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INVESTMENTS - Schedule of investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Schedule of Cost and Equity Method Investments
Equity method investments:	$ 209.5	$ 2.0
Other equity investments	36.3	40.7
Total investments	245.8	42.7
Investment in Signal Trading Systems, LLC
Schedule of Cost and Equity Method Investments
Equity method investments:		2.0
Investment in 7Ridge Investments 3 LP
Schedule of Cost and Equity Method Investments
Equity method investments:	209.5
Investment in Eris Exchange Holdings, LLC
Schedule of Cost and Equity Method Investments
Other equity investments	20.0	20.0
Investment in American Financial Exchange, LLC
Schedule of Cost and Equity Method Investments
Other equity investments	10.6	10.6
Investment in Cboe Vest Financial Group, Inc.
Schedule of Cost and Equity Method Investments
Other equity investments	2.9	2.9
Investment in Eris Digital Holdings, LLC
Schedule of Cost and Equity Method Investments
Other equity investments	1.1	0.8
Investment in OCC
Schedule of Cost and Equity Method Investments
Other equity investments	$ 0.3	0.3
Investment percentage	20.00%
Other equity investments
Schedule of Cost and Equity Method Investments
Other equity investments	$ 1.4	$ 6.1

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 323
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