Equifax Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Additional Information) (Detail)

BENEFIT PLANS (Additional Information) (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended
	Dec. 21, 2012	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Dec. 21, 2012 participant	Nov. 07, 2012	Dec. 31, 2011 participant
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Number of Vested Participants									3,500
Percentage of Employees Received Lump Sum Payment	64.00%
Benefits paid	$ 62.6us-gaap_DefinedBenefitPlanBenefitsPaid
Defined Benefit Plan, Number of Vested Participants Who Elected The Monthly Annuity	90						90
Defined Benefit Plan Increase To The Service Benefit						9.00%		9.00%
Pension Settlement Charge		38.7efx_PensionSettlementCharge	0efx_PensionSettlementCharge	0efx_PensionSettlementCharge	38.7efx_PensionSettlementCharge
Employer contributions to retirement income plan			21.5	21.3	17.8
Accumulated benefit obligation			727.8	623.1
Pension Plans investment return			8.00%
Defined benefit plan expected return			7.50%efx_DefinedBenefitPlanExpectedReturn
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
Prohibited additional investing amounts			The Plan is prohibited from investing additional amounts in Equifax stock once the market value of stock held by each plan exceeds 10% of the total market value of each plan.
Accrued incentive compensations			60.7us-gaap_AccruedEmployeeBenefitsCurrent	51.8us-gaap_AccruedEmployeeBenefitsCurrent
Stock held by employee benefits trusts, 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			679.5	580.1
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation			676.8	575.5
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets			515.6	511.7
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			7.50%
Canadian Retirement Income Plan, or CRIP
Defined Benefit Plan Disclosure [Line Items]
Employer contributions to retirement income plan			1.2	2.6
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation			59.6	56.7
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation			51.0	47.6
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets			54.5	56.4
Pension Plans investment return			9.80%
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			6.75%
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits paid			2.1	3.3
Employer contributions to retirement income plan			$ 1.6	$ 2.2