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Net Income Per Common Share
 6 Months Ended
Jun. 30, 2013
Net Income per Common Share [Abstract]  
Net Income per Common Share
Net Income per Common Share
Net income per common share is based on the weighted average number of common shares outstanding during each period. Diluted net income per common share is based on the weighted average number of common shares outstanding, plus, if dilutive, common share equivalents, which include outstanding stock options and restricted stock, and shares issuable for the conversion value of our convertible debt.
Net income per common share is calculated using the two-class method, which is an earnings allocation method for computing net income per common share when a company's capital structure includes common stock and participating securities. Our unvested restricted stock awards receive non-forfeitable dividends at the same rate as our common stock and therefore are considered participating securities. Under the two-class method, basic and diluted net income per common share is reduced for a presumed hypothetical distribution of earnings to holders of our unvested restricted stock.
The computation of basic and diluted net income per common share for the three and six months ended June 30, 2013 and 2012 is (in millions, except per share amounts):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Net Income Available for Common Shares:
 
 
 
 
 
 
 
Net income - Omnicom Group Inc.
$
289.5

 
$
282.7

 
$
494.7

 
$
487.3

Net income allocated to participating securities
(7.8
)
 
(6.4
)
 
(13.4
)
 
(10.9
)
 
 
 
 
 
 
 
 
 
$
281.7

 
$
276.3

 
$
481.3

 
$
476.4

 
 
 
 
 
 
 
 
Weighted Average Shares:
 
 
 
 
 
 
 
Basic
257.7

 
269.0

 
259.4

 
271.2

  Dilutive stock options and restricted shares and shares issuable for the conversion value of convertible debt
1.5

 
2.8

 
1.3

 
2.7

 
 
 
 
 
 
 
 
Diluted
259.2

 
271.8

 
260.7

 
273.9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Anti-dilutive stock options and restricted shares
0.1

 
0.2

 
0.1

 
0.3

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net Income per Common Share - Omnicom Group Inc.:
 
 
 
 
 
 
 
Basic
$
1.09

 
$
1.03

 
$
1.86

 
$
1.76

Diluted
$
1.09

 
$
1.02

 
$
1.85

 
$
1.74