Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (Quarterly Financial Data) (Detail)

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QUARTERLY FINANCIAL DATA (Quarterly Financial Data) (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenue $ 666.3 $ 667.4 $ 678.1 $ 651.8 $ 624.6 $ 613.4 $ 613.9 $ 584.5 $ 2,663.6 $ 2,436.4 $ 2,303.9
Operating income 176.9 174.3 188.5 154.2 165.2 153.7 167.4 151.9 693.9 638.2 611.2
Consolidated net income 113.0 119.7 112.5 89.6 98.8 94.4 94.5 86.3 434.8 374.0 359.9
Net income attributable to Equifax $ 111.9 $ 117.9 $ 111.0 $ 88.3 $ 98.0 $ 92.7 $ 92.8 $ 83.9 $ 429.1 $ 367.4 $ 351.8
Basic earnings per share                      
Net income attributable to Equifax $ 0.94 $ 1.00 $ 0.94 $ 0.74 $ 0.82 $ 0.77 $ 0.76 $ 0.69 $ 3.61 $ 3.03 $ 2.90
Diluted earnings per common share                      
Net income attributable to Equifax $ 0.93 $ 0.98 $ 0.92 $ 0.73 $ 0.80 $ 0.75 $ 0.75 $ 0.67 $ 3.55 $ 2.97 $ 2.84