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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income attributable to CME Group $ 2,636.4 $ 2,105.2 $ 2,116.5
Preferred Stock Dividends, Income Statement Impact (19.0) 0.0 0.0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (0.3) 0.0 0.0
Net income $ 2,636.9 $ 2,106.4 $ 2,115.8
Basic 358,340 357,764 357,155
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 589 760 1,084
Diluted 358,929 358,524 358,239
Earnings per common share, basic $ 7.30 $ 5.88 $ 5.93
Earnings per common share, diluted $ 7.29 $ 5.87 $ 5.91
Outstanding anti-dilutive options 86 87 519
Net Income Attributable to Common Shareholders of CME Group $ 2,617.1 $ 2,105.2 $ 2,116.5
Restricted Stock [Member]      
Outstanding anti-dilutive options 86 87 519
Retained Earnings [Member]      
Net income attributable to CME Group $ 2,636.4 $ 2,105.2 $ 2,116.5