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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes in Amount of Goodwill) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]    
Beginning Balance $ 2,395.1us-gaap_Goodwill [1] $ 2,290.4us-gaap_Goodwill [1]
Acquisitions 240.2us-gaap_GoodwillAcquiredDuringPeriod 55.3us-gaap_GoodwillAcquiredDuringPeriod
Adjustments to initial purchase price allocation 2.1us-gaap_GoodwillPurchaseAccountingAdjustments 87.8us-gaap_GoodwillPurchaseAccountingAdjustments
Foreign currency translation (30.5)us-gaap_GoodwillTranslationAdjustments (8.0)us-gaap_GoodwillTranslationAdjustments
Tax benefits of options exercised (0.1)efx_Goodwilltaxdeductionfromexerciseofstockoptions (0.2)efx_Goodwilltaxdeductionfromexerciseofstockoptions
Businesses sold   (30.2)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Ending Balance 2,606.8us-gaap_Goodwill 2,395.1us-gaap_Goodwill [1]
U.S. Information Solutions    
Goodwill [Roll Forward]    
Beginning Balance 1,054.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 [1] 969.4us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 [1]
Acquisitions 66.4us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Adjustments to initial purchase price allocation 0us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 87.5us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Foreign currency translation 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Tax benefits of options exercised 0efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 0efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Businesses sold   (2.7)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Ending Balance 1,120.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 1,054.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember		 [1]
International    
Goodwill [Roll Forward]    
Beginning Balance 416.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 [1] 385.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 [1]
Acquisitions 173.8us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 40.8us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Adjustments to initial purchase price allocation 2.1us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 (0.1)us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Foreign currency translation (30.5)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 (8.0)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Tax benefits of options exercised 0efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 0efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Businesses sold   (1.4)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Ending Balance 561.9us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 416.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember		 [1]
Workforce Solutions    
Goodwill [Roll Forward]    
Beginning Balance 907.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember		 934.0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
Acquisitions 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember		 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
Adjustments to initial purchase price allocation 0us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember		 0us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
Foreign currency translation 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember		 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
Tax benefits of options exercised (0.1)efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember		 (0.2)efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
Businesses sold   (26.1)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
Ending Balance 907.6us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember		 907.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_TALXMember
North America Personal Solutions    
Goodwill [Roll Forward]    
Beginning Balance 16.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember		 1.8us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Acquisitions 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember		 14.5us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Adjustments to initial purchase price allocation 0us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember		 0.4us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Foreign currency translation 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember		 0us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Tax benefits of options exercised 0efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember		 0efx_Goodwilltaxdeductionfromexerciseofstockoptions
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Businesses sold   0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Ending Balance $ 16.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember		 $ 16.7us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
[1] The December 31, 2013 and 2012 balances have been recast to reflect the new organizational structure. As of December 31, 2013, the USIS and International goodwill include $21.7 million and $15.5 million of goodwill, respectively, from the legacy NACS segment. As of December 31, 2012, the USIS and International goodwill include $21.7 million and $15.9 million of goodwill, respectively, from the legacy NACS segment