| Document and Entity Information Document | Sep. 30, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 30, 2021 |
| Entity Registrant Name | FLEETCOR Technologies, Inc. |
| Entity Central Index Key | 0001175454 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35004 |
| Entity Tax Identification Number | 72-1074903 |
| Entity Address, Address Line One | 3280 Peachtree Road, Suite 2400 |
| Entity Address, City or Town | Atlanta |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30305 |
| City Area Code | 770 |
| Local Phone Number | 449-0479 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | FLT |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
