Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2020

Net Income per Share [Abstract]

Computations of Basic and Diluted Net Income per Share

The computations of basic and diluted net income per share were (in millions, except per share amounts):

	Year Ended December 31,
	2020		2019		2018
Net income available for common shares:
Net income - Omnicom Group Inc.	$	945.4	$	1,339.1	$	1,326.4
Weighted average shares:
Basic	215.6		219.8		226.6
Dilutive stock options and restricted shares	0.6		1.1		1.0
Diluted	216.2		220.9		227.6
Anti-dilutive stock options and restricted shares	0.8		—		1.0
Net income per share - Omnicom Group Inc.:
Basic	$	4.38	$	6.09	$	5.85
Diluted	$	4.37	$	6.06	$	5.83