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CLEARING OPERATIONS - Valuation (Details)
$ / shares in Units, $ in Millions
Jun. 30, 2023
USD ($)
item
$ / shares
Dec. 31, 2022
USD ($)
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Fair Value $ 54.9 $ 22.9
Bitcoin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 1,063  
Valuation per Unit | $ / shares $ 30,390  
Fair Value $ 32.3  
Ethereum    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 8,733  
Valuation per Unit | $ / shares $ 1,927  
Fair Value $ 16.8  
Litecoin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 22,811  
Valuation per Unit | $ / shares $ 107  
Fair Value $ 2.5  
Bitcoin Cash    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 8,130  
Valuation per Unit | $ / shares $ 301  
Fair Value $ 2.4  
USD Coin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 860,955  
Valuation per Unit | $ / shares $ 1  
Fair Value $ 0.9