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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Anti-dilutive stock awards were as follows for the years presented:
(in thousands)202320222021
Stock awards455 158 86 
Total455 158 86 
Basic and diluted earnings per share
The following table presents the earnings per share calculation for the years presented:
202320222021
Net Income Attributable to CME Group (in millions)$3,226.2 $2,691.0 $2,636.4 
Less: Preferred stock dividends(44.2)(38.9)(19.0)
Less: (Undistributed earnings) overdistributed earnings allocated to preferred stock3.6 5.1 (0.3)
Net Income Attributable to Common Shareholders of CME Group$3,185.6 $2,657.2 $2,617.1 
Weighted Average Common Shares Outstanding (in thousands):
Basic359,023 358,713 358,340 
Effect of stock options and stock awards 477 468 589 
Diluted359,500 359,181 358,929 
Earnings per Common Share Attributable to Common Shareholders of CME Group:
Basic$8.87 $7.41 $7.30 
Diluted8.86 7.40 7.29