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Intangible Assets and Goodwill Intangible Assets and Goodwill (Components of Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Goodwill | $ 10,482.5 | $ 10,528.0 |
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 | 2,913.5 | 2,959.0 | 3,229.8
Goodwill, Other Increase (Decrease) | (45.5) | (24.6) |
Disposal Group, Including Discontinued Operation, Goodwill | 0.0 | (246.2) |
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 | 10,482.5 | 10,528.0 | $ 10,798.8
Goodwill, Other Increase (Decrease) | (45.5) | (24.6) |
Disposal Group, Including Discontinued Operation, Goodwill | $ 0.0 | $ (246.2) |

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