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INVESTMENTS (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Schedule of Cost and Equity Method Investments |  |  |  |
Total equity method investments | $ 321.3 |  |  | $ 292.0
Total other equity investments | 62.4 |  |  | 53.3
Total investments | 383.7 |  |  | 345.3
Investment in Japannext Co., Ltd. |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total other equity investments | 36.5 |  |  | 0.0
Investment in 7Ridge Investments 3 LP |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total equity method investments | 321.3 |  |  | 292.0
Investment in Eris Innovations Holdings, LLC |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total other equity investments | 9.5 |  |  | 20.0
Investment in Globacap Technology Limited |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total other equity investments | 0.0 |  |  | 16.0
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 | 4.4 |  |  | 5.0
Investment in Vest Group Inc. |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total other equity investments | 2.9 |  |  | 2.9
Investment in OCC |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total other equity investments | 0.3 |  |  | 0.3
Other equity investments |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Total other equity investments | 2.9 |  |  | 3.2
Globacap Technology Limited |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Impairment charge |  |  | $ 16.0 |
Osaka Digital Exchange |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Impairment charge |  |  |  | $ 1.3
StratiFi Technologies Inc. |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Impairment charge |  | $ 1.2 |  |
Eris Exchange Holdings, LLC and Coin Metrics |  |  |  |
Schedule of Cost and Equity Method Investments |  |  |  |
Impairment charge | $ 11.1 |  |  |

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