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ACCUMULATED OTHER COMPREHENSIVE INCOME (Changes In Accumulated Other Comprehensive Income) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, December 31, 2013 $ (312.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (362.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income before reclassifications (131.0)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax  
Amounts reclassified from accumulated other comprehensive income 8.2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax  
Net current-period other comprehensive income (122.8)efx_Currentsperiodothercomprehensiveincomelossnetoftax  
Balance, December 31, 2014 (435.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (362.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Cash flow hedging transactions    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, December 31, 2013 (1.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
 
Other comprehensive income before reclassifications 0.1us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
 
Amounts reclassified from accumulated other comprehensive income 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
 
Net current-period other comprehensive income 0.1efx_Currentsperiodothercomprehensiveincomelossnetoftax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
 
Balance, December 31, 2014 (1.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
 
Pension and other postretirement benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, December 31, 2013 (202.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Other comprehensive income before reclassifications (69.3)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Amounts reclassified from accumulated other comprehensive income 8.2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Net current-period other comprehensive income (61.1)efx_Currentsperiodothercomprehensiveincomelossnetoftax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Balance, December 31, 2014 (263.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Foreign currency    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance, December 31, 2013 (108.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember
 
Other comprehensive income before reclassifications (61.8)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember
 
Amounts reclassified from accumulated other comprehensive income 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember
 
Net current-period other comprehensive income (61.8)efx_Currentsperiodothercomprehensiveincomelossnetoftax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember
 
Balance, December 31, 2014 $ (170.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember