| Cover Document | Jun. 03, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 3, 2022 |
| Entity Registrant Name | SIRIUSPOINT LTD. |
| Entity Incorporation, State or Country Code | D0 |
| Entity Tax Identification Number | 98-1599372 |
| Entity Address, Street Address | Point Building |
| Entity Address, Street Address 2 | 3 Waterloo Lane |
| Entity Address, City | Pembroke |
| Entity Address, Postal Zip Code | HM 08 |
| Entity Address, Country | BM |
| City Area Code | 441 |
| Local Phone Number | 542-3300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001576018 |
| Amendment Flag | false |
| Entity File Number | 001-36052 |
| Common Stock | |
| Cover [Abstract] | |
| Title of each class | Common Shares, $0.10 par value |
| Trading Symbol | SPNT |
| Name of each exchange on which registered | NYSE |
| Document Information [Line Items] | |
| Title of each class | Common Shares, $0.10 par value |
| Trading Symbol | SPNT |
| Name of each exchange on which registered | NYSE |
| 8.00% Resettable Fixed Rate Preference Shares, Series B | |
| Cover [Abstract] | |
| Title of each class | 8.00% Resettable Fixed Rate Preference Shares, Series B, $0.10 par value, $25.00 liquidation preference per share |
| Trading Symbol | SPNT PB |
| Name of each exchange on which registered | NYSE |
| Document Information [Line Items] | |
| Title of each class | 8.00% Resettable Fixed Rate Preference Shares, Series B, $0.10 par value, $25.00 liquidation preference per share |
| Trading Symbol | SPNT PB |
| Name of each exchange on which registered | NYSE |
