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Intangible Assets and Goodwill Intangible Assets and Goodwill (Components of Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Goodwill | $ 10,528.0 | $ 10,798.8 |
CBOT [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 5,066.4 | 5,066.4 | $ 5,066.4
Goodwill, Other Increase (Decrease) | 0.0 | 0.0 |
Disposal Group, Including Discontinued Operation, Goodwill | 0.0 | 0.0 |
NYMEX [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 2,462.2 | 2,462.2 | 2,462.2
Goodwill, Other Increase (Decrease) | 0.0 | 0.0 |
Disposal Group, Including Discontinued Operation, Goodwill | 0.0 | 0.0 |
NEX [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 2,959.0 | 3,229.8 | 3,173.5
Goodwill, Other Increase (Decrease) | (24.6) | 56.3 |
Disposal Group, Including Discontinued Operation, Goodwill | (246.2) | 0.0 |
Other CME Segments |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 40.4 | 40.4 | 40.4
Goodwill, Other Increase (Decrease) | 0.0 | 0.0 |
Disposal Group, Including Discontinued Operation, Goodwill | 0.0 | 0.0 |
CME Group Inc. |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 10,528.0 | 10,798.8 | $ 10,742.5
Goodwill, Other Increase (Decrease) | (24.6) | 56.3 |
Disposal Group, Including Discontinued Operation, Goodwill | $ (246.2) | $ 0.0 |

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