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Earnings per share available to SiriusPoint common shareholders (Tables) | 3 Months Ended
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Mar. 31, 2025
Earnings Per Share [Abstract] |
Schedule of Computation of Basic and Diluted Earnings Per Share available to SiriusPoint Common Shareholders | The following sets forth the computation of basic and diluted earnings per share available to SiriusPoint common shareholders for the three months ended March 31, 2025 and 2024:
|  | 2025 |  | 2024 |  |  |  |
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |
| Basic number of common shares outstanding | 115,975,961 |  |  | 168,934,114 |  |  |  |  |
| Dilutive effect of restricted share awards and units | 1,503,925 |  |  | 2,811,088 |  |  |  |  |
| Dilutive effect of options | 1,075,280 |  |  | 1,030,515 |  |  |  |  |
| Dilutive effect of warrants | — |  |  | 1,605,246 |  |  |  |  |
| Diluted number of common shares outstanding | 118,555,166 |  |  | 174,380,963 |  |  |  |  |
Basic earnings per common share: |  |  |  |  |  |  |
| Net income available to SiriusPoint common shareholders | $ | 57.6 |  |  | $ | 90.8 |  |  |  |  |
| Net income allocated to SiriusPoint participating shareholders | (0.1) |  |  | (6.1) |  |  |  |  |
| Net income allocated to SiriusPoint common shareholders | $ | 57.5 |  |  | $ | 84.7 |  |  |  |  |
| Basic earnings per share available to SiriusPoint common shareholders | $ | 0.50 |  |  | $ | 0.50 |  |  |  |  |
Diluted earnings per common share: |  |  |  |  |  |  |
| Net income available to SiriusPoint common shareholders | $ | 57.6 |  |  | $ | 90.8 |  |  |  |  |
| Net income allocated to SiriusPoint participating shareholders | (0.1) |  |  | (6.1) |  |  |  |  |
| Net income allocated to SiriusPoint common shareholders | $ | 57.5 |  |  | $ | 84.7 |  |  |  |  |
| Diluted earnings per share available to SiriusPoint common shareholders | $ | 0.49 |  |  | $ | 0.49 |  |  |  |  |

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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 -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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