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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 26, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-42634    
Entity Registrant Name American Integrity Insurance Group, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 33-2925846    
Entity Address, Address Line One 5426 Bay Center Drive    
Entity Address, Address Line Two Suite 600    
Entity Address, City or Town Tampa    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33609    
City Area Code 813    
Local Phone Number 880-7000    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol AII    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   19,579,009  
Entity Public Float     $ 155.9
Documents Incorporated by Reference The information required by Part III of this Annual Report on Form 10-K is incorporated by reference from the Company’s Definitive Proxy Statement on
Schedule 14A relating to our 2026 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days
after the end of the fiscal year to which this Annual Report on Form 10-K relates.
    
Entity Central Index Key 0002007587    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false