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Net Income per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Net Income per Share [Abstract]  
Computations of Basic and Diluted Net Income per Share
The computations of basic and diluted net income per share for the three years ended December 31, 2017 were (in millions, except per share amounts):
 
2017
 
2016
 
2015
Net Income Available for Common Shares:
 
 
 
 
 
Net income - Omnicom Group Inc.
$
1,088.4

 
$
1,148.6

 
$
1,093.9

Net income allocated to participating securities
(1.6
)
 
(6.5
)
 
(12.4
)
 
$
1,086.8

 
$
1,142.1

 
$
1,081.5

Weighted Average Shares:
 
 
 
 
 
Basic
232.3

 
237.9

 
244.2

Dilutive stock options and restricted shares
1.6

 
1.3

 
1.0

Diluted
233.9

 
239.2

 
245.2

 
 
 
 
 
 
Anti-dilutive stock options and restricted shares
1.0

 
—

 
0.1

Net Income per Share - Omnicom Group Inc.:
 
 
 
 
 
Basic
$
4.68

 
$
4.80

 
$
4.43

Diluted
$
4.65

 
$
4.78

 
$
4.41