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CLEARING OPERATIONS - Valuation (Details)
$ / shares in Units, $ in Millions
Jun. 30, 2022
USD ($)
item
$ / shares
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities  
Fair Value $ 22.4
Bitcoin  
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities  
Number of Units | item 674
Valuation | $ / shares $ 18,720
Fair Value $ 12.6
Ethereum  
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities  
Number of Units | item 7,232
Valuation | $ / shares $ 1,010
Fair Value $ 7.3
Litecoin  
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities  
Number of Units | item 11,869
Valuation | $ / shares $ 51
Fair Value $ 0.6
Bitcoin Cash  
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities  
Number of Units | item 3,459
Valuation | $ / shares $ 99
Fair Value $ 0.4
USD Coin  
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities  
Number of Units | item 1,507,706
Valuation | $ / shares $ 1
Fair Value $ 1.5