Equifax Inc. Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Remaining Performance Obligation (Details) $ in Millions	Jun. 30, 2018 USD ($)
Revenue Recognition and Deferred Revenue [Abstract]
Total remaining performance obligation	$ 214.9
Performance obligation period
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue Recognition and Deferred Revenue [Abstract]
Total remaining performance obligation	$ 51.1
Performance obligation period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue Recognition and Deferred Revenue [Abstract]
Total remaining performance obligation	$ 69.2
Performance obligation period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue Recognition and Deferred Revenue [Abstract]
Total remaining performance obligation	$ 62.6
Performance obligation period	2 years