Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (UNAUDITED) (Quarterly Financial Data) (Details)

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QUARTERLY FINANCIAL DATA (UNAUDITED) (Quarterly Financial Data) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenue $ 801.1 $ 804.1 $ 811.3 $ 728.3 $ 666.3 $ 667.4 $ 678.1 $ 651.8 $ 3,144.9 $ 2,663.6 $ 2,436.4
Operating income 203.9 212.1 225.7 176.2 176.9 174.3 188.5 154.2 817.9 693.9 638.2
Consolidated net income 124.8 134.9 133.0 102.4 113.0 119.7 112.5 89.6 495.1 434.8 374.0
Net income attributable to Equifax $ 123.0 $ 132.8 $ 130.9 $ 102.1 $ 111.9 $ 117.9 $ 111.0 $ 88.3 $ 488.8 $ 429.1 $ 367.4
Basic earnings per share                      
Net income attributable to Equifax (in dollars per share) $ 1.03 $ 1.11 [1] $ 1.10 [1] $ 0.86 [1] $ 0.94 [1] $ 1.00 [1] $ 0.94 [1] $ 0.74 [1] $ 4.10 $ 3.61 $ 3.03
Diluted earnings per common share                      
Net income attributable to Equifax (in dollars per share) $ 1.01 $ 1.09 [1] $ 1.08 [1] $ 0.85 [1] $ 0.93 [1] $ 0.98 [1] $ 0.92 [1] $ 0.73 [1] $ 4.04 $ 3.55 $ 2.97
[1] The sum of the quarterly EPS does not equal the annual EPS due to changes in the weighted-average shares between periods. Other amounts may not equal the annual total due to rounding between periods.