v3.25.2
Cover - shares
6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-40399  
Entity Registrant Name Enact Holdings, Inc.  
Entity Incorporation, State or Country Code DE  
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  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol ACT  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   147,505,610
Entity Central Index Key 0001823529  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false