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Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income attributable to CME Group $ 2,691.0 $ 2,636.4 $ 2,105.2
Preferred Stock Dividends, Income Statement Impact (38.9) (19.0) 0.0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 5.1 (0.3) 0.0
Net income $ 2,691.0 $ 2,636.9 $ 2,106.4
Basic 358,713 358,340 357,764
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 468 589 760
Diluted 359,181 358,929 358,524
Earnings per common share, basic $ 7.41 $ 7.30 $ 5.88
Earnings per common share, diluted $ 7.40 $ 7.29 $ 5.87
Outstanding anti-dilutive options 158 86 87
Net Income Attributable to Common Shareholders of CME Group $ 2,657.2 $ 2,617.1 $ 2,105.2
Restricted Stock [Member]      
Outstanding anti-dilutive options 158 86 87
Retained Earnings [Member]      
Net income attributable to CME Group $ 2,691.0 $ 2,636.4 $ 2,105.2