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Earnings Per Share
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The company uses the two-class method to calculate basic and diluted earnings per common share because its Series G preferred stock are participating securities. Under the two-class method, undistributed earnings are allocated to common stock and participating securities according to their respective rights in undistributed earnings, as if all of the earnings for the period had been distributed. Basic earnings per common share is computed by dividing the net income attributable to common shareholders by the weighted average number of common shares outstanding during the period. Net income attributable to common shareholders is reduced for preferred stock dividends earned during the period. Preferred stock also receives a proportionate allocation of undistributed or overdistributed earnings for the period because Series G preferred stock has a contractual obligation to share in profits and losses of the company. Diluted earnings per share is computed by dividing the net income attributable to common shareholders by the weighted average number of common shares outstanding plus potentially dilutive common shares. Anti-dilutive stock awards were as follows for the periods presented:
Quarter Ended
June 30,		Six Months Ended
June 30,
(in thousands)2022202120222021
Stock awards128 1 130 117 
Total128 1 130 117 
The following table presents the earnings per share calculation for the periods presented:
 Quarter Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Net Income Attributable to CME Group (in millions)
$662.5 $510.3 $1,373.5 $1,084.7 
Less: preferred stock dividends(4.6)— (9.2)— 
Less: undistributed earnings allocated to preferred stock(3.8)— (8.2)— 
Net Income Attributable to Common Shareholders of CME Group$654.1 $510.3 $1,356.1 $1,084.7 
Weighted Average Number of Common Shares (in thousands):
Basic358,641 358,261 358,625 358,204 
Effect of stock options, restricted stock and performance shares564 627 554 649 
Diluted359,205 358,888 359,179 358,853 
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Basic$1.82 $1.42 $3.78 $3.03 
Diluted1.82 1.42 3.78 3.02