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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Dividends, Preferred Stock $ (5.7) $ (5.3) $ (11.5) $ (10.5)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (7.2) (5.8) (13.4) (11.4)
Net Income Attributable to Common Shareholders of CME Group $ 1,012.2 $ 872.1 $ 1,956.4 $ 1,716.5
Basic (in shares) 359,658 359,330 359,636 359,294
Effect of stock options, restricted stock and performance shares 697 539 661 558
Diluted (in shares) 360,355 359,869 360,297 359,852
Earnings per common share, basic (in dollars per share) $ 2.81 $ 2.43 $ 5.44 $ 4.78
Earnings per common share, diluted (in dollars per share) $ 2.81 $ 2.42 $ 5.43 $ 4.77