Annual report pursuant to Section 13 and 15(d)

Changes in Amount of Goodwill (Detail)

v2.4.0.6
Changes in Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
US Consumer Information Solutions
Dec. 31, 2011
US Consumer Information Solutions
Dec. 31, 2012
International
Dec. 31, 2011
International
Dec. 31, 2012
Workforce Solutions
Dec. 31, 2011
Workforce Solutions
Dec. 31, 2012
North America Personal Solutions
Dec. 31, 2011
North America Personal Solutions
Dec. 31, 2010
North America Personal Solutions
Dec. 31, 2012
North America Commercial Solutions
Dec. 31, 2011
North America Commercial Solutions
Goodwill [Line Items]                          
Beginning Balance $ 1,961.2 $ 1,914.7 $ 638.4 $ 628.5 $ 348.5 $ 346.9 $ 935.0 $ 899.9 $ 1.8 $ 1.8 $ 1.8 $ 37.5 $ 37.6
Acquisitions 321.3 75.6 309.3 10.1 12.0 30.9   34.6          
Adjustments to initial purchase price allocation (1.0) 0.2   (0.2)   (0.1) (1.0) 0.5          
Foreign currency translation 8.9 3.9     8.8 4.0           0.1 (0.1)
Businesses sold   (33.2)       (33.2)              
Ending Balance $ 2,290.4 $ 1,961.2 $ 947.7 $ 638.4 $ 369.3 $ 348.5 $ 934.0 $ 935.0 $ 1.8 $ 1.8 $ 1.8 $ 37.6 $ 37.5