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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Dividends, Preferred Stock $ (5.3) $ (5.0) $ (15.8) $ (15.1)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (6.2) (4.4) (17.6) (15.2)
Net Income Attributable to Common Shareholders of CME Group $ 901.3 $ 740.8 $ 2,617.8 $ 2,381.3
Basic (in shares) 359,400 359,020 359,329 358,965
Effect of stock options, restricted stock and performance shares 589 599 570 483
Diluted (in shares) 359,989 359,619 359,899 359,448
Earnings per common share, basic (in dollars per share) $ 2.51 $ 2.06 $ 7.29 $ 6.63
Earnings per common share, diluted (in dollars per share) $ 2.50 $ 2.06 $ 7.27 $ 6.62