| Document and Entity Information | Mar. 17, 2022 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001794669 |
| Document Type | 8-K |
| Document Period End Date | Mar. 17, 2022 |
| Entity Registrant Name | SHIFT4 PAYMENTS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39313 |
| Entity Tax Identification Number | 84-3676340 |
| Entity Address, Address Line One | 2202 N. Irving St. |
| Entity Address, City or Town | Allentown |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 18109 |
| City Area Code | (888) |
| Local Phone Number | 276-2108 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock $0.0001 par value per share |
| Trading Symbol | FOUR |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
