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Earnings (loss) per share available to SiriusPoint common shareholders (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Schedule of reconciliation of basic and diluted weighted average shares outstanding | The following sets forth the computation of basic and diluted earnings (loss) per share available to SiriusPoint common shareholders for the years ended December 31, 2020, 2019 and 2018:
|  | 2020 |  | 2019 |  | 2018
Weighted-average number of common shares outstanding: | ($ in thousands, except share and per share amounts)
| Basic number of common shares outstanding | 92,510,090 |  |  | 91,835,990 |  |  | 97,054,315 |
| Dilutive effect of options | — |  |  | 125,530 |  |  | — |
| Dilutive effect of warrants | — |  |  | 91,884 |  |  | — |
| Dilutive effect of restricted shares with service and performance condition | 447,709 |  |  | 598,912 |  |  | — |
| Diluted number of common shares outstanding | 92,957,799 |  |  | 92,652,316 |  |  | 97,054,315 |
Basic earnings (loss) per common share: |  |  |  |  |
| Net income (loss) available to SiriusPoint common shareholders | $ | 143,517 |  |  | $ | 200,619 |  |  | $ | (317,692) |
| Net income allocated to SiriusPoint participating common shareholders | (1,106) |  |  | (643) |  |  | — |
| Net income (loss) allocated to SiriusPoint common shareholders | $ | 142,411 |  |  | $ | 199,976 |  |  | $ | (317,692) |
| Basic earnings (loss) per share available to SiriusPoint common shareholders | $ | 1.54 |  |  | $ | 2.18 |  |  | $ | (3.27) |
Diluted earnings (loss) per common share: |  |  |  |  |
| Net income (loss) available to SiriusPoint common shareholders | $ | 143,517 |  |  | $ | 200,619 |  |  | $ | (317,692) |
| Net income allocated to SiriusPoint participating common shareholders | (1,101) |  |  | (637) |  |  | — |
| Net income (loss) allocated to SiriusPoint common shareholders | $ | 142,416 |  |  | $ | 199,982 |  |  | $ | (317,692) |
| Diluted earnings (loss) per share available to SiriusPoint common shareholders | $ | 1.53 |  |  | $ | 2.16 |  |  | $ | (3.27) |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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