Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Detail)

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Quarterly Financial Data (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Financial Information [Line Items]                      
Operating revenue $ 509.7 $ 490.4 $ 487.1 $ 472.6 $ 482.0 $ 473.8 $ 460.7 $ 443.0 $ 1,959.8 $ 1,859.5 $ 1,716.0
Operating income 125.7 121.6 114.6 109.1 109.7 110.2 105.8 104.3 471.0 430.0 381.8
Consolidated income from continuing operations 74.5 69.3 37.1 59.3 64.0 63.6 59.8 55.9 240.2 243.3 224.4
Discontinued operations, net of tax 1.5         15.2 13.6 2.7 1.5 31.5 16.1
Consolidated net income 76.0 69.3 37.1 59.3 64.0 78.8 73.4 58.6 241.7 274.8 240.5
Net income attributable to Equifax $ 74.4 $ 66.7 $ 34.5 $ 57.3 $ 62.2 $ 76.5 $ 71.3 $ 56.7 $ 232.9 $ 266.7 $ 233.9
Basic earnings per common share                      
Net income from continuing operations attributable to Equifax $ 0.61 $ 0.55 $ 0.28 $ 0.47 $ 0.51 $ 0.50 $ 0.46 $ 0.43 $ 1.90 $ 1.89 $ 1.72
Discontinued operations attributable to Equifax $ 0.01         $ 0.12 $ 0.11 $ 0.02 $ 0.01 $ 0.25 $ 0.13
Net income attributable to Equifax $ 0.62 [1] $ 0.55 [1] $ 0.28 [1] $ 0.47 [1] $ 0.51 [1] $ 0.62 [1] $ 0.57 [1] $ 0.45 [1] $ 1.91 $ 2.14 $ 1.85
Diluted earnings per common share                      
Net income from continuing operations attributable to Equifax $ 0.60 $ 0.54 $ 0.28 $ 0.46 $ 0.50 $ 0.49 $ 0.45 $ 0.42 $ 1.87 $ 1.86 $ 1.70
Discontinued operations attributable to Equifax $ 0.01         $ 0.12 $ 0.11 $ 0.02 $ 0.01 $ 0.25 $ 0.13
Net income attributable to Equifax $ 0.61 [1] $ 0.54 [1] $ 0.28 [1] $ 0.46 [1] $ 0.50 [1] $ 0.61 [1] $ 0.56 [1] $ 0.44 [1] $ 1.88 $ 2.11 $ 1.83
[1] The sum of the quarterly EPS does not equal the annual EPS due to changes in the weighted-average shares between periods.