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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial liabilities (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	$ 33.0	$ 36.4
Realized (Gains) Losses during period	1.0	0.6
Adjustments	(16.2)	(16.2)
Settlements	(16.0)	(19.0)
Balance at End of Period	1.8	1.8
Contingent consideration liabilities
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	8.8	11.8
Realized (Gains) Losses during period	3.0	3.0
Settlements	(10.0)	(13.0)
Balance at End of Period	1.8	1.8
Cboe Digital restricted common units liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	18.4	18.7
Realized (Gains) Losses during period	(0.7)	(1.0)
Adjustments	(12.1)	(12.1)
Settlements	(5.6)	(5.6)
Cboe Digital warrant liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	5.8	5.9
Realized (Gains) Losses during period	(1.3)	(1.4)
Adjustments	(4.1)	(4.1)
Settlements	$ (0.4)	$ (0.4)

X

- Definition

Amount of adjustment in liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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