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Performance Bonds and Guaranty Fund Contributions (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) days	Dec. 31, 2023 USD ($)
Percentage share of cross-margining collateral	50.00%
Line of Credit, Guaranty Fund Collateral Available	$ 10,100.0
Days fully secured | days	364
Intraday settlements of cash performance bonds	$ 198.4	$ 237.5
Average daily clearing settlement	5,700.0
364-day fully secured, committed line of credit
Line of Credit Facility, Maximum Borrowing Capacity	7,000.0
Option on increase in line of credit	10,000.0
Revolving senior credit facility
Line of Credit Facility, Maximum Borrowing Capacity	2,300.0
CME Base Guaranty Fund [Member]
Corporate Contribution	100.0
CME IRS Guaranty Fund [Member] [Member]
Corporate Contribution	150.0
Federal Reserve Reinvestment [Member]
Cash Equivalents, at Carrying Value	$ 87,400.0	$ 79,300.0

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Corporate Contribution

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Intraday settlements of cash performance bonds

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Percentage Share of Cross-margining Collateral

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section S99
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-Subparagraph (SX 210.5-02(1))
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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(22)(b))
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