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Performance Bonds and Guaranty Fund Contributions (Performance Bond Deposits and Security Deposits) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Letters of Credit Outstanding, Amount | $ 7,760.7 | $ 8,548.1
Performance Bond [Member] |  |
Letters of Credit Outstanding, Amount | 4,254.8 | 3,916.7
Delivery [Member] |  |
Letters of Credit Outstanding, Amount | $ 3,505.9 | $ 4,631.4

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=cme_PerformanceBondMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=cme_DeliveryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |