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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2020
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 |
| (common shares in thousands) | March 31, 2020 |  | March 31, 2019 |
| Numerator: |  |  |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders | $ | (81,974 | ) |  | $ | 273,717 |  |
| Amount allocated to participating common shareholders (1) | (146 | ) |  | (3,121 | ) |
| Net (loss) income allocated to RenaissanceRe common shareholders | $ | (82,120 | ) |  | $ | 270,596 |  |
| Denominator: |  |  |  |
| Denominator for basic (loss) income per RenaissanceRe common share - weighted average common shares | 43,441 |  |  | 42,065 |  |
| Per common share equivalents of employee stock options and non-vested shares | — |  |  | 26 |  |
| Denominator for diluted (loss) income per RenaissanceRe common share - adjusted weighted average common shares and assumed conversions | 43,441 |  |  | 42,091 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – basic | $ | (1.89 | ) |  | $ | 6.43 |  |
| Net (loss) income (attributable) available to RenaissanceRe common shareholders per common share – diluted | $ | (1.89 | ) |  | $ | 6.43 |  |
(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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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