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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Dividends, Preferred Stock $ (5.1) $ (4.6) $ (10.1) $ (9.2)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (4.7) (3.8) (10.8) (8.2)
Net Income Attributable to Common Shareholders of CME Group $ 767.8 $ 654.1 $ 1,640.5 $ 1,356.1
Basic (in shares) 358,940 358,641 358,937 358,625
Effect of stock options, restricted stock and performance shares 489 564 434 554
Diluted (in shares) 359,429 359,205 359,371 359,179
Earnings per common share, basic (in dollars per share) $ 2.14 $ 1.82 $ 4.57 $ 3.78
Earnings per common share, diluted (in dollars per share) $ 2.14 $ 1.82 $ 4.56 $ 3.78