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Earnings Per Share (Net Income Attributable To CME Group) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net Income Attributable to CME Group $ 711.0 $ 574.4
Dividends, Preferred Stock (4.6) 0.0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (4.4) 0.0
Net Income Attributable to Common Shareholders of CME Group $ 702.0 $ 574.4
Basic (in shares) 358,609 358,147
Effect of stock options, restricted stock and performance shares 571 670
Diluted (in shares) 359,180 358,817
Earnings per common share, basic (in dollars per share) $ 1.96 $ 1.60
Earnings per common share, diluted (in dollars per share) $ 1.95 $ 1.60