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Cover - shares
 6 Months Ended
Jun. 30, 2026
Jul. 31, 2026
Document 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 001-39313  
Entity Registrant Name SHIFT4 PAYMENTS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-3676340  
Entity Address, Address Line One 3501 Corporate Parkway  
Entity Address, City or Town Center Valley  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 18034  
City Area Code 888  
Local Phone Number 276-2108  
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   78,960,120
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001794669  
Current Fiscal Year End Date --12-31  
Class A Common Stock    
Document Information [Line Items]    
Title of 12(b) Security Class A Common Stock, $0.0001 par value per share  
Trading Symbol FOUR  
Security Exchange Name NYSE  
Series A Mandatory Convertible Preferred Stock    
Document Information [Line Items]    
Title of 12(b) Security Series A Mandatory Convertible Preferred Stock, $0.0001 par value per share  
Trading Symbol FOUR.PRA  
Security Exchange Name NYSE