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Segment Reporting (Tables) | 12 Months Ended
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Dec. 31, 2023
Segment Reporting, Measurement Disclosures [Abstract] |
Schedule of Significant Components of the Company's Revenues and Expenses | A summary of the significant components of the Company’s revenues and expenses by segment is as follows:
| Year ended December 31, 2023 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 3,562,414 |  |  | $ | 5,299,952 |  |  | $ | — |  |  | $ | 8,862,366 |  |
| Net premiums written | $ | 2,967,309 |  |  | $ | 4,500,504 |  |  | $ | — |  |  | $ | 7,467,813 |  |
| Net premiums earned | $ | 3,090,792 |  |  | $ | 4,380,341 |  |  | $ | — |  |  | $ | 7,471,133 |  |
| Net claims and claim expenses incurred | 799,905 |  |  | 2,773,604 |  |  | — |  |  | 3,573,509 |  |
| Acquisition expenses | 600,127 |  |  | 1,274,907 |  |  | — |  |  | 1,875,034 |  |
| Operational expenses | 251,433 |  |  | 123,749 |  |  | — |  |  | 375,182 |  |
| Underwriting income (loss) | $ | 1,439,327 |  |  | $ | 208,081 |  |  | $ | — |  |  | 1,647,408 |  |
| Net investment income |  |  |  |  | 1,253,110 |  |  | 1,253,110 |  |
| Net foreign exchange gains (losses) |  |  |  |  | (41,479) |  |  | (41,479) |  |
| Equity in earnings of other ventures |  |  |  |  | 43,474 |  |  | 43,474 |  |
| Other income (loss) |  |  |  |  | (6,152) |  |  | (6,152) |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | 414,522 |  |  | 414,522 |  |
| Corporate expenses |  |  |  |  | (127,642) |  |  | (127,642) |  |
| Interest expense |  |  |  |  | (73,181) |  |  | (73,181) |  |
| Income (loss) before taxes and redeemable noncontrolling interests |  |  |  |  |  |  | 3,110,060 |  |
| Income tax benefit (expense) |  |  |  |  | 510,067 |  |  | 510,067 |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | (1,058,995) |  |  | (1,058,995) |  |
| Dividends on preference shares |  |  |  |  | (35,375) |  |  | (35,375) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | 2,525,757 |  |
| Net claims and claim expenses incurred – current accident year | $ | 1,208,810 |  |  | $ | 2,815,306 |  |  | $ | — |  |  | $ | 4,024,116 |  |
| Net claims and claim expenses incurred – prior accident years | (408,905) |  |  | (41,702) |  |  | — |  |  | (450,607) |  |
| Net claims and claim expenses incurred – total | $ | 799,905 |  |  | $ | 2,773,604 |  |  | $ | — |  |  | $ | 3,573,509 |  |
| Net claims and claim expense ratio – current accident year | 39.1 | % |  | 64.3 | % |  |  |  | 53.9 | % |
| Net claims and claim expense ratio – prior accident years | (13.2) | % |  | (1.0) | % |  |  |  | (6.1) | % |
| Net claims and claim expense ratio – calendar year | 25.9 | % |  | 63.3 | % |  |  |  | 47.8 | % |
| Underwriting expense ratio | 27.5 | % |  | 31.9 | % |  |  |  | 30.1 | % |
| Combined ratio | 53.4 | % |  | 95.2 | % |  |  |  | 77.9 | % |
| Year ended December 31, 2022 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 3,734,241 |  |  | $ | 5,479,299 |  |  | $ | — |  |  | $ | 9,213,540 |  |
| Net premiums written | $ | 2,847,659 |  |  | $ | 4,348,501 |  |  | $ | — |  |  | $ | 7,196,160 |  |
| Net premiums earned | $ | 2,770,227 |  |  | $ | 3,563,762 |  |  | $ | — |  |  | $ | 6,333,989 |  |
| Net claims and claim expenses incurred | 2,044,771 |  |  | 2,294,069 |  |  | — |  |  | 4,338,840 |  |
| Acquisition expenses | 547,210 |  |  | 1,021,396 |  |  | — |  |  | 1,568,606 |  |
| Operational expenses | 194,355 |  |  | 82,336 |  |  | — |  |  | 276,691 |  |
| Underwriting income (loss) | $ | (16,109) |  |  | $ | 165,961 |  |  | $ | — |  |  | 149,852 |  |
| Net investment income |  |  |  |  | 559,932 |  |  | 559,932 |  |
| Net foreign exchange gains (losses) |  |  |  |  | (56,909) |  |  | (56,909) |  |
| Equity in earnings of other ventures |  |  |  |  | 11,249 |  |  | 11,249 |  |
| Other income (loss) |  |  |  |  | 12,636 |  |  | 12,636 |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | (1,800,485) |  |  | (1,800,485) |  |
| Corporate expenses |  |  |  |  | (46,775) |  |  | (46,775) |  |
| Interest expense |  |  |  |  | (48,335) |  |  | (48,335) |  |
| Income (loss) before taxes and redeemable noncontrolling interests |  |  |  |  |  |  | (1,218,835) |  |
| Income tax benefit (expense) |  |  |  |  | 59,019 |  |  | 59,019 |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | 98,613 |  |  | 98,613 |  |
| Dividends on preference shares |  |  |  |  | (35,375) |  |  | (35,375) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | (1,096,578) |  |
| Net claims and claim expenses incurred – current accident year | $ | 2,250,512 |  |  | $ | 2,335,910 |  |  | $ | — |  |  | $ | 4,586,422 |  |
| Net claims and claim expenses incurred – prior accident years | (205,741) |  |  | (41,841) |  |  | — |  |  | (247,582) |  |
| Net claims and claim expenses incurred – total | $ | 2,044,771 |  |  | $ | 2,294,069 |  |  | $ | — |  |  | $ | 4,338,840 |  |
| Net claims and claim expense ratio – current accident year | 81.2 | % |  | 65.5 | % |  |  |  | 72.4 | % |
| Net claims and claim expense ratio – prior accident years | (7.4) | % |  | (1.1) | % |  |  |  | (3.9) | % |
| Net claims and claim expense ratio – calendar year | 73.8 | % |  | 64.4 | % |  |  |  | 68.5 | % |
| Underwriting expense ratio | 26.8 | % |  | 30.9 | % |  |  |  | 29.2 | % |
| Combined ratio | 100.6 | % |  | 95.3 | % |  |  |  | 97.7 | % |
| Year ended December 31, 2021 | Property |  | Casualty and Specialty |  | Other |  | Total |
| Gross premiums written | $ | 3,958,724 |  |  | $ | 3,875,074 |  |  | $ | — |  |  | $ | 7,833,798 |  |
| Net premiums written | $ | 2,868,002 |  |  | $ | 3,071,373 |  |  | $ | — |  |  | $ | 5,939,375 |  |
| Net premiums earned | $ | 2,608,298 |  |  | $ | 2,585,883 |  |  | $ | — |  |  | $ | 5,194,181 |  |
| Net claims and claim expenses incurred | 2,163,016 |  |  | 1,713,071 |  |  | — |  |  | 3,876,087 |  |
| Acquisition expenses | 487,178 |  |  | 727,680 |  |  | — |  |  | 1,214,858 |  |
| Operational expenses | 143,608 |  |  | 68,576 |  |  | — |  |  | 212,184 |  |
| Underwriting income (loss) | $ | (185,504) |  |  | $ | 76,556 |  |  | $ | — |  |  | (108,948) |  |
| Net investment income |  |  |  |  | 319,479 |  |  | 319,479 |  |
| Net foreign exchange gains (losses) |  |  |  |  | (41,006) |  |  | (41,006) |  |
| Equity in earnings of other ventures |  |  |  |  | 12,309 |  |  | 12,309 |  |
| Other income (loss) |  |  |  |  | 10,880 |  |  | 10,880 |  |
| Net realized and unrealized gains (losses) on investments |  |  |  |  | (218,134) |  |  | (218,134) |  |
| Corporate expenses |  |  |  |  | (41,152) |  |  | (41,152) |  |
| Interest expense |  |  |  |  | (47,536) |  |  | (47,536) |  |
| Income (loss) before taxes and redeemable noncontrolling interests |  |  |  |  |  |  | (114,108) |  |
| Income tax benefit (expense) |  |  |  |  | 10,668 |  |  | 10,668 |  |
| Net (income) loss attributable to redeemable noncontrolling interests |  |  |  |  | 63,285 |  |  | 63,285 |  |
| Dividends on preference shares |  |  |  |  | (33,266) |  |  | (33,266) |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders |  |  |  |  |  |  | $ | (73,421) |  |
| Net claims and claim expenses incurred – current accident year | $ | 2,396,389 |  |  | $ | 1,729,168 |  |  | $ | — |  |  | $ | 4,125,557 |  |
| Net claims and claim expenses incurred – prior accident years | (233,373) |  |  | (16,097) |  |  | — |  |  | (249,470) |  |
| Net claims and claim expenses incurred – total | $ | 2,163,016 |  |  | $ | 1,713,071 |  |  | $ | — |  |  | $ | 3,876,087 |  |
| Net claims and claim expense ratio – current accident year | 91.9 | % |  | 66.9 | % |  |  |  | 79.4 | % |
| Net claims and claim expense ratio – prior accident years | (9.0) | % |  | (0.7) | % |  |  |  | (4.8) | % |
| Net claims and claim expense ratio – calendar year | 82.9 | % |  | 66.2 | % |  |  |  | 74.6 | % |
| Underwriting expense ratio | 24.2 | % |  | 30.8 | % |  |  |  | 27.5 | % |
| Combined ratio | 107.1 | % |  | 97.0 | % |  |  |  | 102.1 | % |
Schedule of Gross Premiums Written Allocated to the Territory of Coverage Exposure | The following is a summary of the Company’s gross premiums written allocated to the territory of coverage exposure:
| Year ended December 31, | 2023 |  | 2022 |  | 2021 |
| Property |  |  |  |  |  |
| U.S. and Caribbean | $ | 2,303,013 |  |  | $ | 2,343,830 |  |  | $ | 2,257,088 |  |
| Worldwide | 798,623 |  |  | 1,053,369 |  |  | 1,188,737 |  |
| Europe | 163,500 |  |  | 62,998 |  |  | 253,678 |  |
| Japan | 85,823 |  |  | 104,767 |  |  | 114,981 |  |
| Worldwide (excluding U.S.) (1) | 70,646 |  |  | 37,436 |  |  | 34,742 |  |
| Australia and New Zealand | 70,107 |  |  | 86,080 |  |  | 69,188 |  |
| Other | 70,702 |  |  | 45,761 |  |  | 40,310 |  |
| Total Property | 3,562,414 |  |  | 3,734,241 |  |  | 3,958,724 |  |
| Casualty and Specialty |  |  |  |  |  |
| U.S. and Caribbean | 2,333,096 |  |  | 2,556,466 |  |  | 1,721,663 |  |
| Worldwide | 2,280,687 |  |  | 2,328,030 |  |  | 1,746,450 |  |
| Europe | 197,228 |  |  | 327,831 |  |  | 217,721 |  |
| Worldwide (excluding U.S.) (1) | 130,334 |  |  | 177,746 |  |  | 108,376 |  |
| Australia and New Zealand | 27,397 |  |  | 35,973 |  |  | 29,001 |  |
| Other | 331,210 |  |  | 53,253 |  |  | 51,863 |  |
| Total Casualty and Specialty | 5,299,952 |  |  | 5,479,299 |  |  | 3,875,074 |  |
| Total gross premiums written | $ | 8,862,366 |  |  | $ | 9,213,540 |  |  | $ | 7,833,798 |  |
(1)The category “Worldwide (excluding U.S.)” consists of contracts that cover more than one geographic region (other than the U.S.).

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-41 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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