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Net Income per Common Share (Tables)
 12 Months Ended
Dec. 31, 2011
Net Income per Common Share [Abstract]  
Computations of Basic and Diluted Net Income per Common Share - Omnicom Group Inc. [Table Text Block]
The computations of basic and diluted net income per common share - Omnicom Group Inc. for the three years ended December 31, 2011 were (in millions, except per share amounts):
 
 
 
 
 
 
 
2011
 
2010
 
2009
 
 
 
 
 
 
Net Income Available for Common Shares:
 
 
 
 
 
Net income - Omnicom Group Inc.
$
952.6

 
$
827.7

 
$
793.0

Net income allocated to participating securities
(10.7
)
 
(8.0
)
 
(9.1
)
 
 
 
 
 
 
Net income available for common shares
$
941.9

 
$
819.7

 
$
783.9

 
 
 
 
 
 
 
 
 
 
 
 
Weighted Average Shares:
 
 
 
 
 
Basic
279.0

 
299.6

 
308.2

Dilutive stock options and restricted shares
4.3

 
3.9

 
2.2

 
 
 
 
 
 
Diluted
283.3

 
303.5

 
310.4

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Anti-dilutive stock options and restricted shares
1.7

 
3.0

 
10.9

 
 
 
 
 
 
 
 
 
 
 
 
Net Income per Common Share - Omnicom Group Inc.:
 
 
 
 
 
Basic
$
3.38

 
$
2.74

 
$
2.54

Diluted
$
3.33

 
$
2.70

 
$
2.53