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Intangible Assets and Goodwill Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill [Line Items] |
Goodwill Disclosure [Text Block] | Goodwill activity consisted of the following for the years ended December 31, 2023 and 2022:
(in millions) |  | Balance at December 31, 2022 |  |  |  |  |  | Other Activity (1) |  | Balance at December 31, 2023
CBOT Holdings |  | $ | 5,066.4 |  |  |  |  |  |  | $ | — |  |  | $ | 5,066.4 |
NYMEX Holdings |  | 2,462.2 |  |  |  |  |  |  | — |  |  | 2,462.2 |
NEX |  | 2,913.5 |  |  |  |  |  |  | 17.3 |  |  | 2,930.8 |
Other |  | 40.4 |  |  |  |  |  |  | (4.5) |  |  | 35.9 |
Total Goodwill |  | $ | 10,482.5 |  |  |  |  |  |  | $ | 12.8 |  |  | $ | 10,495.3 |
(in millions) |  | Balance at December 31, 2021 |  |  |  |  |  | Other Activity (1) |  | Balance at December 31, 2022
CBOT Holdings |  | $ | 5,066.4 |  |  |  |  |  |  | $ | — |  |  | $ | 5,066.4 |
NYMEX Holdings |  | 2,462.2 |  |  |  |  |  |  | — |  |  | 2,462.2 |
NEX |  | 2,959.0 |  |  |  |  |  |  | (45.5) |  |  | 2,913.5 |
Other |  | 40.4 |  |  |  |  |  |  | — |  |  | 40.4 |
Total Goodwill |  | $ | 10,528.0 |  |  |  |  |  |  | $ | (45.5) |  |  | $ | 10,482.5 |
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