Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Additional Information) (Detail)

v3.3.1.900
BENEFIT PLANS (Additional Information) (Detail)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 21, 2012
USD ($)
participant
Dec. 31, 2016
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Sep. 30, 2015
Dec. 31, 2012
participant
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan, Number of Vested Participants | participant             3,500
Percentage of Employees Received Lump Sum Payment 64.00%            
Benefits paid $ 62.6            
Defined Benefit Plan, Number of Vested Participants Who Elected The Monthly Annuity | participant 90            
Defined Benefit Plan Increase To The Service Benefit           9.00%  
Employer contributions to retirement income plan     $ 23.9 $ 21.5 $ 21.3    
Accumulated benefit obligation     $ 653.8 727.8      
Pension Plans investment return     1.10%        
Defined benefit plan expected return     7.50%        
Difference between actual returns and expected returns rate over five years period     20.00%        
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
        
Accrued incentive compensations     $ 83.1 $ 60.7      
Stock held by employee benefits trusts, shares | shares     0.6 0.6      
Shares of Equifax stock included in Employee Benefit Trusts at cost     $ 5.9 $ 5.9      
U.S. Defined Benefit Plans              
Defined Benefit Plan Disclosure [Line Items]              
Defined Benefit Plan Percentage Of Employees Covered     20.00%        
U.S. Retirement Income Plan, or USRIP              
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     $ 613.1 679.5      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation     611.1 676.8      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets     $ 474.6 515.6      
Initial annual rate increase in the per capita cost of of covered healthcare benefits     7.00%        
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits     5.00%        
Defined Benefit Plan, Expected Return On Plan Assets Percentage   7.30%          
Canadian Retirement Income Plan, or CRIP              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions to retirement income plan     $ 0.2 1.2      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation     49.6 59.6      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation     42.7 51.0      
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets     $ 44.3 54.5      
Pension Plans investment return     2.90%        
Initial annual rate increase in the per capita cost of of covered healthcare benefits     6.50%        
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits     5.00%        
Defined Benefit Plan, Expected Return On Plan Assets Percentage   6.00% 6.75%        
Other Benefits              
Defined Benefit Plan Disclosure [Line Items]              
Benefits paid     $ 2.4 2.1      
Employer contributions to retirement income plan     $ 1.8 $ 1.6