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Net Income per Share
 9 Months Ended
Sep. 30, 2018
Net Income per Share [Abstract]  
Net Income per Share
Net Income per Share
The computations of basic and diluted net income per share for the three and nine months ended September 30, 2018 and 2017 were (in millions, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Net Income Available for Common Shares:
 
 
 
 
 
 
 
Net income - Omnicom Group Inc.
$
298.9

 
$
263.6

 
$
927.2

 
$
834.0

Net income allocated to participating securities
—

 
(0.3
)
 
(0.1
)
 
(1.4
)
 
$
298.9

 
$
263.3

 
$
927.1

 
$
832.6

Weighted Average Shares:
 
 
 
 
 
 
 
Basic
224.8

 
231.2

 
227.2

 
232.6

Dilutive stock options and restricted shares
1.1

 
1.5

 
1.3

 
1.8

Diluted
225.9

 
232.7

 
228.5

 
234.4

 
 
 
 
 
 
 
 
Anti-dilutive stock options and restricted shares
1.0

 
1.0

 
1.0

 
1.0

Net Income per Share - Omnicom Group Inc.:
 
 
 
 
 
 
 
Basic
$
1.33

 
$
1.14

 
$
4.08

 
$
3.58

Diluted
$
1.32

 
$
1.13

 
$
4.06

 
$
3.55