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Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Feb. 26, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 739
Entity Common Stock, Shares Outstanding   159,108,759  
Documents Incorporated by Reference
Certain portions of the registrant’s definitive proxy statement pursuant to Regulation 14A of the Securities Exchange Act of 1934 in connection with the 2023 annual meeting of the registrant’s stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K.
   
Entity Central Index Key 0001823529    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false