Annual report pursuant to Section 13 and 15(d)

SEGMENT INFORMATION (Financial Information by Geographic Area) (Detail)

v2.4.1.9
SEGMENT INFORMATION (Financial Information by Geographic Area) (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
Revenues from External Customers and Long-Lived Assets [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
Percentage of operating revenues                 100.00%efx_PercentageOfConsolidatedOperatingRevenues 100.00%efx_PercentageOfConsolidatedOperatingRevenues 100.00%efx_PercentageOfConsolidatedOperatingRevenues
Long-lived assets 4,069.1us-gaap_NoncurrentAssets       3,891.5us-gaap_NoncurrentAssets       4,069.1us-gaap_NoncurrentAssets 3,891.5us-gaap_NoncurrentAssets  
Percentage of consolidated long-lived assets                 100.00%efx_PercentageOfLongLivedAssets 100.00%efx_PercentageOfLongLivedAssets  
U.S.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenue                 1,810.2us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_US
1,766.0us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_US
1,561.9us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_US
Percentage of operating revenues                 74.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= country_US
77.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= country_US
76.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= country_US
Long-lived assets 3,286.1us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
      3,332.8us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
      3,286.1us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
3,332.8us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
 
Percentage of consolidated long-lived assets                 81.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_US
86.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_US
 
Canada                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenue                 154.2us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= stpr_CA
155.6us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= stpr_CA
153.9us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Percentage of operating revenues                 6.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= stpr_CA
7.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= stpr_CA
7.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Long-lived assets 55.8us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
      54.7us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
      55.8us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
54.7us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
 
Percentage of consolidated long-lived assets                 1.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
1.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= stpr_CA
 
U.K.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenue                 217.0us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_GB
144.7us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_GB
133.5us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= country_GB
Percentage of operating revenues                 9.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= country_GB
6.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= country_GB
6.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= country_GB
Long-lived assets 371.9us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_GB
      122.3us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_GB
      371.9us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_GB
122.3us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_GB
 
Percentage of consolidated long-lived assets                 9.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_GB
3.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= country_GB
 
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Operating revenue                 255.0us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
237.6us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
223.7us-gaap_SalesRevenueServicesNet
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
Percentage of operating revenues                 11.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
10.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
11.00%efx_PercentageOfConsolidatedOperatingRevenues
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
Long-lived assets $ 355.3us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
      $ 381.7us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
      $ 355.3us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
$ 381.7us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
 
Percentage of consolidated long-lived assets                 9.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember
10.00%efx_PercentageOfLongLivedAssets
/ us-gaap_StatementGeographicalAxis
= efx_OtherCountriesMember