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Earnings Per Share
12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Earnings Per Share
EARNINGS PER SHARE
Basic earnings per share is computed by dividing net income attributable to CME Group by the weighted average number of shares of all classes of common stock outstanding for each reporting period. Diluted earnings per share reflects the increase in shares using the treasury stock method to reflect the impact of an equivalent number of shares of common stock if stock options were exercised and restricted stock awards were converted into common stock. Anti-dilutive stock options and stock awards were as follows for the years presented:
(in thousands)
2016
 
2015
 
2014
Stock options
171

 
420

 
1,330

Stock awards
138

 
115

 
124

Total
309

 
535


1,454


The following table presents the earnings per share calculation for the years presented:
 
2016
 
2015
 
2014
Net Income Attributable to CME Group (in millions)
$
1,534.1

 
$
1,247.0

 
$
1,127.1

Weighted Average Common Shares Outstanding (in thousands):
 
 
 
 
 
Basic
337,496

 
336,224

 
334,409

Effect of stock options and stock awards
1,470

 
1,670

 
1,654

Diluted
338,966

 
337,894

 
336,063

Earnings per Common Share Attributable to CME Group:
 
 
 
 
 
Basic
$
4.55

 
$
3.71

 
$
3.37

Diluted
4.53

 
3.69

 
3.35