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
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Statement      
Operating revenue $ 865.7 $ 832.2  
Consolidated income from operations before income taxes 123.2 195.7  
Consolidated net income 93.8 155.4  
Net income attributable to Equifax $ 90.9 $ 153.3  
Basic earnings per common share:      
Net income per share (basic) (in dollars per share) $ 0.76 $ 1.28  
Diluted earnings per common share:      
Diluted earnings per share (in dollars per share) $ 0.75 $ 1.26  
Change in %      
Operating revenue 4.00%    
Balance Sheet      
Other current assets $ 83.0   $ 122.9
Other assets, net 152.3   142.0
Total assets 7,196.1   7,233.4
Deferred income tax liabilities, net 304.9   305.1
Total liabilities 3,859.2   3,994.4
Retained earnings 4,653.1   4,600.6
Total equity 3,336.9   3,239.0
Total liabilities and equity $ 7,196.1   $ 7,233.4
Accounting Standards Update 2014-09      
Change in %      
Operating revenue 0.00%    
Consolidated income from operations before income taxes 0.00%    
Consolidated net income 0.00%    
Net income attributable to Equifax 0.00%    
Basic earnings per common share:      
Net income attributable to Equifax 0.00%    
Diluted earnings per common share:      
Net income attributable to Equifax 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 $ 865.1    
Consolidated income from operations before income taxes 122.6    
Consolidated net income 93.4    
Net income attributable to Equifax $ 90.5    
Basic earnings per common share:      
Net income per share (basic) (in dollars per share) $ 0.76    
Diluted earnings per common share:      
Diluted earnings per share (in dollars per share) $ 0.75    
Balance Sheet      
Other current assets $ 82.7    
Other assets, net 146.6    
Total assets 7,190.1    
Deferred income tax liabilities, net 304.0    
Total liabilities 3,858.3    
Retained earnings 4,648.0    
Total equity 3,331.8    
Total liabilities and equity 7,190.1    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09      
Income Statement      
Operating revenue 0.6    
Consolidated income from operations before income taxes 0.6    
Consolidated net income 0.4    
Net income attributable to Equifax $ 0.4    
Basic earnings per common share:      
Net income per share (basic) (in dollars per share) $ 0.00    
Diluted earnings per common share:      
Diluted earnings per share (in dollars per share) $ 0.00    
Balance Sheet      
Other current assets $ 0.3    
Other assets, net 5.7    
Total assets 6.0    
Deferred income tax liabilities, net 0.9    
Total liabilities 0.9    
Retained earnings 5.1    
Total equity 5.1    
Total liabilities and equity $ 6.0