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SEGMENT REPORTING | 6 Months Ended
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Jun. 30, 2025
Segment Reporting, Measurement Disclosures [Abstract] |
SEGMENT REPORTING | SEGMENT REPORTING The Company’s reportable segments are defined as follows: (1) Property, which is comprised of catastrophe and other property (re)insurance written on behalf of the Company’s consolidated operating subsidiaries, joint ventures and managed funds, and (2) Casualty and Specialty, which is comprised of casualty and specialty (re)insurance written on behalf of the Company’s consolidated operating subsidiaries, joint ventures and managed funds. In addition to its reportable segments, the Company has an Other category, which primarily includes its investments unit, strategic investments, corporate expenses, capital servicing costs, noncontrolling interests and certain expenses related to acquisitions and dispositions. The Company’s reportable segments each have executive leadership who are responsible for the overall performance of their respective segments and who are directly accountable to the Company’s chief operating decision maker (“CODM”), the Chief Executive Officer of RenaissanceRe, who is ultimately responsible for reviewing the business to assess performance, make operating decisions and allocate resources. The Company reports the results of its operations consistent with the manner in which the CODM reviews the business. The Company does not manage its assets by segment; accordingly, net investment income and total assets are not allocated to the segments. A summary of the significant components of the Company’s revenues and expenses by segment is as follows:
| Three months ended June 30, 2025 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 1,731,935 |  |  | $ | 1,689,245 |  |  | $ | — |  |  | $ | 3,421,180 |  |
| Net premiums written | $ | 1,325,557 |  |  | $ | 1,444,713 |  |  | $ | — |  |  | $ | 2,770,270 |  |
| Net premiums earned | $ | 868,010 |  |  | $ | 1,544,144 |  |  | $ | — |  |  | $ | 2,412,154 |  |
| Net claims and claim expenses incurred | (7,930) |  |  | 1,050,053 |  |  | — |  |  | 1,042,123 |  |
| Acquisition expenses | 174,200 |  |  | 468,405 |  |  | — |  |  | 642,605 |  |
| Operational expenses | 71,569 |  |  | 54,169 |  |  | — |  |  | 125,738 |  |
| Underwriting income (loss) | $ | 630,171 |  |  | $ | (28,483) |  |  | $ | — |  |  | 601,688 |  |
| Net investment income |  |  |  |  | 413,108 |  |  | 413,108 |  |
| Net foreign exchange gains (losses) |  |  |  |  | 8,660 |  |  | 8,660 |  |
| Equity in earnings (losses) of other ventures |  |  |  |  | 20,333 |  |  | 20,333 |  |
| Other income (loss) |  |  |  |  | 2,624 |  |  | 2,624 |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | 349,720 |  |  | 349,720 |  |
| Corporate expenses |  |  |  |  | (23,781) |  |  | (23,781) |  |
| Interest expense |  |  |  |  | (31,793) |  |  | (31,793) |  |
| Income (loss) before taxes |  |  |  |  |  |  | 1,340,559 |  |
| Income tax benefit (expense) |  |  |  |  | (176,869) |  |  | (176,869) |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | (328,339) |  |  | (328,339) |  |
| Dividends on preference shares |  |  |  |  | (8,844) |  |  | (8,844) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 826,507 |  |
| Net claims and claim expenses incurred – current accident year | $ | 258,646 |  |  | $ | 1,053,187 |  |  | $ | — |  |  | $ | 1,311,833 |  |
| Net claims and claim expenses incurred – prior accident years | (266,576) |  |  | (3,134) |  |  | — |  |  | (269,710) |  |
| Net claims and claim expenses incurred – total | $ | (7,930) |  |  | $ | 1,050,053 |  |  | $ | — |  |  | $ | 1,042,123 |  |
| Net claims and claim expense ratio – current accident year | 29.8 | % |  | 68.2 | % |  |  |  | 54.4 | % |
| Net claims and claim expense ratio – prior accident years | (30.7) | % |  | (0.2) | % |  |  |  | (11.2) | % |
| Net claims and claim expense ratio – calendar year | (0.9) | % |  | 68.0 | % |  |  |  | 43.2 | % |
| Underwriting expense ratio | 28.3 | % |  | 33.8 | % |  |  |  | 31.9 | % |
| Combined ratio | 27.4 | % |  | 101.8 | % |  |  |  | 75.1 | % |
| Six months ended June 30, 2025 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 3,862,768 |  |  | $ | 3,713,915 |  |  | $ | — |  |  | $ | 7,576,683 |  |
| Net premiums written | $ | 3,016,551 |  |  | $ | 3,197,248 |  |  | $ | — |  |  | $ | 6,213,799 |  |
| Net premiums earned | $ | 2,115,960 |  |  | $ | 3,016,975 |  |  | $ | — |  |  | $ | 5,132,935 |  |
| Net claims and claim expenses incurred | 1,615,327 |  |  | 2,170,554 |  |  | — |  |  | 3,785,881 |  |
| Acquisition expenses | 341,845 |  |  | 948,195 |  |  | — |  |  | 1,290,040 |  |
| Operational expenses | 135,835 |  |  | 90,088 |  |  | — |  |  | 225,923 |  |
| Underwriting income (loss) | $ | 22,953 |  |  | $ | (191,862) |  |  | $ | — |  |  | (168,909) |  |
| Net investment income |  |  |  |  | 818,461 |  |  | 818,461 |  |
| Net foreign exchange gains (losses) |  |  |  |  | 1,332 |  |  | 1,332 |  |
| Equity in earnings of other ventures |  |  |  |  | 38,161 |  |  | 38,161 |  |
| Other income (loss) |  |  |  |  | 3,538 |  |  | 3,538 |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | 682,660 |  |  | 682,660 |  |
| Corporate expenses |  |  |  |  | (46,591) |  |  | (46,591) |  |
| Interest expense |  |  |  |  | (58,879) |  |  | (58,879) |  |
| Income (loss) before taxes and redeemable noncontrolling interests |  |  |  |  |  |  | 1,269,773 |  |
| Income tax benefit (expense) |  |  |  |  | (131,344) |  |  | (131,344) |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | (133,087) |  |  | (133,087) |  |
| Dividends on preference shares |  |  |  |  | (17,688) |  |  | (17,688) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 987,654 |  |
| Net claims and claim expenses incurred – current accident year | $ | 2,068,961 |  |  | $ | 2,182,504 |  |  | $ | — |  |  | $ | 4,251,465 |  |
| Net claims and claim expenses incurred – prior accident years | (453,634) |  |  | (11,950) |  |  | — |  |  | (465,584) |  |
| Net claims and claim expenses incurred – total | $ | 1,615,327 |  |  | $ | 2,170,554 |  |  | $ | — |  |  | $ | 3,785,881 |  |
| Net claims and claim expense ratio – current accident year | 97.8 | % |  | 72.3 | % |  |  |  | 82.8 | % |
| Net claims and claim expense ratio – prior accident years | (21.5) | % |  | (0.4) | % |  |  |  | (9.0) | % |
| Net claims and claim expense ratio – calendar year | 76.3 | % |  | 71.9 | % |  |  |  | 73.8 | % |
| Underwriting expense ratio | 22.6 | % |  | 34.5 | % |  |  |  | 29.5 | % |
| Combined ratio | 98.9 | % |  | 106.4 | % |  |  |  | 103.3 | % |
| Three months ended June 30, 2024 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 1,753,098 |  |  | $ | 1,672,397 |  |  | $ | — |  |  | $ | 3,425,495 |  |
| Net premiums written | $ | 1,358,660 |  |  | $ | 1,479,851 |  |  | $ | — |  |  | $ | 2,838,511 |  |
| Net premiums earned | $ | 980,834 |  |  | $ | 1,560,481 |  |  | $ | — |  |  | $ | 2,541,315 |  |
| Net claims and claim expenses incurred | 273,354 |  |  | 1,036,148 |  |  | — |  |  | 1,309,502 |  |
| Acquisition expenses | 188,345 |  |  | 456,093 |  |  | — |  |  | 644,438 |  |
| Operational expenses | 67,425 |  |  | 40,614 |  |  | — |  |  | 108,039 |  |
| Underwriting income (loss) | $ | 451,710 |  |  | $ | 27,626 |  |  | $ | — |  |  | 479,336 |  |
| Net investment income |  |  |  |  | 410,845 |  |  | 410,845 |  |
| Net foreign exchange gains (losses) |  |  |  |  | (8,815) |  |  | (8,815) |  |
| Equity in earnings (losses) of other ventures |  |  |  |  | 12,590 |  |  | 12,590 |  |
| Other income (loss) |  |  |  |  | 169 |  |  | 169 |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | (127,584) |  |  | (127,584) |  |
| Corporate expenses |  |  |  |  | (35,159) |  |  | (35,159) |  |
| Interest expense |  |  |  |  | (23,609) |  |  | (23,609) |  |
| Income (loss) before taxes |  |  |  |  |  |  | 707,773 |  |
| Income tax benefit (expense) |  |  |  |  | 20,848 |  |  | 20,848 |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | (224,731) |  |  | (224,731) |  |
| Dividends on preference shares |  |  |  |  | (8,844) |  |  | (8,844) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 495,046 |  |
| Net claims and claim expenses incurred – current accident year | $ | 357,745 |  |  | $ | 1,060,028 |  |  | $ | — |  |  | $ | 1,417,773 |  |
| Net claims and claim expenses incurred – prior accident years | (84,391) |  |  | (23,880) |  |  | — |  |  | (108,271) |  |
| Net claims and claim expenses incurred – total | $ | 273,354 |  |  | $ | 1,036,148 |  |  | $ | — |  |  | $ | 1,309,502 |  |
| Net claims and claim expense ratio – current accident year | 36.5 | % |  | 67.9 | % |  |  |  | 55.8 | % |
| Net claims and claim expense ratio – prior accident years | (8.6) | % |  | (1.5) | % |  |  |  | (4.3) | % |
| Net claims and claim expense ratio – calendar year | 27.9 | % |  | 66.4 | % |  |  |  | 51.5 | % |
| Underwriting expense ratio | 26.0 | % |  | 31.8 | % |  |  |  | 29.6 | % |
| Combined ratio | 53.9 | % |  | 98.2 | % |  |  |  | 81.1 | % |
| Six months ended June 30, 2024 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 3,642,979 |  |  | $ | 3,773,200 |  |  | $ | — |  |  | $ | 7,416,179 |  |
| Net premiums written | $ | 2,756,278 |  |  | $ | 3,281,806 |  |  | $ | — |  |  | $ | 6,038,084 |  |
| Net premiums earned | $ | 1,916,917 |  |  | $ | 3,068,308 |  |  | $ | — |  |  | $ | 4,985,225 |  |
| Net claims and claim expenses incurred | 427,603 |  |  | 2,048,022 |  |  | — |  |  | 2,475,625 |  |
| Acquisition expenses | 374,127 |  |  | 901,232 |  |  | — |  |  | 1,275,359 |  |
| Operational expenses | 129,049 |  |  | 85,174 |  |  | — |  |  | 214,223 |  |
| Underwriting income (loss) | $ | 986,138 |  |  | $ | 33,880 |  |  | $ | — |  |  | 1,020,018 |  |
| Net investment income |  |  |  |  | 801,620 |  |  | 801,620 |  |
| Net foreign exchange gains (losses) |  |  |  |  | (44,498) |  |  | (44,498) |  |
| Equity in earnings of other ventures |  |  |  |  | 26,717 |  |  | 26,717 |  |
| Other income (loss) |  |  |  |  | 119 |  |  | 119 |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | (341,238) |  |  | (341,238) |  |
| Corporate expenses |  |  |  |  | (74,411) |  |  | (74,411) |  |
| Interest expense |  |  |  |  | (46,713) |  |  | (46,713) |  |
| Income (loss) before taxes and redeemable noncontrolling interests |  |  |  |  |  |  | 1,341,614 |  |
| Income tax benefit (expense) |  |  |  |  | 5,476 |  |  | 5,476 |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | (469,558) |  |  | (469,558) |  |
| Dividends on preference shares |  |  |  |  | (17,688) |  |  | (17,688) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 859,844 |  |
| Net claims and claim expenses incurred – current accident year | $ | 606,661 |  |  | $ | 2,074,316 |  |  | $ | — |  |  | $ | 2,680,977 |  |
| Net claims and claim expenses incurred – prior accident years | (179,058) |  |  | (26,294) |  |  | — |  |  | (205,352) |  |
| Net claims and claim expenses incurred – total | $ | 427,603 |  |  | $ | 2,048,022 |  |  | $ | — |  |  | $ | 2,475,625 |  |
| Net claims and claim expense ratio – current accident year | 31.6 | % |  | 67.6 | % |  |  |  | 53.8 | % |
| Net claims and claim expense ratio – prior accident years | (9.3) | % |  | (0.9) | % |  |  |  | (4.1) | % |
| Net claims and claim expense ratio – calendar year | 22.3 | % |  | 66.7 | % |  |  |  | 49.7 | % |
| Underwriting expense ratio | 26.3 | % |  | 32.2 | % |  |  |  | 29.8 | % |
| Combined ratio | 48.6 | % |  | 98.9 | % |  |  |  | 79.5 | % |

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-21 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name 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