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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings Per Common Share | The following table sets forth the computation of basic and diluted earnings per common share:
| Year ended December 31, | 2021 |  | 2020 |  | 2019 |
| (common shares in thousands) |  |  |  |  |  |
| Numerator: |  |  |  |  |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders | $ | (73,421) |  |  | $ | 731,482 |  |  | $ | 712,042 |  |
| Amount allocated to participating common shareholders (1) | (727) |  |  | (8,968) |  |  | (8,545) |  |
| Net income (loss) allocated to RenaissanceRe common shareholders | $ | (74,148) |  |  | $ | 722,514 |  |  | $ | 703,497 |  |
| Denominator: |  |  |  |  |  |
| Denominator for basic income (loss) per RenaissanceRe common share - weighted average common shares | 47,171 |  |  | 47,103 |  |  | 43,119 |  |
| Per common share equivalents of non-vested shares | — |  |  | 75 |  |  | 56 |  |
| Denominator for diluted income (loss) per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 47,171 |  |  | 47,178 |  |  | 43,175 |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – basic | $ | (1.57) |  |  | $ | 15.34 |  |  | $ | 16.32 |  |
| Net income (loss) available (attributable) to RenaissanceRe common shareholders per common share – diluted | $ | (1.57) |  |  | $ | 15.31 |  |  | $ | 16.29 |  |
(1)Represents earnings and dividends attributable to holders of unvested shares issued pursuant to the Company's stock compensation plans.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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