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CLEARING OPERATIONS - Valuation (Details) $ / shares in Units, $ in Millions | Dec. 31, 2023 USD ($) item $ / shares | Dec. 31, 2022 USD ($) item $ / shares | Jun. 30, 2022 USD ($)
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Digital Assets - Safeguarded Assets and Safeguarded Liabilities |  |  |
Fair Value | $ 51.3 | $ 22.9 | $ 22.4
Bitcoin |  |  |
Digital Assets - Safeguarded Assets and Safeguarded Liabilities |  |  |
Number of Units | item | 821 | 717 |
Valuation per Unit | $ / shares | $ 42,492 | $ 16,540 |
Fair Value | $ 34.9 | $ 11.8 |
Ethereum |  |  |
Digital Assets - Safeguarded Assets and Safeguarded Liabilities |  |  |
Number of Units | item | 6,270 | 6,362 |
Valuation per Unit | $ / shares | $ 2,282 | $ 1,199 |
Fair Value | $ 14.3 | $ 7.6 |
Litecoin |  |  |
Digital Assets - Safeguarded Assets and Safeguarded Liabilities |  |  |
Number of Units | item | 16,329 | 17,873 |
Valuation per Unit | $ / shares | $ 74 | $ 70 |
Fair Value | $ 1.2 | $ 1.3 |
Bitcoin Cash |  |  |
Digital Assets - Safeguarded Assets and Safeguarded Liabilities |  |  |
Number of Units | item | 1,374 | 6,883 |
Valuation per Unit | $ / shares | $ 261 | $ 97 |
Fair Value | $ 0.4 | $ 0.7 |
USD Coin |  |  |
Digital Assets - Safeguarded Assets and Safeguarded Liabilities |  |  |
Number of Units | item | 506,652 | 1,516,479 |
Valuation per Unit | $ / shares | $ 1 | $ 1 |
Fair Value | $ 0.5 | $ 1.5 |

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