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CLEARING OPERATIONS - Valuation (Details)
$ / shares in Units, $ in Millions
Sep. 30, 2023
USD ($)
item
$ / shares
Dec. 31, 2022
USD ($)
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Fair Value $ 40.2 $ 22.9
Bitcoin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 849  
Valuation per Unit | $ / shares $ 27,072  
Fair Value $ 23.0  
Ethereum    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 8,653  
Valuation per Unit | $ / shares $ 1,681  
Fair Value $ 14.5  
Litecoin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 16,613  
Valuation per Unit | $ / shares $ 66  
Fair Value $ 1.1  
Bitcoin Cash    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 3,673  
Valuation per Unit | $ / shares $ 236  
Fair Value $ 0.9  
USD Coin    
Digital Assets - Safeguarded Assets and Safeguarded Liabilities    
Number of Units | item 714,550  
Valuation per Unit | $ / shares $ 1  
Fair Value $ 0.7