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

REVENUE - Disaggregation of Revenue (Details)

REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Operating revenue	$ 865.7	$ 832.2
Change in revenue	$ 33.5
Operating revenue	4.00%
Operating Segments \| U.S. Information Solutions
Disaggregation of Revenue [Line Items]
Operating revenue	$ 306.9	310.1
Change in revenue	$ (3.2)
Operating revenue	(1.00%)
Operating Segments \| U.S. Information Solutions \| Online Information Solutions
Disaggregation of Revenue [Line Items]
Operating revenue	$ 219.7	225.2
Change in revenue	$ (5.5)
Operating revenue	(2.00%)
Operating Segments \| U.S. Information Solutions \| Mortgage Solutions
Disaggregation of Revenue [Line Items]
Operating revenue	$ 41.7	38.6
Change in revenue	$ 3.1
Operating revenue	8.00%
Operating Segments \| U.S. Information Solutions \| Financial Marketing Services
Disaggregation of Revenue [Line Items]
Operating revenue	$ 45.5	46.3
Change in revenue	$ (0.8)
Operating revenue	(2.00%)
Operating Segments \| International
Disaggregation of Revenue [Line Items]
Operating revenue	$ 244.5	216.2
Change in revenue	$ 28.3
Operating revenue	13.00%
Operating Segments \| International \| Asia Pacific
Disaggregation of Revenue [Line Items]
Operating revenue	$ 82.4	72.0
Change in revenue	$ 10.4
Operating revenue	14.00%
Operating Segments \| International \| Europe
Disaggregation of Revenue [Line Items]
Operating revenue	$ 70.6	61.7
Change in revenue	$ 8.9
Operating revenue	15.00%
Operating Segments \| International \| Latin America
Disaggregation of Revenue [Line Items]
Operating revenue	$ 56.0	51.0
Change in revenue	$ 5.0
Operating revenue	10.00%
Operating Segments \| International \| Canada
Disaggregation of Revenue [Line Items]
Operating revenue	$ 35.5	31.5
Change in revenue	$ 4.0
Operating revenue	13.00%
Operating Segments \| Workforce Solutions
Disaggregation of Revenue [Line Items]
Operating revenue	$ 211.1	200.0
Change in revenue	$ 11.1
Operating revenue	6.00%
Operating Segments \| Workforce Solutions \| Verification Services
Disaggregation of Revenue [Line Items]
Operating revenue	$ 128.4	115.1
Change in revenue	$ 13.3
Operating revenue	12.00%
Operating Segments \| Workforce Solutions \| Employer Services
Disaggregation of Revenue [Line Items]
Operating revenue	$ 82.7	84.9
Change in revenue	$ (2.2)
Operating revenue	(3.00%)
Operating Segments \| Global Consumer Solutions
Disaggregation of Revenue [Line Items]
Operating revenue	$ 103.2	$ 105.9
Change in revenue	$ (2.7)
Operating revenue	(3.00%)