v3.26.1
Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Net Income per Share [Abstract]        
Net Income - Omnicom Group Inc. $ 584.8 $ 257.6 $ 990.0 $ 545.3
Weighted Average Shares (millions):        
Basic 279.9 194.9 289.0 195.8
Dilutive stock options and restricted shares 1.1 1.1 1.2 1.3
Diluted 281.0 196.0 290.2 197.1
Anti-dilutive stock options and restricted shares (millions) 6.2 6.5 6.2 5.8
Net Income per Share - Omnicom Group Inc.:        
Basic $ 2.09 $ 1.32 $ 3.43 $ 2.78
Diluted $ 2.08 $ 1.31 $ 3.41 $ 2.77