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BENEFIT PLANS (Additional Information) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) plan shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 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 | $ 722,300,000 | $ 685,300,000 |
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 | $ 29,700,000 | 27,100,000 | $ 23,200,000
Accrued incentive compensations | $ 44,900,000 | $ 90,000,000 |
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 | $ 10,700,000 | 12,300,000 |
Real Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Commitments related to investments | 500,000 | 500,000 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 5,900,000 | 5,200,000 |
Pension Benefits | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan percentage of employees covered | 15.00% |  |
Employer contributions | $ 0 | 0 |
Pension plans investment return | 17.90% |  |
Defined benefit plan expected return | 7.25% |  |
Expected return on plan assets for 2018 | 7.25% |  |
Pension Benefits | Canada |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contributions | $ 1,500,000 | 800,000 |
Pension plans investment return | 7.80% |  |
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 | $ 2,200,000 | 2,600,000 |
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 | 675,200,000 | 643,400,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation | 673,100,000 | 641,600,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets | $ 510,900,000 | $ 468,300,000 |
Initial annual rate increase in the per capita cost of covered healthcare benefits | 6.70% | 7.00% |
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 | $ 56,400,000 | $ 50,200,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation | 49,200,000 | 43,700,000 |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets | $ 50,200,000 | 47,000,000 |
Initial annual rate increase in the per capita cost of covered healthcare benefits | 5.50% |  |
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits | 5.00% |  |
Other Postretirement Benefit Plans | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cost recognized | $ 7,300,000 | $ 5,900,000 | $ 700,000

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- Definition Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 + Details
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