Quarterly report pursuant to Section 13 or 15(d)

DEBT (Debt Outstanding) (Detail)

v2.4.1.9
DEBT (Debt Outstanding) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Outstanding [Line Items]    
Total debt $ 1,525.0us-gaap_LongTermDebt $ 1,527.9us-gaap_LongTermDebt
Short-term debt and current maturities (377.5)us-gaap_DebtCurrent (380.4)us-gaap_DebtCurrent
Unamortized discounts (1.7)us-gaap_DebtInstrumentUnamortizedDiscount (1.8)us-gaap_DebtInstrumentUnamortizedDiscount
Total long-term debt, net 1,145.8us-gaap_LongTermDebtNoncurrent 1,145.7us-gaap_LongTermDebtNoncurrent
Commercial paper    
Debt Outstanding [Line Items]    
Total debt 375.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
379.7us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_CommercialPaperMember
Notes, 6.30%, due July 2017    
Debt Outstanding [Line Items]    
Total debt 272.5us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
272.5us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
Notes, 3.30%, due Dec 2022    
Debt Outstanding [Line Items]    
Total debt 500.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
500.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
Debentures, 6.90%, due July 2028    
Debt Outstanding [Line Items]    
Total debt 125.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwentyEightMember
125.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwentyEightMember
Notes, 7.00%, due July 2037    
Debt Outstanding [Line Items]    
Total debt 250.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroPercentDueJulyTwentyThirtySevenMember
250.0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroPercentDueJulyTwentyThirtySevenMember
Other    
Debt Outstanding [Line Items]    
Total debt $ 2.5us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebtOtherMember
$ 0.7us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= efx_DebtOtherMember