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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net Income Attributable to CME Group $ 662.5 $ 510.3 $ 1,373.5 $ 1,084.7
Dividends, Preferred Stock (4.6) 0.0 (9.2) 0.0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (3.8) 0.0 (8.2) 0.0
Net Income Attributable to Common Shareholders of CME Group $ 654.1 $ 510.3 $ 1,356.1 $ 1,084.7
Basic (in shares) 358,641 358,261 358,625 358,204
Effect of stock options, restricted stock and performance shares 564 627 554 649
Diluted (in shares) 359,205 358,888 359,179 358,853
Earnings per common share, basic (in dollars per share) $ 1.82 $ 1.42 $ 3.78 $ 3.03
Earnings per common share, diluted (in dollars per share) $ 1.82 $ 1.42 $ 3.78 $ 3.02