Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS - Changes in Amount of Goodwill (Details)

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GOODWILL AND INTANGIBLE ASSETS - Changes in Amount of Goodwill (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Balance, Beginning of period $ 4,184.0
Acquisitions 19.1
Adjustments to initial purchase price allocation 0.5
Foreign currency translation (67.7)
Balance, End of period 4,135.9
U.S. Information Solutions  
Goodwill [Roll Forward]  
Balance, Beginning of period 1,071.3
Acquisitions 0.0
Adjustments to initial purchase price allocation 0.0
Foreign currency translation 0.0
Balance, End of period 1,071.3
International  
Goodwill [Roll Forward]  
Balance, Beginning of period 1,969.4
Acquisitions 2.0
Adjustments to initial purchase price allocation 1.0
Foreign currency translation (66.7)
Balance, End of period 1,905.7
Workforce Solutions  
Goodwill [Roll Forward]  
Balance, Beginning of period 952.1
Acquisitions 17.1
Adjustments to initial purchase price allocation 0.5
Foreign currency translation 0.0
Balance, End of period 969.7
Global Consumer Solutions  
Goodwill [Roll Forward]  
Balance, Beginning of period 191.2
Acquisitions 0.0
Adjustments to initial purchase price allocation (1.0)
Foreign currency translation (1.0)
Balance, End of period $ 189.2