Quarterly report pursuant to Section 13 or 15(d)

Cover

v3.21.2
Cover - shares
 9 Months Ended
Sep. 30, 2021
Oct. 08, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2021  
Document Transition Report false  
Entity File Number 001-06605  
Entity Registrant Name EQUIFAX INC  
Entity Incorporation, State or Country Code GA  
Entity Tax Identification Number 58-0401110  
Entity Address, Address Line One 1550 Peachtree Street  
Entity Address, Address Line Two N.W.  
Entity Address, City or Town Atlanta  
Entity Address, State or Province GA  
Entity Address, Postal Zip Code 30309  
City Area Code 404  
Local Phone Number 885-8000  
Title of 12(b) Security Common stock, $1.25 par value per share  
Trading Symbol EFX  
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   122,001,519
Amendment Flag false  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0000033185  
Current Fiscal Year End Date --12-31