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CLEARING OPERATIONS - Valuation (Details)
$ / shares in Units, $ in Millions
Mar. 31, 2023
USD ($)
item
$ / shares
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities      
Fair Value $ 42.0 $ 22.9 $ 22.4
Bitcoin      
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities      
Number of Units | item 842    
Valuation per Unit | $ / shares $ 28,396    
Fair Value $ 23.9    
Ethereum      
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities      
Number of Units | item 7,750    
Valuation per Unit | $ / shares $ 1,818    
Fair Value $ 14.1    
Litecoin      
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities      
Number of Units | item 24,324    
Valuation per Unit | $ / shares $ 90    
Fair Value $ 2.2    
Bitcoin Cash      
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities      
Number of Units | item 12,615    
Valuation per Unit | $ / shares $ 124    
Fair Value $ 1.5    
USD Coin      
Fair Value - Digital Assets - Safeguarded Assets and Safeguarded Liabilities      
Number of Units | item 298,282    
Valuation per Unit | $ / shares $ 1    
Fair Value $ 0.3