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Net Income per Share
9 Months Ended
Sep. 30, 2020
Net Income per Share [Abstract]  
Net Income per Share Net Income per Share
The computations of basic and diluted net income per share were (in millions, except per share amounts):
Three Months Ended September 30,
Nine Months Ended September 30,
2020201920202019
Net Income - Omnicom Group Inc.$313.3 $290.2 $547.3 $924.1 
Weighted Average Shares:   
Basic215.4 218.2 215.6 220.3 
Dilutive stock options and restricted shares0.4 1.2 0.6 1.2 
Diluted215.8 219.4 216.2 221.5 
Anti-dilutive stock options and restricted shares0.8 0.9 0.8 0.9 
Net Income per Share - Omnicom Group Inc.:   
Basic$1.45 $1.33 $2.54 $4.19 
Diluted$1.45 $1.32 $2.53 $4.17