Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Narrative (Details)

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BENEFIT PLANS - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
plan
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of executive defined benefit pension plans | plan 2    
Number of executive retirement programs | plan 2    
Accumulated benefit obligation $ 712.4 $ 659.8  
Difference between actual returns and expected returns rate over five years period 20.00%    
Hedge funds, minimum number of days notice prior to redemption 30 days    
Hedge funds, maximum number of days notice prior to redemption 90 days    
Cost recognized $ 26.9 30.7 $ 29.7
Accrued incentive compensations $ 77.7 $ 61.7  
Stock held by employee benefits trusts, shares (in shares) | shares 600,000 600,000  
Equifax stock included in Employee Benefit Trusts at cost $ 5.9 $ 5.9  
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Discretionary match of participants' contributions, dependent on certain eligibility rules 500.00%    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Discretionary match of participants' contributions, dependent on certain eligibility rules 600.00%    
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 6.0 36.3  
Pension Benefits | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan percentage of employees covered 11.00%    
Employer contributions $ 0.0 30.0  
Pension plans investment return 21.40%    
Defined benefit plan expected return 6.70%    
Expected return on plan assets for 2020 6.50%    
Pension Benefits | Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 0.2 0.4  
Pension plans investment return 12.70%    
Defined benefit plan expected return 6.00%    
Expected return on plan assets for 2020 6.00%    
Other Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 1.6 1.9  
Plan assets in excess of projected benefit obligation and accumulated benefit obligation, plan assets 554.0    
Plan assets in excess of projected benefit obligation and accumulated benefit obligation, projected benefit obligation 552.9    
Plan assets in excess of projected benefit obligation and accumulated benefit obligation, accumulated benefit obligation 552.9    
Other Postretirement Benefit Plans | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation 108.4 615.7  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation $ 108.3 615.6  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets   488.8  
Initial annual rate increase in the per capita cost of covered healthcare benefits 6.50%    
Ultimate annual rate decrease in the per capita cost of covered healthcare benefits 5.00%    
Other Postretirement Benefit Plans | Foreign Plan      
Defined Benefit Plan Disclosure [Line Items]      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation $ 58.7 50.3  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation 51.2 44.3  
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets $ 49.3 45.0  
Initial annual rate increase in the per capita cost of covered healthcare benefits 5.00%    
Cost recognized $ 13.9 $ 14.1 $ 7.3