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Earnings Per Share
 9 Months Ended
Sep. 30, 2024
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
September 30,		Nine Months Ended
September 30,
(in thousands)2024202320242023
Stock awards333 333 334 373 
Total333 333 334 373 
The following table presents the earnings per share calculation for the periods presented:
 Quarter Ended
September 30,		Nine Months Ended
September 30,
2024202320242023
Net Income (in millions)
$912.8 $750.2 $2,651.2 $2,411.6 
Less: preferred stock dividends(5.3)(5.0)(15.8)(15.1)
Less: undistributed earnings allocated to preferred stock(6.2)(4.4)(17.6)(15.2)
Net Income Attributable to Common Shareholders of CME Group$901.3 $740.8 $2,617.8 $2,381.3 
Weighted Average Number of Common Shares (in thousands):
Basic359,400 359,020 359,329 358,965 
Effect of stock options, restricted stock and performance shares589 599 570 483 
Diluted359,989 359,619 359,899 359,448 
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Basic$2.51 $2.06 $7.29 $6.63 
Diluted2.50 2.06 7.27 6.62