Annual report pursuant to Section 13 and 15(d)

INCOME TAXES (Provision for Income Taxes Reconciles with U.S. Federal Statutory Rate) (Detail)

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INCOME TAXES (Provision for Income Taxes Reconciles with U.S. Federal Statutory Rate) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]        
Federal statutory rate   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Provision computed at federal statutory rate   $ 201.0us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 185.6us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 151.0us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local taxes, net of federal tax benefit   13.1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 12.1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 5.8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign   (7.3)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (4.1)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (5.3)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Valuation allowance   (2.2)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.6)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.9)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax reserves   0.6us-gaap_IncomeTaxReconciliationTaxContingencies (1.2)us-gaap_IncomeTaxReconciliationTaxContingencies 0.2us-gaap_IncomeTaxReconciliationTaxContingencies
Currency and other tax effects of Brazil Transaction 15.3efx_IncomeTaxReconciliationAcquisitionRelatedTransactionCosts 0efx_IncomeTaxReconciliationAcquisitionRelatedTransactionCosts 0efx_IncomeTaxReconciliationAcquisitionRelatedTransactionCosts (15.3)efx_IncomeTaxReconciliationAcquisitionRelatedTransactionCosts
Global restructuring 20.5efx_IncomeTaxReconciliationChangeInTaxRate 0efx_IncomeTaxReconciliationChangeInTaxRate 0efx_IncomeTaxReconciliationChangeInTaxRate 20.5efx_IncomeTaxReconciliationChangeInTaxRate
Other   (5.0)us-gaap_IncomeTaxReconciliationOtherAdjustments (2.9)us-gaap_IncomeTaxReconciliationOtherAdjustments 0us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision for income taxes   $ 200.2us-gaap_IncomeTaxExpenseBenefit $ 188.9us-gaap_IncomeTaxExpenseBenefit $ 156.0us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate   34.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations