Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

Anti-dilutive stock awards were as follows for the periods presented:

	Quarter Ended March 31,
(in thousands)	2020	2019
Stock awards	68	76
Total	68	76

Basic And Diluted Earnings Per Share

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

	Quarter Ended March 31,
	2020		2019
Net Income Attributable to CME Group (in millions)	$	766.2	$	496.9
Weighted Average Number of Common Shares (in thousands):
Basic	357,524		356,886
Effect of stock options, restricted stock and performance shares	931		1,161
Diluted	358,455		358,047
Earnings per Common Share Attributable to CME Group:
Basic	$	2.14	$	1.39
Diluted	2.14		1.39