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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | Anti-dilutive stock awards were as follows for the years presented:
(in thousands) | 2021 |  | 2020 |  | 2019
Stock awards | 86 |  |  | 87 |  |  | 519 |
Total | 86 |  |  | 87 |  |  | 519 |
Basic and diluted earnings per share | The following table presents the earnings per share calculation for the years presented:
| 2021 |  | 2020 |  | 2019
Net Income Attributable to CME Group (in millions) | $ | 2,636.4 |  |  | $ | 2,105.2 |  |  | $ | 2,116.5 |
Less: Preferred stock dividends | (19.0) |  |  | — |  |  | — |
Less: Undistributed earnings allocated to preferred stock | (0.3) |  |  | — |  |  | — |
Net Income Attributable to Common Shareholders of CME Group | $ | 2,617.1 |  |  | $ | 2,105.2 |  |  | $ | 2,116.5 |
Weighted Average Common Shares Outstanding (in thousands): |  |  |  |  |
Basic | 358,340 |  |  | 357,764 |  |  | 357,155 |
Effect of stock options and stock awards | 589 |  |  | 760 |  |  | 1,084 |
Diluted | 358,929 |  |  | 358,524 |  |  | 358,239 |
Earnings per Common Share Attributable to Common Shareholders of CME Group: |  |  |  |  |
Basic | $ | 7.30 |  |  | $ | 5.88 |  |  | $ | 5.93 |
Diluted | 7.29 |  |  | 5.87 |  |  | 5.91 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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