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INVESTMENTS - Other Equity Investments (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Aug. 31, 2020	May 31, 2020	Jan. 31, 2016	Dec. 31, 2021	Dec. 31, 2020
Other Equity Investments
Impairment of investments				$ 5.6	$ 15.1
Investment in OCC
Other Equity Investments
Investment percentage				20.00%
Investment in Cboe Vest Financial Group, Inc.
Other Equity Investments
Other equity investments			$ 18.9
Payments made to former share holder			14.9
Payments made to Vest for newly issued shares			$ 4.0
Ownership percentage			60.00%
Investment in Cboe Vest Financial Group, Inc. | Put Option
Other Equity Investments
Option exercise period			5 years
Investment in Cboe Vest Financial Group, Inc. | Call Option
Other Equity Investments
Option exercise period			5 years
Investment in Eris Digital Holdings, LLC
Other Equity Investments
Recognized gain or loss on restructuring		$ 0.0
Investment in American Financial Exchange, LLC
Other Equity Investments
Impairment of investments	$ 4.1

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