Quarterly report pursuant to Section 13 or 15(d)

REVENUE - Impact of ASU 2014-09 (Details)

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REVENUE - Impact of ASU 2014-09 (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Statement          
Operating revenue $ 876.9 $ 856.7 $ 1,742.6 $ 1,689.0  
Consolidated income from operations before income taxes 169.4 242.6 292.6 438.3  
Consolidated net income 146.1 167.6 240.0 323.0  
Net income attributable to Equifax $ 144.8 $ 165.4 $ 235.8 $ 318.7  
Basic earnings per common share:          
Net income attributable to Equifax (in dollars per share) $ 1.20 $ 1.37 $ 1.96 $ 2.65  
Diluted earnings per common share:          
Net income attributable to Equifax (in dollars per share) $ 1.19 $ 1.36 $ 1.94 $ 2.61  
Change in %          
Operating revenue 2.00%   3.00%    
Balance Sheet          
Other current assets $ 60.2   $ 60.2   $ 122.9
Other assets, net 146.0   146.0   142.0
Total assets 7,116.9   7,116.9   7,233.4
Deferred income tax liabilities, net 293.2   293.2   305.1
Total liabilities 3,837.2   3,837.2   3,994.4
Retained earnings 4,748.3   4,748.3   4,600.6
Total equity 3,279.7   3,279.7   3,239.0
Total liabilities and equity $ 7,116.9   $ 7,116.9   $ 7,233.4
Accounting Standards Update 2014-09          
Change in %          
Operating revenue 0.00%   0.00%    
Consolidated income from operations before income taxes 0.00%   0.00%    
Consolidated net income 0.00%   0.00%    
Net income attributable to Equifax 0.00%   0.00%    
Basic earnings per common share:          
Net income attributable to Equifax 0.00%   1.00%    
Diluted earnings per common share:          
Net income attributable to Equifax 0.00%   0.00%    
Change in %          
Other current assets     0.00%    
Other assets, net     4.00%    
Total assets     0.00%    
Deferred income tax liabilities, net     0.00%    
Total liabilities     0.00%    
Retained earnings     0.00%    
Total equity     0.00%    
Total liabilities and equity     0.00%    
Prior to ASU 2014-09 adoption          
Income Statement          
Operating revenue $ 876.5   $ 1,741.6    
Consolidated income from operations before income taxes 169.0   291.6    
Consolidated net income 145.8   239.3    
Net income attributable to Equifax $ 144.5   $ 235.1    
Basic earnings per common share:          
Net income attributable to Equifax (in dollars per share) $ 1.20   $ 1.95    
Diluted earnings per common share:          
Net income attributable to Equifax (in dollars per share) $ 1.19   $ 1.94    
Balance Sheet          
Other current assets $ 60.0   $ 60.0    
Other assets, net 139.8   139.8    
Total assets 7,110.5   7,110.5    
Deferred income tax liabilities, net 291.8   291.8    
Total liabilities 3,835.8   3,835.8    
Retained earnings 4,743.3   4,743.3    
Total equity 3,274.7   3,274.7    
Total liabilities and equity 7,110.5   7,110.5    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09          
Income Statement          
Operating revenue 0.4   1.0    
Consolidated income from operations before income taxes 0.4   1.0    
Consolidated net income 0.3   0.7    
Net income attributable to Equifax $ 0.3   $ 0.7    
Basic earnings per common share:          
Net income attributable to Equifax (in dollars per share) $ 0.00   $ 0.01    
Diluted earnings per common share:          
Net income attributable to Equifax (in dollars per share) $ 0.00   $ 0.00    
Balance Sheet          
Other current assets $ 0.2   $ 0.2    
Other assets, net 6.2   6.2    
Total assets 6.4   6.4    
Deferred income tax liabilities, net 1.4   1.4    
Total liabilities 1.4   1.4    
Retained earnings 5.0   5.0    
Total equity 5.0   5.0    
Total liabilities and equity $ 6.4   $ 6.4