Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS (Changes in Amount of Goodwill) (Detail)

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GOODWILL AND INTANGIBLE ASSETS (Changes in Amount of Goodwill) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Goodwill [Line Items]  
Balance, December 31, 2013 $ 2,395.1
Acquisitions 240.2
Adjustments to initial purchase price allocation (0.2)
Foreign currency translation (0.4)
Tax benefits of stock options exercised (0.1)
Balance, March 31, 2014 2,634.6
U.S. Consumer Information Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2013 1,032.5
Acquisitions 0
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised 0
Balance, March 31, 2014 1,032.5
International [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2013 401.0
Acquisitions 230.7
Adjustments to initial purchase price allocation (0.2)
Foreign currency translation (0.2)
Tax benefits of stock options exercised 0
Balance, March 31, 2014 631.3
Workforce Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2013 907.7
Acquisitions 0
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised (0.1)
Balance, March 31, 2014 907.6
North America Personal Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2013 16.7
Acquisitions 0
Adjustments to initial purchase price allocation 0
Foreign currency translation 0
Tax benefits of stock options exercised 0
Balance, March 31, 2014 16.7
North America Commercial Solutions [Member]
  
Goodwill [Line Items]  
Balance, December 31, 2013 37.2
Acquisitions 9.5
Adjustments to initial purchase price allocation 0
Foreign currency translation (0.2)
Tax benefits of stock options exercised 0
Balance, March 31, 2014 $ 46.5