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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
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Dividends, Preferred Stock $ (5.3) $ (5.0)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (5.5) (6.1)
Net Income Attributable to Common Shareholders of CME Group $ 844.4 $ 872.7
Basic (in shares) 359,258 358,933
Effect of stock options, restricted stock and performance shares 575 380
Diluted (in shares) 359,833 359,313
Earnings per common share, basic (in dollars per share) $ 2.35 $ 2.43
Earnings per common share, diluted (in dollars per share) $ 2.35 $ 2.43