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Performance Bonds and Guaranty Fund Contributions (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) days	Dec. 31, 2021 USD ($)
Percentage share of cross-margining collateral	50.00%
Line of Credit, Guaranty Fund Collateral Available	$ 6,900.0
Days fully secured | days	364
Intraday settlements of cash performance bonds	$ 436.7	$ 156.4
Average daily clearing settlement	6,000.0
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	$ 124,900.0	$ 146,100.0

X

- Definition

Average Daily Clearing Settlement

+ References

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X

- Definition

Committed Line Of Credit Number Of Days Fully Secured

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- Definition

Corporate Contribution

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X

- Definition

Intraday settlements of cash performance bonds

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- Definition

Line of Credit Facility, Option to Increase, Maximum Borrowing Capacity

+ References

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X

- Definition

Line of Credit, Guaranty Fund Collateral Available

+ References

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- Definition

Percentage Share of Cross-margining Collateral

+ References

No definition available.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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