Net Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Net Income Per Common Share [Abstract]

Computations of Basic and Diluted Net Income Per Common Share - Omnicom Group Inc. [Table Text Block]

	Three Months Ended June 30						Six Months Ended June 30
		2011		2010				2011			2010
Net Income Available for Common Shares:
Net income - Omnicom Group Inc	$	275.1		$	243.3		$	477.0		$	406.7
Net income allocated to participating securities		(2.9	)		(2.2	)		(4.9	)		(4.0	)
Net Income available for common shares	$	272.2		$	241.1		$	472.1		$	402.7
Weighted Average Shares:
Basic		278.7			302.3			281.2			304.3
Dilutive stock options and restricted shares		5.0			4.7			4.9			4.4
Diluted		283.7			307.0			286.1			308.7
Anti-dilutive stock options and restricted shares		0.3			11.5			0.3			11.5
Net Income per Common Share - Omnicom Group Inc.:
Basic	$	0.98		$	0.80		$	1.68		$	1.32
Diluted		0.96			0.79			1.65			1.30