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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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