Quarterly report pursuant to Section 13 or 15(d)

Changes in Amount of Goodwill (Detail)

v2.4.0.8
Changes in Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Goodwill [Line Items]  
Balance, December 31, 2012 $ 2,290.4
Acquisitions 14.5
Adjustments to initial purchase price allocation 87.5
Foreign currency translation (6.0)
Tax benefits of stock options exercised (0.2)
Businesses sold (30.2)
Balance, September 30, 2013 2,356.0
U.S. Consumer Information Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2012 947.7
Acquisitions 0
Adjustments to initial purchase price allocation 87.5
Foreign currency translation 0
Tax benefits of stock options exercised 0
Businesses sold (2.7)
Balance, September 30, 2013 1,032.5
International [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2012 369.3
Acquisitions 0
Adjustments to initial purchase price allocation 0
Foreign currency translation (5.8)
Tax benefits of stock options exercised 0
Businesses sold (1.4)
Balance, September 30, 2013 362.1
Workforce Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2012 934.0
Acquisitions 0
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised (0.2)
Businesses sold (26.1)
Balance, September 30, 2013 907.7
North America Personal Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2012 1.8
Acquisitions 14.5
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised 0
Businesses sold 0
Balance, September 30, 2013 16.3
North America Commercial Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2012 37.6
Acquisitions 0
Adjustments to initial purchase price allocation 0
Foreign currency translation (0.2)
Tax benefits of stock options exercised 0
Businesses sold 0
Balance, September 30, 2013 $ 37.4