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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2021
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
June 30,
Six Months Ended
June 30,
(in thousands)2021202020212020
Stock awards75 117 76 
Total75 117 76 
Basic And Diluted Earnings Per Share
The following table presents the earnings per share calculation for the periods presented:
 Quarter Ended
June 30,
Six Months Ended
June 30,
2021202020212020
Net Income Attributable to CME Group (in millions)$510.3 $503.3 $1,084.7 $1,269.5 
Weighted Average Number of Common Shares (in thousands):
Basic358,261 357,691 358,204 357,607 
Effect of stock options, restricted stock and performance shares627 766 649 846 
Diluted358,888 358,457 358,853 358,453 
Earnings per Common Share Attributable to CME Group:
Basic$1.42 $1.41 $3.03 $3.55 
Diluted1.42 1.40 3.02 3.54