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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, 2023 USD ($)
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	$ 60.5
Adjustments	0.1
Settlements	(4.9)
Balance at End of Period	55.7
Contingent consideration liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	39.1
Settlements	(4.9)
Balance at End of Period	34.2
Cboe Digital restricted common units liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	15.5
Adjustments	0.1
Balance at End of Period	15.6
Cboe Digital warrant liability
Changes in fair value of level 3 financial liabilities
Balance at Beginning of Period	5.9
Balance at End of Period	$ 5.9

X

- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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