| Cover | Dec. 05, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 05, 2023 |
| Entity Registrant Name | Hamilton Insurance Group, Ltd. |
| Entity Incorporation, State or Country Code | D0 |
| Entity File Number | 001-41862 |
| Entity Tax Identification Number | 98-1153847 |
| Entity Address, Address Line One | Wellesley House North, 1st Floor |
| Entity Address, Address Line Two | 90 Pitts Bay Road |
| Entity Address, City or Town | Pembroke |
| Entity Address, Country | BM |
| Entity Address, Postal Zip Code | HM 08 |
| City Area Code | 441 |
| Local Phone Number | 405-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class B common shares, par value $0.01 per share |
| Trading Symbol | HG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001593275 |
