Annual report pursuant to Section 13 and 15(d)

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

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GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Beginning Balance $ 4,129.7 $ 4,184.0
Acquisitions 195.9 89.3
Adjustments to initial purchase price allocation 1.3 1.2
Foreign currency translation (18.6) (144.8)
Ending Balance 4,308.3 4,129.7
U.S. Information Solutions    
Goodwill [Roll Forward]    
Beginning Balance 1,128.9 1,071.3
Acquisitions 153.7 57.7
Adjustments to initial purchase price allocation (1.9) (0.1)
Foreign currency translation 0.0 0.0
Ending Balance 1,280.7 1,128.9
Workforce Solutions    
Goodwill [Roll Forward]    
Beginning Balance 970.2 952.1
Acquisitions 40.1 17.1
Adjustments to initial purchase price allocation 0.1 1.0
Foreign currency translation 0.0 0.0
Ending Balance 1,010.4 970.2
International    
Goodwill [Roll Forward]    
Beginning Balance 1,844.7 1,969.4
Acquisitions 2.1 14.5
Adjustments to initial purchase price allocation 3.1 1.3
Foreign currency translation (20.7) (140.5)
Ending Balance 1,829.2 1,844.7
Global Consumer Solutions    
Goodwill [Roll Forward]    
Beginning Balance 185.9 191.2
Acquisitions 0.0 0.0
Adjustments to initial purchase price allocation 0.0 (1.0)
Foreign currency translation 2.1 (4.3)
Ending Balance $ 188.0 $ 185.9