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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Dividends, Preferred Stock $ (5.3) $ (5.1) $ (10.5) $ (10.1)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (5.8) (4.7) (11.4) (10.8)
Net Income Attributable to Common Shareholders of CME Group $ 872.1 $ 767.8 $ 1,716.5 $ 1,640.5
Basic (in shares) 359,330 358,940 359,294 358,937
Effect of stock options, restricted stock and performance shares 539 489 558 434
Diluted (in shares) 359,869 359,429 359,852 359,371
Earnings per common share, basic (in dollars per share) $ 2.43 $ 2.14 $ 4.78 $ 4.57
Earnings per common share, diluted (in dollars per share) $ 2.42 $ 2.14 $ 4.77 $ 4.56