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Performance Bonds and Guaranty Fund Contributions (Performance Bond Deposits and Security Deposits) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Letters of Credit Outstanding, Amount | $ 6,343.2 | $ 4,685.2
Performance Bond [Member] |  |
Letters of Credit Outstanding, Amount | 3,739.5 | 3,394.8
Delivery [Member] |  |
Letters of Credit Outstanding, Amount | $ 2,603.7 | $ 1,290.4

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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
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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: |