Quarterly Results of Operations (Unaudited)

12 Months Ended

Dec. 31, 2011

Quarterly Results of Operations (Unaudited) [Abstract]

Quarterly Results of Operations (Unaudited) [Text Block]

Quarterly Results of Operations (Unaudited)

The Company’s unaudited quarterly results of operations for the years ended December 31, 2011 and 2010 were (in millions, except for per share amounts):

	Quarter
	First		Second		Third		Fourth
Revenue
2011	$	3,151.3	$	3,487.4	$	3,380.9	$	3,852.9
2010	2,920.0		3,041.2		2,994.6		3,586.7
Operating Expenses
2011	2,829.2		2,999.3		3,007.5		3,365.5
2010	2,629.0		2,625.8		2,680.5		3,147.0
Operating Income
2011	322.1		488.1		373.4		487.4
2010	291.0		415.4		314.1		439.7
Net Income - Omnicom Group Inc.
2011	201.9		275.1		203.7		271.9
2010	163.4		243.3		174.6		246.4
Net Income Per Share Omnicom Group Inc. - Basic
2011	0.70		0.98		0.73		0.97
2010	0.53		0.80		0.58		0.84
Net Income Per Share Omnicom Group Inc. - Diluted
2011	0.69		0.96		0.72		0.96
2010	0.52		0.79		0.57		0.83