Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.4
GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Amount of Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Beginning Balance $ 6,547.8 $ 6,829.9
Adjustments to initial purchase price allocation   (68.7)
Acquisitions 54.1  
Foreign currency translation 143.8 (213.4)
Ending Balance 6,745.7 6,547.8
Workforce Solutions    
Goodwill [Roll Forward]    
Beginning Balance 2,519.8 2,520.2
Adjustments to initial purchase price allocation   0.0
Acquisitions 54.1  
Foreign currency translation 0.2 (0.4)
Ending Balance 2,574.1 2,519.8
U.S. Information Solutions    
Goodwill [Roll Forward]    
Beginning Balance 2,006.2 2,006.2
Adjustments to initial purchase price allocation   0.0
Acquisitions 0.0  
Foreign currency translation 0.0 0.0
Ending Balance 2,006.2 2,006.2
International    
Goodwill [Roll Forward]    
Beginning Balance 2,021.8 2,303.5
Adjustments to initial purchase price allocation   (68.7)
Acquisitions 0.0  
Foreign currency translation 143.6 (213.0)
Ending Balance $ 2,165.4 $ 2,021.8