Annual report pursuant to Section 13 and 15(d)

DEBT (Debt Outstanding) (Detail)

v2.4.1.9
DEBT (Debt Outstanding) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Total debt $ 1,527.9us-gaap_LongTermDebt $ 1,438.1us-gaap_LongTermDebt
Short-term debt and current maturities (380.4)us-gaap_DebtCurrent (296.5)us-gaap_DebtCurrent
Less unamortized discounts (1.8)us-gaap_DebtInstrumentUnamortizedDiscount (2.1)us-gaap_DebtInstrumentUnamortizedDiscount
Plus fair value adjustments 0efx_FairValueAdjustmentOfDebt 6.0efx_FairValueAdjustmentOfDebt
Total long-term debt, net of discount 1,145.7us-gaap_LongTermDebtNoncurrent 1,145.5us-gaap_LongTermDebtNoncurrent
Commercial paper (CP)    
Debt Instrument [Line Items]    
Total debt 379.7us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
Notes, 7.34%, due in installments through May 2014    
Debt Instrument [Line Items]    
Total debt 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointThreeFourPercentDueInInstallmentsThroughMayTwentyFourteenMember
15.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointThreeFourPercentDueInInstallmentsThroughMayTwentyFourteenMember
Debt, interest rate 7.34%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointThreeFourPercentDueInInstallmentsThroughMayTwentyFourteenMember
7.34%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointThreeFourPercentDueInInstallmentsThroughMayTwentyFourteenMember
Debt, maturity date 2014-05 2014-05
Notes, 4.45%, due December 2014    
Debt Instrument [Line Items]    
Total debt 0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesFourPointFourFivePercentDueDecemberTwentyFourteenMember
275.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesFourPointFourFivePercentDueDecemberTwentyFourteenMember
Debt, interest rate 4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesFourPointFourFivePercentDueDecemberTwentyFourteenMember
4.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesFourPointFourFivePercentDueDecemberTwentyFourteenMember
Debt, maturity date 2014-12 2014-12
Notes, 6.30%, due July 2017    
Debt Instrument [Line Items]    
Total debt 272.5us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
272.5us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
Debt, interest rate 6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
Debt, maturity date 2017-07 2017-07
Notes, 3.30%, due Dec 2022    
Debt Instrument [Line Items]    
Total debt 500.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
500.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
Debt, interest rate 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
Debt, maturity date 2022-12 2022-12
Debentures, 6.90%, due July 2028    
Debt Instrument [Line Items]    
Total debt 125.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwoEightMember
125.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwoEightMember
Debt, interest rate 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwoEightMember
6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwoEightMember
Debt, maturity date 2028-07 2028-07
Notes, 7.00%, due July 2037    
Debt Instrument [Line Items]    
Total debt 250.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroZeroPercentDueJulyTwentyThirtySevenMember
250.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroZeroPercentDueJulyTwentyThirtySevenMember
Debt, interest rate 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroZeroPercentDueJulyTwentyThirtySevenMember
7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroZeroPercentDueJulyTwentyThirtySevenMember
Debt, maturity date 2037-07 2037-07
Other    
Debt Instrument [Line Items]    
Total debt $ 0.7us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebtOtherMember
$ 0.6us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebtOtherMember