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INVESTMENTS - Schedule of investments and Other Equity Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total equity method investments |  | $ 215.4 |  |  | $ 209.5
Total other equity investments |  | 37.8 |  |  | 36.3
Total investments |  | 253.2 |  |  | 245.8
Investment in 7Ridge Investments 3 LP |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total equity method investments |  | 215.4 |  |  | 209.5
Investment in Eris Exchange Holdings, LLC |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | 20.0 |  |  | 20.0
Investment in CSD Br |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | 5.9 |  | $ 5.9 |
Investment in Coin Metrics Inc. |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | 5.0 |  | $ 5.0 |
Investment in Cboe Vest Financial Group, Inc. |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | 2.9 |  |  | 2.9
Investment in Effective Investing Limited |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | 1.8 | $ 1.8 |  |
Investment in OCC |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | $ 0.3 |  |  | 0.3
Investment percentage |  | 20.00% |  |  |
Investment in American Financial Exchange, LLC |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  |  |  |  | 10.6
Investment in Eris Digital Holdings, LLC |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  |  |  |  | 1.1
Recognized gain or loss on restructuring | $ 0.0 |  |  |  |
Other equity investments |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | $ 1.9 |  |  | $ 1.4
StratiFi Technologies |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |
Total other equity investments |  | $ 0.1 |  |  |

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