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

STOCK-BASED COMPENSATION (Total Stock-Based Compensation Expense) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense, before income taxes	$ 38.1us-gaap_ShareBasedCompensation	$ 32.2us-gaap_ShareBasedCompensation	$ 28.0us-gaap_ShareBasedCompensation
Cost of services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense, before income taxes	4.6	4.2	3.9
Selling, general and administrative expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense, before income taxes	$ 33.5	$ 28.0	$ 24.1