Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Additional Information) (Details)

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BENEFIT PLANS (Additional Information) (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
plan
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Sep. 30, 2014
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Number of executive defined benefit pension plans | plan 2      
Defined benefit plan increase to the service benefit       9.00%
Cost recognized $ 27,100,000 $ 23,200,000 $ 20,700,000  
Number of executive retirement programs | plan 2      
Accumulated benefit obligation $ 685,300,000 653,800,000    
Pension plans investment return 6.80%      
Defined benefit plan expected return 7.25%      
Difference between actual returns and expected returns rate over five years period 20.00%      
Accrued incentive compensations $ 90,000,000 $ 83,100,000    
Stock held by employee benefits trusts, shares (in shares) | shares 600,000 600,000.0    
Equifax stock included in Employee Benefit Trusts at cost $ 5,900,000 $ 5,900,000    
Defined Benefit Plan, Narrative Description of Basis Used to Determine Overall Expected Long-term Rate-of-Return on Assets Assumption
The market-related value of assets recognizes the difference between actual returns and expected returns over five years
      
Minimum        
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Discretionary match of participants' contributions, dependent on certain eligibility rules 400.00%      
Maximum        
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Discretionary match of participants' contributions, dependent on certain eligibility rules 600.00%      
U.S. Defined Benefit Plans        
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Defined benefit plan percentage of employees covered 15.00%      
U.S. Postretirement Benefit Plans        
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Employer contributions $ 0 0    
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation 643,400,000 613,100,000    
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation 641,600,000 611,100,000    
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets $ 468,300,000 474,600,000    
Expected return on plan assets for 2017 7.25%      
Initial annual rate increase in the per capita cost of covered healthcare benefits 7.00%      
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits 5.00%      
Foreign Postretirement Benefit Plans        
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Employer contributions $ 800,000 200,000    
Cost recognized 5,900,000 700,000 800,000  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation 50,200,000 49,600,000    
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation 43,700,000 42,700,000    
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets $ 47,000,000 44,300,000    
Pension plans investment return 7.60%      
Defined benefit plan expected return 6.00%      
Expected return on plan assets for 2017 6.00%      
Initial annual rate increase in the per capita cost of covered healthcare benefits 6.00%      
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits 5.00%      
Employer contributions to retirement income plan, certain employees $ 0 0 $ 0  
Other Postretirement Benefit Plans        
Weighted-average assumptions used to determine net periodic benefit cost at December 31,        
Benefits paid 3,200,000 2,400,000    
Employer contributions $ 2,600,000 $ 1,800,000