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ACQUISITIONS (Details) $ in Millions			12 Months Ended
	May 02, 2022 USD ($)	Jul. 01, 2021 USD ($) item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Acquisitions
Goodwill			$ 592.5	$ 134.0
Contingent consideration liabilities			39.1	70.5
Acquisition-related costs			19.9	15.6	$ 45.2
Professional fees			89.0	83.7	60.6
Acquisitions
Acquisitions
Acquisition-related costs			$ 19.9	15.6	45.3
Professional fees				15.0	22.1
Impairment of investment					15.1
Impairment facilities charges				$ 0.6	$ 8.1
Cboe Asia Pacific
Acquisitions
Number of key capital markets | item		2
Goodwill		$ 137.0
Intangible assets		73.8
Working capital		25.7
Contingent consideration liabilities		$ 53.0
Cboe Digital
Acquisitions
Goodwill	$ 460.9
Intangible assets	95.0
Working capital	8.4
Gain on change in fair value	$ 7.5

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Amount of working capital assumed at the acquisition date.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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