| Cover | Jun. 30, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 30, 2022 |
| Entity Registrant Name | Enact Holdings, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40399 |
| Entity Tax Identification Number | 46-1579166 |
| Entity Address, Address Line One | 8325 Six Forks Road |
| Entity Address, City or Town | Raleigh |
| Entity Address, State or Province | NC |
| Entity Address, Postal Zip Code | 27615 |
| City Area Code | 919 |
| Local Phone Number | 846-4100 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.01 per share |
| Trading Symbol | ACT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001823529 |
| Amendment Flag | false |
