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

ACQUISITIONS AND INVESTMENTS (Definite-Lived Intangible Assets) (Details)

ACQUISITIONS AND INVESTMENTS (Definite-Lived Intangible Assets) (Details) $ in Millions	Feb. 24, 2016 USD ($)
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 654.6
Acquired finite-lived intangible assets, weighted average useful life	13 years
Customer relationships
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 163.5
Acquired finite-lived intangible assets, weighted average useful life	15 years
Acquired software and technology
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 104.1
Acquired finite-lived intangible assets, weighted average useful life	4 years 3 months 18 days
Purchased data files
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 373.4
Acquired finite-lived intangible assets, weighted average useful life	15 years
Non-compete agreements
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 3.8
Acquired finite-lived intangible assets, weighted average useful life	1 year
Trade names and other intangible assets
Business Acquisition [Line Items]
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles	$ 9.8
Acquired finite-lived intangible assets, weighted average useful life	1 year