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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
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

X

- 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

X

- Details

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

X

- Details

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