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BENEFIT PLANS - Narrative (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 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 | $ 659,800,000 | $ 722,300,000 |
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 | $ 30,700,000 | 29,700,000 | $ 27,100,000
Accrued incentive compensations | $ 61,700,000 | $ 44,900,000 |
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 |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discretionary match of participants' contributions, dependent on certain eligibility rules | 400.00% |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discretionary match of participants' contributions, dependent on certain eligibility rules | 600.00% |  |
Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Commitments related to investments | $ 9,900,000 | 10,700,000 |
Real Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Commitments related to investments | 100,000 | 500,000 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 36,300,000 | 5,900,000 |
Pension Benefits | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan percentage of employees covered | 12.00% |  |
Employer contributions | $ 30,000,000 | 0 |
Pension plans investment return | 3.20% |  |
Defined benefit plan expected return | 7.25% |  |
Expected return on plan assets for 2018 | 6.70% |  |
Pension Benefits | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 400,000 | 1,500,000 |
Pension plans investment return | 1.30% |  |
Defined benefit plan expected return | 6.00% |  |
Expected return on plan assets for 2018 | 6.00% |  |
Other Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 1,900,000 | 2,200,000 |
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 | 615,700,000 | 675,200,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation | 615,600,000 | 673,100,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets | $ 488,800,000 | 510,900,000 |
Initial annual rate increase in the per capita cost of covered healthcare benefits | 6.70% |  |
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits | 5.00% |  |
Other Postretirement Benefit Plans | Canada |  |  |
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 | $ 50,300,000 | 56,400,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation | 44,300,000 | 49,200,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets | $ 45,000,000 | 50,200,000 |
Initial annual rate increase in the per capita cost of covered healthcare benefits | 5.00% |  |
Other Postretirement Benefit Plans | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cost recognized | $ 14,100,000 | $ 7,300,000 | $ 5,900,000

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