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BENEFIT PLANS - Narrative (Details) $ in Millions | 12 Months Ended
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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

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