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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Dividends, Preferred Stock $ (5.7) $ (5.3) $ (17.2) $ (15.8)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (5.7) (6.2) (19.1) (17.6)
Net Income Attributable to Common Shareholders of CME Group $ 896.6 $ 901.3 $ 2,853.0 $ 2,617.8
Basic (in shares) 359,686 359,400 359,653 359,329
Effect of stock options, restricted stock and performance shares 736 589 677 570
Diluted (in shares) 360,422 359,989 360,330 359,899
Earnings per common share, basic (in dollars per share) $ 2.49 $ 2.51 $ 7.93 $ 7.29
Earnings per common share, diluted (in dollars per share) $ 2.49 $ 2.50 $ 7.92 $ 7.27