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Capital Stock (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) directors $ / shares shares | Dec. 31, 2020 $ / shares
Number of directors | directors | 23 |
Preferred Stock, Shares Issued | 4,600,000 |
Sale of Stock, Consideration Received on Transaction | $ | $ 965.0 |
Class A Common Stock (Shares) [Member] |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 | $ 0.01
Class B Common Stock (Shares) |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 | $ 0.01
Class B Common Stock, Class B1 [Member] |  |
Number of directors | 3 |
Class B Common Stock, Class B2 [Member] |  |
Number of directors | 2 |
Class B Common Stock, Class B3 [Member] |  |
Number of directors | 1 |
Class B common stock, Class B1, B2, B3 [Member] |  |
Number of directors | 6 |
Convertible Preferred Stock |  |
Stock Issued During Period, Shares, New Issues | 4,584,000 |
Sale of Stock, Consideration Received on Transaction | $ | $ 1,000.0 |
CME Group Omnibus Stock Plan [Member] |  |
Number of shares reserved for awards under the plan | 40,200,000 |
Director Stock Plan; Class A Shares [Member] |  |
Number of shares reserved for awards under the plan | 625,000 |
Employee Stock Purchase Plan; Class A Shares [Member] |  |
Number of shares reserved for awards under the plan | 500,000 |
Market value of the shares an Employee Stock Purchase Plan | 90.00% |
Class A shares Purchased under Employee Stock Purchase Plan | 390,000 |

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