, beginning of year | 1,877,518 | 1,194,339 | 1,859,019
Cash and cash equivalents, end of year | 1,676,604 | 1,877,518 | 1,194,339
Parent Company |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net income (loss) attributable to RenaissanceRe | 1,870,360 | 2,561,131 | (1,061,204)
Less: equity in net income (loss) of subsidiaries | (2,017,805) | (2,708,061) | 988,610
Loss before equity in net income of subsidiaries | (147,445) | (146,930) | (72,594)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities |  |  |
Net realized and unrealized (gains) losses on investments | 334 | 67,868 | 2,051
Other | 142,051 | 72,691 | 36,601
Net cash provided by (used in) operating activities | (5,060) | (6,371) | (33,942)
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Proceeds from sales and maturities of fixed maturity investments trading | 309,490 | 1,613,740 | 198,341
Purchases of fixed maturity investments trading | (387,276) | (1,505,160) | (375,804)
Net sales (purchases) of short term investments | 147,296 | (211,370) | (21,037)
Return of investments in other ventures | 1,079,438 | 1,097,301 | 1,009,108
Contributions to subsidiaries | (247,147) | (169,204) | (349,336)
Due to (from) subsidiary | (115,041) | (7,088) | (178,470)
Net cash provided by (used in) investing activities | 786,760 | (1,916,781) | 282,802
Cash flows provided by (used in) financing activities |  |  |
Dividends paid – RenaissanceRe common shares | (80,850) | (75,112) | (64,675)
Dividends paid – preference shares | (35,375) | (35,375) | (35,396)
RenaissanceRe common share repurchases | (666,921) | 0 | (166,664)
RenaissanceRe common share issuance, net of expenses | 0 | 1,351,608 | 0
Issuance of debt, net of expenses | 0 | 740,581 | 0
Taxes paid on withholding shares | (23,580) | (20,518) | (10,911)
Net cash provided by (used in) financing activities | (806,726) | 1,961,184 | (277,646)
Effect of exchange rate changes on foreign currency cash | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents | (25,026) | 38,032 | (28,786)
Cash and cash equivalents, beginning of year | 45,080 | 7,048 | 35,834
Cash and cash equivalents, end of year | 20,054 | 45,080 | 7,048
Parent Company | Validus Specialty |  |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Due to (from) subsidiary | 0 | (45,467) | 0
Parent Company | Validus Holdings, Ltd and Talbot Underwriting Limited |  |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Net purchase of Validus | $ 0 | $ (2,689,533) | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + 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 -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + 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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + 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/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 21D -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-21D + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + 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 -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + 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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