Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION (Segment Information) (Detail)

v2.4.1.9
SEGMENT INFORMATION (Segment Information) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Disclosure [Line Items]                      
Operating revenue $ 624.6us-gaap_SalesRevenueServicesNet $ 613.4us-gaap_SalesRevenueServicesNet $ 613.9us-gaap_SalesRevenueServicesNet $ 584.5us-gaap_SalesRevenueServicesNet $ 578.5us-gaap_SalesRevenueServicesNet $ 572.0us-gaap_SalesRevenueServicesNet $ 586.9us-gaap_SalesRevenueServicesNet $ 566.5us-gaap_SalesRevenueServicesNet $ 2,436.4us-gaap_SalesRevenueServicesNet $ 2,303.9us-gaap_SalesRevenueServicesNet $ 2,073.0us-gaap_SalesRevenueServicesNet
Operating income 165.2us-gaap_OperatingIncomeLoss 153.7us-gaap_OperatingIncomeLoss 167.4us-gaap_OperatingIncomeLoss 151.9us-gaap_OperatingIncomeLoss 154.1us-gaap_OperatingIncomeLoss 150.0us-gaap_OperatingIncomeLoss 158.1us-gaap_OperatingIncomeLoss 149.0us-gaap_OperatingIncomeLoss 638.2us-gaap_OperatingIncomeLoss 611.2us-gaap_OperatingIncomeLoss 480.0us-gaap_OperatingIncomeLoss
Total Assets 4,674.2us-gaap_Assets       4,539.9us-gaap_Assets       4,674.2us-gaap_Assets 4,539.9us-gaap_Assets  
Depreciation and amortization                 201.8us-gaap_DepreciationAndAmortization 189.6us-gaap_DepreciationAndAmortization 160.0us-gaap_DepreciationAndAmortization
Capital expenditures                 86.4us-gaap_PaymentsToAcquireProductiveAssets 83.3us-gaap_PaymentsToAcquireProductiveAssets 66.0us-gaap_PaymentsToAcquireProductiveAssets
U.S. Information Solutions                      
Segment Reporting Disclosure [Line Items]                      
Operating revenue                 1,104.8us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
1,084.5us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
934.4us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Operating income                 428.2us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
410.0us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
356.0us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Total Assets 1,983.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
      1,979.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
      1,983.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
1,979.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
 
Depreciation and amortization                 86.7us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
88.8us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
44.2us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
Capital expenditures                 16.6us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
16.7us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
18.2us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_USConsumerInformationSolutionsMember
International                      
Segment Reporting Disclosure [Line Items]                      
Operating revenue                 626.2us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
537.9us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
511.0us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Operating income                 140.4us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
157.3us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
152.8us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Total Assets 1,059.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
      738.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
      1,059.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
738.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
 
Depreciation and amortization                 44.4us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
24.1us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
25.9us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Capital expenditures                 15.2us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
19.7us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
10.8us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_InternationalMember
Workforce Solutions                      
Segment Reporting Disclosure [Line Items]                      
Operating revenue                 490.1us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
474.1us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
442.1us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
Operating income                 160.7us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
142.6us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
106.6us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
Total Assets 1,271.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
      1,295.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
      1,271.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
1,295.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
 
Depreciation and amortization                 42.6us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
51.7us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
66.2us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
Capital expenditures                 13.1us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
14.6us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
12.8us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_WorkforceMember
North America Personal Solutions                      
Segment Reporting Disclosure [Line Items]                      
Operating revenue                 215.3us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
207.4us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
185.5us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Operating income                 66.8us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
58.6us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
50.4us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Total Assets 47.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
      42.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
      47.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
42.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
 
Depreciation and amortization                 8.0us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
7.5us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
7.0us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
Capital expenditures                 9.2us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
6.9us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
6.1us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= efx_NorthAmericaPersonalSolutionsMember
General Corporate Expense                      
Segment Reporting Disclosure [Line Items]                      
Operating income                 (157.9)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
(157.3)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
(185.8)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Total Assets 311.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
      484.1us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
      311.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
484.1us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
 
Depreciation and amortization                 20.1us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
17.5us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
16.7us-gaap_DepreciationAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
Capital expenditures                 $ 32.3us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 25.4us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember
$ 18.1us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember