Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

Anti-dilutive stock options, restricted stock and performance share awards were as follows for the periods presented:

	Quarter Ended September 30,		Nine Months Ended September 30,
(in thousands)	2015	2014	2015	2014
Stock options	432	1,461	432	1,463
Restricted stock and performance shares	—	700	538	700
Total	432	2,161	970	2,163

Basic And Diluted Earnings Per Share

The following table presents the earnings per share calculation for the periods presented:

	Quarter Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Net Income Attributable to CME Group (in millions)	$	359.9	$	290.0	$	955.3	$	820.6
Weighted Average Number of Common Shares (in thousands):
Basic	336,323		334,424		336,015		334,144
Effect of stock options, restricted stock and performance shares	1,816		1,748		1,789		1,676
Diluted	338,139		336,172		337,804		335,820
Earnings per Common Share Attributable to CME Group:
Basic	$	1.07	$	0.87	$	2.84	$	2.46
Diluted	1.06		0.86		2.83		2.44