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Net Income per Share
 9 Months Ended
Sep. 30, 2025
Net Income per Share [Abstract]  
Net Income per Share Net Income per Share
Basic and diluted net income per share:
Three Months Ended September 30,
Nine Months Ended September 30,
2025202420252024
Net Income - Omnicom Group Inc.$341.3 $385.9 $886.6 $1,032.6 
Weighted Average Shares (millions):   
Basic193.8 195.6 195.2 196.5 
Dilutive stock options and restricted shares1.1 2.6 1.2 2.4 
Diluted194.9 198.2 196.4 198.9 
Anti-dilutive stock options and restricted shares (millions)5.8 — 5.8 — 
Net Income per Share - Omnicom Group Inc.:   
Basic$1.76$1.97$4.54$5.25
Diluted$1.75$1.95$4.51$5.19
Potentially dilutive common shares are due to our share-based employee compensation plans and agreements, which primarily relate to stock options granted in the second quarter of 2025. The number of potential common shares excluded from diluted shares outstanding was 5.8 million for both the three and nine months ended September 30, 2025, because the effect of including those common shares in the calculation would have been anti-dilutive. There were no potentially dilutive common shares excluded from diluted shares outstanding for the three and nine months ended September 30, 2024.