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ACQUISITIONS (Details) $ in Millions				3 Months Ended		6 Months Ended
	Jun. 01, 2022 USD ($)	May 02, 2022 USD ($)	Jul. 01, 2021 USD ($) item	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Acquisitions
Goodwill						$ 592.5
Contingent consideration liabilities				$ 102.1		102.1		$ 70.5
Acquisition-related costs				14.3	$ 1.8	16.3	$ 5.2
Professional fees				24.1	22.4	43.8	38.0
Impairment charge of goodwill				460.1		460.1
Cboe Asia Pacific
Acquisitions
Goodwill			$ 137.0
Intangible assets			73.8
Working capital			25.7
Contingent consideration liabilities			$ 53.0
Number of key capital markets | item			2
ErisX
Acquisitions
Goodwill		$ 460.1
Intangible assets		95.0
Working capital		9.2
Gain on change in fair value		$ 7.5
Impairment charge of goodwill						460.1
NEO
Acquisitions
Goodwill	$ 132.4
Intangible assets	130.1
Working capital	(6.9)
Contingent consideration liabilities	$ 54.3
Acquisitions
Acquisitions
Acquisition-related costs				$ 14.3	$ 1.8	$ 16.3	5.2
Professional fees							4.6
Impairment charge of goodwill							$ 0.6

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