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FAIR VALUE MEASUREMENT - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2024	May 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information
Contingent consideration liabilities	$ 1.8		$ 1.8		$ 1.8		$ 11.8
Other (expense) income, net			(13.1)	$ 1.6	(8.5)	$ 1.7
Loss on settlement of contingent consideration					3.0
Cboe Digital Restricted Common Units
Segment Reporting Information
Other (expense) income, net			(0.3)
Cboe Asia Pacific
Segment Reporting Information
Payment of contingent consideration			10.0
Loss on settlement of contingent consideration	(2.7)				3.0
Cboe Canada
Segment Reporting Information
Contingent consideration liabilities	1.8		1.8		1.8
Cboe Japan
Segment Reporting Information
Payment of contingent consideration		$ 5.7
Recurring
Segment Reporting Information
Contingent consideration liabilities	$ 1.8		$ 1.8		$ 1.8		$ 11.8

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- Definition

Gain (Loss) on Settlement of Contingent Consideration

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- Definition

The cash outflow associated with the payment of contingent consideration from acquisitions.

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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479668/805-30-25-6

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Subparagraph (b)
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479613/805-30-35-1

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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
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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