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FAIR VALUE MEASUREMENT - Narrative (Details) $ in Millions		3 Months Ended
	Nov. 18, 2022	Mar. 31, 2024 USD ($) item shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information
Contingent consideration liabilities		$ 8.8		$ 11.8
Other income, net		$ 4.6	$ 0.1
Number of other digital asset exchanges used to assess Cboe Digital asset pricing reasonableness | item		3
Cboe Digital Restricted Common Units
Segment Reporting Information
Restricted common units recognized contra revenue period	5 years
Other income, net		$ 0.3
Cboe Digital Incentive Program Units
Segment Reporting Information
Term of incentive program		2 years
Other income, net		$ 0.3
Cboe Digital Incentive Program Units | Maximum
Segment Reporting Information
Common units authorized | shares		20
Warrant
Segment Reporting Information
Other income, net		$ 0.1
Cboe Asia Pacific and Cboe Canada
Segment Reporting Information
Contingent consideration liabilities		8.8
Cboe Asia Pacific
Segment Reporting Information
Payment of contingent consideration		3.0
Recurring
Segment Reporting Information
Contingent consideration liabilities		$ 8.8		$ 11.8

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Number of other digital asset exchanges.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

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Amount of income (expense) related to nonoperating activities, classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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