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EQUITY BASED COMPENSATION - Narrative (Details)			3 Months Ended	12 Months Ended
	Mar. 29, 2023 $ / shares shares	Mar. 19, 2021 shares	Mar. 31, 2025	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vested in period, fair value					$ 300,000		$ 100,000		$ 1,800,000
General partners' capital account				$ 0	$ 0
Galaxy Digital Holdings, LP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average grant date fair value of options granted (in usd per share) | $ / shares					$ 6.99		$ 4.04		$ 10.86
Exercise of stock options (in shares) | shares					3,546,327		5,847,020		2,627,053
Intrinsic value					$ 39,900,000		$ 14,000,000		$ 19,000,000
Fair value of options vested					$ 20,300,000		$ 17,200,000		$ 21,600,000
Options and exercise price (in shares) | shares	1,875,000			19,865,008	19,865,008	22,263,973	22,263,973	27,652,543	27,652,543	30,413,345
Stock options modified awards (in shares) | shares	1,500,000
Exercised (in cad per share) | $ / shares	$ 6.75			$ 3.16		$ 3.73		$ 2.68
Unamortized stock-based compensation expense				$ 34,200,000	$ 34,200,000
Galaxy Digital Holdings, LP | Class B Unit Capital
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted / transferred (in shares) | shares					0		0		0
Galaxy Digital Holdings, LP | Minimum | Class B Unit Capital
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					2 years
Galaxy Digital Holdings, LP | Maximum | Class B Unit Capital
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					4 years
Galaxy Digital Holdings, LP | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unamortized weighted-average period					4 years 4 months 24 days
Galaxy Digital Holdings, LP | Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period		3 years
Granted / transferred (in shares) | shares		845,428
Unamortized stock-based compensation expense related to unvested restricted stock.				0	$ 0
Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unamortized weighted-average period					2 years 4 months 24 days
Granted / transferred (in shares) | shares					3,439,035		4,983,339		6,718,554
Unamortized stock-based compensation expense related to unvested restricted stock.				$ 48,400,000	$ 48,400,000
Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units) | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					3 years
Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units) | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					4 years
Equity Plans | Galaxy Digital Holdings, LP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period					5 years
Maximum number of shares reserved for issuance fixed (in shares) | shares				45,565,739	45,565,739
Long Term Incentive Plan | Galaxy Digital Holdings, LP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Maximum number of shares reserved for issuance fixed (in shares) | shares				48,290,478	48,290,478
Non-Treasury Share Unit Plan | Galaxy Digital Holdings, LP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Payment Arrangement, Expense, Tax Benefit					$ 2,300,000		$ 700,000		$ 3,700,000
Non-Treasury Share Unit Plan | Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted / transferred (in shares) | shares					240,164		375,783		830,305
Weighted average grant date fair value					$ 2,700,000		$ 1,200,000		$ 10,100,000
Outstanding liability related to cash settled units				$ 10,200,000	10,200,000	$ 4,300,000	4,300,000
Non-Treasury Share Unit Plan | Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units) | Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			3 years
Non-Treasury Share Unit Plan | Galaxy Digital Holdings, LP | Restricted Stock (Restricted Stock, Restricted Stock Units and Deferred Share Units) | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period			4 years
Non-Treasury Share Unit Plan | Galaxy Digital Holdings, LP | Stock Appreciation Rights (SARs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average grant date fair value					1,500,000		500,000
Outstanding liability related to cash settled units				$ 1,700,000	$ 1,700,000	$ 1,000,000	$ 1,000,000
Granted (SAARs) in shares) | shares					242,498		299,151
Vested weighted average period			3 years

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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