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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Basic And Diluted Earnings Per Share
 
 
Quarter Ended June 30,
 
Six Months Ended June 30,
(in millions, except shares and per share data)
 
2012
 
2011
 
2012
 
2011
Net Income Attributable to CME Group
 
$
244.9

 
$
293.7

 
$
511.5

 
$
750.3

Weighted Average Number of Common Shares (in thousands):
 
 
 
 
 
 
 
 
Basic
 
331,078

 
333,794

 
330,946

 
334,038

Effect of stock options and restricted stock awards
 
1,084

 
1,077

 
1,063

 
1,052

Diluted
 
332,162


334,871

 
332,009

 
335,090

Earnings per Common Share Attributable to CME Group:
 
 
 
 
 
 
 
 
Basic
 
$
0.74

 
$
0.88

 
$
1.55

 
$
2.25

Diluted
 
0.74

 
0.88

 
1.54

 
2.24