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Earnings Per Share
 12 Months Ended
Dec. 31, 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. Series G 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 years presented:
(in thousands)202420232022
Stock awards89 455 158 
Total89 455 158 
The following table presents the earnings per share calculation for the years presented:
202420232022
Net Income Attributable to CME Group (in millions)$3,525.8 $3,226.2 $2,691.0 
Less: Preferred stock dividends(47.7)(44.2)(38.9)
Less: (Undistributed earnings) overdistributed earnings allocated to preferred stock3.4 3.6 5.1 
Net Income Attributable to Common Shareholders of CME Group$3,481.5 $3,185.6 $2,657.2 
Weighted Average Common Shares Outstanding (in thousands):
Basic359,389 359,023 358,713 
Effect of stock options and stock awards 555 477 468 
Diluted359,944 359,500 359,181 
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Basic$9.69 $8.87 $7.41 
Diluted9.67 8.86 7.40