Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits) (Detail)

v2.4.1.9
INCOME TAXES (Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Beginning balance (January 1) $ 19.1us-gaap_UnrecognizedTaxBenefits $ 19.5us-gaap_UnrecognizedTaxBenefits
Increases related to prior year tax positions 3.0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 3.0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Decreases related to prior year tax positions (0.4)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (0.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Increases related to current year tax positions 4.4us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 4.1us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Decreases related to settlements (0.6)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (0.5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Expiration of the statute of limitations for the assessment of taxes (5.3)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations (6.4)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Currency translation adjustment (0.4)efx_UnrecognizedTaxBenefitsIncreasesDecreasesResultingfromForeignCurrencyTranslation (0.5)efx_UnrecognizedTaxBenefitsIncreasesDecreasesResultingfromForeignCurrencyTranslation
Ending balance (December 31) $ 19.8us-gaap_UnrecognizedTaxBenefits $ 19.1us-gaap_UnrecognizedTaxBenefits