Annual report pursuant to Section 13 and 15(d)

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

v3.24.0.1
GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]    
Beginning Balance $ 6,383.9 $ 6,258.1
Acquisitions 410.4 283.8
Adjustments to initial purchase price allocation 2.8 0.1
Foreign currency translation 32.8 (133.5)
Divestitures   (24.6)
Ending Balance 6,829.9 6,383.9
Workforce Solutions    
Goodwill [Roll Forward]    
Beginning Balance 2,520.8 2,365.4
Acquisitions 0.0 145.0
Adjustments to initial purchase price allocation (0.7) 10.7
Foreign currency translation 0.1 (0.3)
Divestitures   0.0
Ending Balance 2,520.2 2,520.8
U.S. Information Solutions    
Goodwill [Roll Forward]    
Beginning Balance 2,004.8 1,900.1
Acquisitions 0.0 111.8
Adjustments to initial purchase price allocation 1.4 (7.1)
Foreign currency translation 0.0 0.0
Divestitures   0.0
Ending Balance 2,006.2 2,004.8
International    
Goodwill [Roll Forward]    
Beginning Balance 1,858.3 1,992.6
Acquisitions 410.4 27.0
Adjustments to initial purchase price allocation 2.1 (3.5)
Foreign currency translation 32.7 (133.2)
Divestitures   (24.6)
Ending Balance $ 2,303.5 $ 1,858.3