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Intangible Assets and Goodwill Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill [Line Items] |
Goodwill Disclosure [Text Block] | Goodwill activity consisted of the following for the years ended December 31, 2021 and 2020:
(in millions) |  | Balance at December 31, 2020 |  |  |  | Deconsolidation(1) |  | Other Activity (2) |  | Balance at December 31, 2021
CBOT Holdings |  | $ | 5,066.4 |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 5,066.4 |
NYMEX Holdings |  | 2,462.2 |  |  |  |  | — |  |  | — |  |  | 2,462.2 |
NEX |  | 3,229.8 |  |  |  |  | (246.2) |  |  | (24.6) |  |  | 2,959.0 |
Other |  | 40.4 |  |  |  |  | — |  |  | — |  |  | 40.4 |
Total Goodwill |  | $ | 10,798.8 |  |  |  |  | $ | (246.2) |  |  | $ | (24.6) |  |  | $ | 10,528.0 |
(in millions) |  | Balance at December 31, 2019 |  |  |  | Deconsolidation(1) |  | Other Activity (2) |  | Balance at December 31, 2020
CBOT Holdings |  | $ | 5,066.4 |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 5,066.4 |
NYMEX Holdings |  | 2,462.2 |  |  |  |  | — |  |  | — |  |  | 2,462.2 |
NEX |  | 3,173.5 |  |  |  |  | — |  |  | 56.3 |  |  | 3,229.8 |
Other |  | 40.4 |  |  |  |  | — |  |  | — |  |  | 40.4 |
Total Goodwill |  | $ | 10,742.5 |  |  |  |  | $ | — |  |  | $ | 56.3 |  |  | $ | 10,798.8 |
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- Definition The entire disclosure for goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2144439 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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