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INVESTMENTS - Schedule of investments and Other Equity Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total equity method investments | $ 292.0 |  | $ 215.4 |  |  | $ 292.0 | $ 215.4 |
Total other equity investments | 53.3 |  | 37.8 |  |  | 53.3 | 37.8 |
Total investments | 345.3 |  | 253.2 |  |  | 345.3 | 253.2 |
Amount invested during the period |  |  |  |  |  | 57.1 | 14.6 | $ 209.8
7Ridge Fund |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total equity method investments | 292.0 |  | 215.4 |  |  | 292.0 | 215.4 |
Investment in Eris Innovations Holdings, LLC |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | 20.0 |  | 20.0 |  |  | 20.0 | 20.0 |
Investment in Globacap Technology Limited |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | 16.0 |  |  |  |  | 16.0 |  |
Investment in CSD Br |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | 5.9 |  | 5.9 |  |  | 5.9 | 5.9 |
Amount invested during the period |  |  |  |  | $ 5.9 |  |  |
Investment in Coin Metrics Inc. |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | 5.0 |  | 5.0 |  |  | 5.0 | 5.0 |
Amount invested during the period |  |  |  |  | $ 5.0 |  |  |
Investment in Cboe Vest Financial Group, Inc. |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | 2.9 |  | 2.9 |  |  | 2.9 | 2.9 |
Investment in Effective Investing Limited |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments |  |  | 1.8 |  |  |  | 1.8 |
Amount invested during the period |  |  |  | $ 1.8 |  |  |  |
Investment in OCC |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | 0.3 |  | 0.3 |  |  | 0.3 | 0.3 |
Globacap Technology Limited |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Amount invested during the period |  | $ 16.0 |  |  |  |  |  |
Osaka Digital Exchange |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Amount invested during the period | 1.3 |  |  |  |  |  |  |
Other equity investments |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Total other equity investments | $ 3.2 |  | 1.9 |  |  | $ 3.2 | $ 1.9 |
StratiFi Technologies |  |  |  |  |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |  |  |  |  |
Amount invested during the period |  |  | $ 0.1 |  |  |  |  |

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