Annual report pursuant to Section 13 and 15(d)

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

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ACQUISITIONS AND INVESTMENTS (Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
As Reported                      
Operating revenues $ 838.5 $ 834.8 $ 856.7 $ 832.2 $ 801.1 $ 804.1 $ 811.3 $ 728.3 $ 3,362.2 $ 3,144.9 $ 2,663.6
Net income attributable to Equifax $ 172.3 $ 96.3 $ 165.4 $ 153.3 $ 123.0 $ 132.8 $ 130.9 $ 102.1 $ 587.3 $ 488.8 $ 429.1
Net income per share (basic) (in dollars per share) $ 1.44 $ 0.80 $ 1.37 $ 1.28 $ 1.03 $ 1.11 $ 1.10 $ 0.86 $ 4.89 $ 4.10 $ 3.61
Net income per share (diluted) (in dollars per share) $ 1.42 $ 0.79 $ 1.36 $ 1.26 $ 1.01 $ 1.09 $ 1.08 $ 0.85 $ 4.83 $ 4.04 $ 3.55
Veda                      
As Reported                      
Operating revenues                   $ 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