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FAIR VALUE MEASUREMENT - Changes in fair value of Level 3 financial liabilities (Details) - Level 3 $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	$ 36.4
Realized (Gains) Losses during period	(0.4)
Settlements	(3.0)
Balance at End of Period	33.0
Contingent consideration liabilities
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	11.8
Settlements	(3.0)
Balance at End of Period	8.8
Cboe Digital restricted common units liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	18.7
Realized (Gains) Losses during period	(0.3)
Balance at End of Period	18.4
Cboe Digital warrant liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	5.9
Realized (Gains) Losses during period	(0.1)
Balance at End of Period	$ 5.8

X

- Definition

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

+ References

No definition available.

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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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