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DEBT - Additional Information (Details) - USD ($) |  | 9 Months Ended
--- | --- | ---
May 16, 2016 | Sep. 30, 2016
Debt Instrument [Line Items] |  |
Credit facility borrowing capacity |  | $ 900,000,000.0
Line of credit facility, potential maximum borrowing capacity |  | 1,200,000,000.0
Line of credit facility, available for borrowing |  | 467,800,000
Bridge loan availability |  | 800,000,000.0
Commercial paper notes |  | 900,000,000.0
Commercial paper, notes outstanding |  | $ 431,700,000
Commercial paper, maturity date (less than) |  | 90 days
Maximum |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 1 year
Commercial paper, maturity period range |  | 397 days
364-Day Revolver |  |
Debt Instrument [Line Items] |  |
Debt extinguished | $ 475,000,000 |
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt instrument, term |  | 5 years
Line of credit facility, expiration date |  | Nov. 30, 2020
Long-term line of credit |  | $ 0
Term Loan |  |
Debt Instrument [Line Items] |  |
Availability under the delayed draw term loan |  | $ 800,000,000.0
Line of credit facility, expiration date |  | Nov. 30, 2018
Letter of Credit |  |
Debt Instrument [Line Items] |  |
Letters of credit outstanding, amount |  | $ 500,000

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- Definition Availability Under the Delayed Draw Term Loan + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Bridge Loan Availability + References No definition available. + Details
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Namespace Prefix: | efx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Commercial Paper Maturity Period + References No definition available. + Details
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- Definition Commercial Paper Maturity Period Range + References No definition available. + Details
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- Definition Commercial Paper, Maximum Borrowing Capacity + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line of Credit Facility, Potential Maximum Borrowing Capacity + References No definition available. + Details
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Namespace Prefix: | efx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Gross amount of debt extinguished. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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