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Leases (Details)	Sep. 30, 2025
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	13
Lessee, Operating Lease, Renewal Term	5
Lessee, Operating Lease, Option to Terminate	12
Lessee, Operating Lease, Term of Contract	12

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- Definition

Operating Lease, Option to Early Terminate, Months

+ References

No definition available.

+ Details

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X

- Definition

Operating Lease, Remaining Lease Term

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Operating Lease Renewal Term

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Operating Lease Term of Contract

+ References

No definition available.

+ Details

Name:	cme_OperatingLeaseTermofContract
Namespace Prefix:	cme_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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