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, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Beginning Balance $ 4,495.8 $ 4,308.3
Acquisitions 1,842.0 58.3
Adjustments to initial purchase price allocation 0.7 0.3
Foreign currency translation (79.1) 128.9
Divestitures (1.3)  
Ending Balance 6,258.1 4,495.8
Workforce Solutions    
Goodwill [Roll Forward]    
Beginning Balance 1,023.3 1,023.0
Acquisitions 1,342.1 0.0
Adjustments to initial purchase price allocation 0.0 0.3
Foreign currency translation 0.0 0.0
Divestitures 0.0  
Ending Balance 2,365.4 1,023.3
U.S. Information Solutions    
Goodwill [Roll Forward]    
Beginning Balance 1,417.9 1,411.9
Acquisitions 481.5 6.0
Adjustments to initial purchase price allocation 0.7 0.0
Foreign currency translation 0.0 0.0
Divestitures 0.0  
Ending Balance 1,900.1 1,417.9
International    
Goodwill [Roll Forward]    
Beginning Balance 2,054.6 1,873.4
Acquisitions 18.4 52.3
Adjustments to initial purchase price allocation 0.0 0.0
Foreign currency translation (79.1) 128.9
Divestitures (1.3)  
Ending Balance $ 1,992.6 $ 2,054.6