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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 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:
|  | Three months ended |  | Nine months ended |
| (common shares in thousands) | September 30, 2021 |  | September 30, 2020 |  | September 30, 2021 |  | September 30, 2020 |
| Numerator: |  |  |  |  |  |  |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders | $ | (450,222) |  |  | $ | 47,799 |  |  | $ | (284,338) |  |  | $ | 541,670 |  |
| Amount allocated to participating common shareholders (1) | (229) |  |  | (582) |  |  | (485) |  |  | (6,677) |  |
| Net (loss) income allocated to RenaissanceRe common shareholders | $ | (450,451) |  |  | $ | 47,217 |  |  | $ | (284,823) |  |  | $ | 534,993 |  |
| Denominator: |  |  |  |  |  |  |  |
| Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares | 46,223 |  |  | 50,009 |  |  | 47,988 |  |  | 46,130 |  |
| Per common share equivalents of non-vested shares | — |  |  | 85 |  |  | — |  |  | 70 |  |
| Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 46,223 |  |  | 50,094 |  |  | 47,988 |  |  | 46,200 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic | $ | (9.75) |  |  | $ | 0.94 |  |  | $ | (5.94) |  |  | $ | 11.60 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted | $ | (9.75) |  |  | $ | 0.94 |  |  | $ | (5.94) |  |  | $ | 11.58 |  |
(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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