Quarterly report pursuant to Section 13 or 15(d)

Changes in Amount of Goodwill (Detail)

v2.4.0.6
Changes in Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Goodwill [Line Items]  
Balance, December 31, 2012 $ 2,290.4
Adjustments to initial purchase price allocation (1.0)
Foreign currency translation (7.0)
Tax benefits of stock options exercised (0.1)
Businesses sold (28.8)
Balance, March 31, 2013 2,253.5
U.S. Consumer Information Solutions [Member]
 
Goodwill [Line Items]  
Balance, December 31, 2012 947.7
Adjustments to initial purchase price allocation (1.0)
Foreign currency translation 0
Tax benefits of stock options exercised 0
Businesses sold (2.7)
Balance, March 31, 2013 944.0
International [Member]
 
Goodwill [Line Items]  
Balance, December 31, 2012 369.3
Adjustments to initial purchase price allocation 0
Foreign currency translation (6.8)
Tax benefits of stock options exercised 0
Businesses sold 0
Balance, March 31, 2013 362.5
Workforce Solutions [Member]
 
Goodwill [Line Items]  
Balance, December 31, 2012 934.0
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised (0.1)
Businesses sold (26.1)
Balance, March 31, 2013 907.8
North America Personal Solutions [Member]
 
Goodwill [Line Items]  
Balance, December 31, 2012 1.8
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised 0
Businesses sold 0
Balance, March 31, 2013 1.8
North America Commercial Solutions [Member]
 
Goodwill [Line Items]  
Balance, December 31, 2012 37.6
Adjustments to initial purchase price allocation 0
Foreign currency translation (0.2)
Tax benefits of stock options exercised 0
Businesses sold 0
Balance, March 31, 2013 $ 37.4