XML 93 R79.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Capital Stock (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 directors $ / shares shares | Dec. 31, 2022 $ / shares
Number of directors | directors | 23 |
Preferred Stock, Shares Issued | 4,600,000 |
Class A Common Stock (Shares) [Member] |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 | $ 0.01
Class B Common Stock (Shares) |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 | $ 0.01
Class B Common Stock, Class B1 [Member] |  |
Number of directors | 3 |
Class B Common Stock, Class B2 [Member] |  |
Number of directors | 2 |
Class B Common Stock, Class B3 [Member] |  |
Number of directors | 1 |
Class B common stock, Class B1, B2, B3 [Member] |  |
Number of directors | 6 |
CME Group Omnibus Stock Plan [Member] |  |
Number of shares reserved for awards under the plan | 40,200,000 |
Director Stock Plan; Class A Shares [Member] |  |
Number of shares reserved for awards under the plan | 725,000 |
Employee Stock Purchase Plan; Class A Shares [Member] |  |
Number of shares reserved for awards under the plan | 800,000 |
Market value of the shares an Employee Stock Purchase Plan | 90.00% |
Class A shares Purchased under Employee Stock Purchase Plan | 473,101 |

X
- Definition Market value of the shares an Employee Stock Purchase Plan + References No definition available. + Details
Name: | cme_MarketValueOfSharesEmployeeStockPurchasePlan
Namespace Prefix: | cme_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of directors + References No definition available. + Details
Name: | cme_NumberOfDirectors
Namespace Prefix: | cme_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480489/718-40-50-1 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_PreferredStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=cme_ClassBCommonStockClassB1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=cme_ClassBCommonStockClassB2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=cme_ClassBCommonStockClassB3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=cme_ClassBCommonStockClassB1B2B3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=cme_CmeGroupOmnibusStockPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=cme_DirectorStockPlanClassSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=cme_EmployeeStockPurchasePlanClassSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |