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REVENUE - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Disaggregation of Revenue [Line Items]          
Payment period     30 days    
Recognized revenue with related parties $ 1.9 $ 7.7 $ 9.5 $ 21.0  
Amounts receivable from related parties 3.0   3.0   $ 4.5
Due to related parties 34.6   34.6   0.0
Custodial fee revenue          
Disaggregation of Revenue [Line Items]          
Amounts receivable from customers, net of allowance 9.0   9.0   $ 22.4
Crypto asset sales revenue          
Disaggregation of Revenue [Line Items]          
Cost of crypto assets used in fulfilling customer transactions $ 0.2 $ 68.6 $ 0.5 $ 433.8