v3.26.1
Cover Page - shares
6 Months Ended
Jun. 30, 2026
Jul. 31, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-37403  
Entity Registrant Name Flutter Entertainment plc  
Entity Incorporation, State or Country Code L2  
Entity Tax Identification Number 98-1782229  
Entity Address, Address Line One One Madison Avenue,  
Entity Address, City or Town New York,  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10010  
City Area Code (646)  
Local Phone Number 930-0950  
Title of 12(b) Security Ordinary Shares, nominal value of €0.09 per share  
Trading Symbol FLUT  
Security Exchange Name NYSE  
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   173,539,102
Entity Central Index Key 0001635327  
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2