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EQUITY BASED COMPENSATION - Schedule of the Activity Related to the Compensatory Class B Units During the Respective Periods (Details) - Class B Unit Capital - Galaxy Digital Holdings, LP - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Class B Units        
Beginning balance (in shares) 10,711,587 10,792,944 10,792,944 14,890,203
Granted / transferred (in shares) 0 0 0 0
Exchanged (in shares) 0 (81,357)   (4,097,259)
Forfeited (in shares) 0 0 0 0
Ending balance (in shares) 10,711,587 10,711,587 10,792,944 10,792,944
Class B units exercisable (in shares) 10,711,587 10,711,587 10,777,718  
Weighted-Average Grant Date Fair Value (C$)        
Beginning balance (in cad per share) $ 1.49 $ 1.49 $ 1.49 $ 1.81
Granted / transferred (in cad per share) 0 0 0 0
Exchanged (in cad per share) 0 1.65   1.98
Forfeited (in cad per share) 0 0 0
Ending balance (in cad per shares)   1.49 1.49 $ 1.49
Class B units exercisable (in cad per share) $ 1.49 $ 1.49 $ 1.49