Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS AND INVESTMENTS ACQUISITIONS AND INVESTMENTS (Pro Forma Financial Information) (Details)

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ACQUISITIONS AND INVESTMENTS ACQUISITIONS AND INVESTMENTS (Pro Forma Financial Information) (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
As Reported                      
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
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
Net income per share (basic) (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
Net income per share (diluted) (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
Veda                      
As Reported                      
Operating revenue                 $ 3,144.9 $ 2,663.6  
Net income attributable to Equifax                 $ 488.8 $ 429.1  
Net income per share (basic) (in dollars per share)                 $ 4.10 $ 3.61  
Net income per share (diluted) (in dollars per share)                 $ 4.04 $ 3.55  
Pro Forma                      
Operating revenues                 $ 3,180.9 $ 2,929.0  
Net income attributable to Equifax                 $ 488.1 $ 429.9  
Net income per share (basic) (in dollars per share)                 $ 4.09 $ 3.62  
Net income per share (diluted) (in dollars per share)                 $ 4.03 $ 3.56  
[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.