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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net Income Attributable to CME Group $ 679.6 $ 926.5 $ 2,053.1 $ 2,011.2
Dividends, Preferred Stock (4.6) 0.0 (13.8) 0.0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (3.9) 0.0 (12.1) 0.0
Net Income Attributable to Common Shareholders of CME Group $ 671.1 $ 926.5 $ 2,027.2 $ 2,011.2
Basic (in shares) 358,715 358,363 358,655 358,258
Effect of stock options, restricted stock and performance shares 573 625 551 636
Diluted (in shares) 359,288 358,988 359,206 358,894
Earnings per common share, basic (in dollars per share) $ 1.87 $ 2.59 $ 5.65 $ 5.61
Earnings per common share, diluted (in dollars per share) $ 1.87 $ 2.58 $ 5.64 $ 5.60