v3.26.1
Cover Page - shares
6 Months Ended
Jun. 30, 2026
Aug. 07, 2026
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-42765  
Entity Registrant Name ACCELERANT HOLDINGS  
Entity Incorporation, State or Country Code E9  
Entity Address, Country KY  
Entity Tax Identification Number 98-1753044  
Entity Address, Address Line One Unit 106, Windward 3  
Entity Address, Address Line Two Regatta Office Park  
Entity Address, Address Line Three West Bay Road  
Entity Address, City or Town Grand Cayman  
Entity Address, Postal Zip Code KY1-1108  
City Area Code 345  
Local Phone Number 743-4611  
Title of 12(b) Security Class A common shares, $0.0000011951862 par value per share  
Trading Symbol ARX  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001997350  
Class A common shares    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   118,548,679
Class B common shares    
Entity Information [Line Items]    
Entity Common Stock, Shares Outstanding   98,639,873