v3.26.1
Goodwill and Other Intangible Assets - Changes in Carrying Value of Goodwill by Reportable Segment (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Goodwill [Roll Forward]    
Goodwill [1] $ 1,539.4 $ 1,544.6
Jefferson Wells    
Goodwill [Roll Forward]    
Goodwill (55.5) (55.5)
Right Management    
Goodwill [Roll Forward]    
Goodwill (62.1) (62.1)
Americas | United States    
Goodwill [Roll Forward]    
Goodwill 1,007.2 1,007.2
Southern Europe | France    
Goodwill [Roll Forward]    
Goodwill 79.2 80.5
Southern Europe | Italy    
Goodwill [Roll Forward]    
Goodwill $ 4.0 $ 4.0
[1] Balances were net of accumulated impairment loss of $807.4 as of both March 31, 2026 and December 31, 2025.