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

GOODWILL AND INTANGIBLE ASSETS (Purchased Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,452.0	$ 1,475.4
Accumulated Amortization	(529.3)	(521.5)
Net	922.7us-gaap_FiniteLivedIntangibleAssetsNet	953.9us-gaap_FiniteLivedIntangibleAssetsNet
Purchased data files
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	672.6	692.0
Accumulated Amortization	(211.8)	(218.8)
Net	460.8	473.2
Acquired software and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	53.0	53.9
Accumulated Amortization	(28.7)	(26.4)
Net	24.3	27.5
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	569.0	570.7
Accumulated Amortization	(210.3)	(204.3)
Net	358.7	366.4
Reacquired rights
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	73.3	73.3
Accumulated Amortization	(29.5)	(26.3)
Net	43.8	47.0
Proprietary database
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	7.4	7.4
Accumulated Amortization	(5.5)	(5.4)
Net	1.9	2.0
Non-compete agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	26.3	27.0
Accumulated Amortization	(13.6)	(11.8)
Net	12.7	15.2
Trade names and other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross	50.4	51.1
Accumulated Amortization	(29.9)	(28.5)
Net	$ 20.5	$ 22.6