v3.22.4
Net Income per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net Income per Share [Abstract]      
Net income - Omnicom Group Inc. $ 1,316.5 $ 1,407.8 $ 945.4
Weighted average shares:      
Basic 205.6 214.3 215.6
Dilutive stock options and restricted shares 1.4 1.3 0.6
Diluted 207.0 215.6 216.2
Anti-dilutive stock options and restricted shares 4.3 4.7 0.8
Net income per share - Omnicom Group Inc.:      
Basic $ 6.40 $ 6.57 $ 4.38
Diluted $ 6.36 $ 6.53 $ 4.37