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INVESTMENTS - Schedule of investments (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Schedule of Cost and Equity Method Investments |  |
Equity method investments: |  | $ 2.0
Other equity investments: | $ 36.0 | 40.7
Total investments | 36.0 | 42.7
Investment in Signal Trading Systems, LLC |  |
Schedule of Cost and Equity Method Investments |  |
Equity method investments: |  | $ 2.0
Ownership percentage |  | 50.00%
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: | 1.2 | 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: | $ 1.0 | $ 6.1

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