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Capital Stock (Capital stock) (Details) - shares | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 1,117,459 | 1,115,055 |  |
Class A Common Stock |  |  |  |
Common Stock, Shares Authorized | 1,000,000,000 | 1,000,000,000 |  |
Common Stock, Shares, Outstanding | 358,929,000 | 358,599,000 | 358,110,000 | 357,469,000
Class B Common Stock, Class B1 [Member] |  |  |  |
Common Stock, Shares, Outstanding | 600 | 600 |  |
Class B Common Stock, Class B2 [Member] |  |  |  |
Common Stock, Shares, Outstanding | 800 | 800 |  |
Class B Common Stock, Class B3 [Member] |  |  |  |
Common Stock, Shares, Outstanding | 1,300 | 1,300 |  |
Class B Common Stock, Class B4 [Member] |  |  |  |
Common Stock, Shares, Outstanding | 400 | 400 |  |
Convertible Preferred Stock |  |  |  |
Common Stock, Shares, Outstanding | 4,584,000 | 4,584,000 | 0 |
Preferred Stock, Shares Authorized | 10,000,000 | 10,000,000 |  |
Preferred Stock, Shares Outstanding | 4,584,000 | 4,584,000 |  |
CME Group Omnibus Stock Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 25,400,000 |  |  |
Director Stock Plan; Class A Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 449,000 |  |  |

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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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