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Commitments and Contingencies (Details) - USD ($) $ in Millions								12 Months Ended
	Jan. 06, 2025	Jun. 30, 2024	Jun. 20, 2024	Jun. 14, 2024	May 29, 2024	Mar. 11, 2024	Feb. 28, 2024	Dec. 31, 2024	Sep. 30, 2025	Apr. 02, 2025
Loss Contingencies [Line Items]
Estimated loss contingency accrued								$ 6.1	$ 1.0
Earn Program Related Litigation
Loss Contingencies [Line Items]
Court ordered stay of case period										60 days
GTC | Earn Program Related Litigation
Loss Contingencies [Line Items]
Expenses from litigation settlement								137.0
Settlement amount awarded to other party				$ 50.0
Percentage of assets as settlement amount awarded to other party				3.00%
Civil monetary penalty related to litigation settlement						$ 37.0
Bitcoin contributed in compliance with Consent Order						40.0
GTC | Earn Program Related Litigation | Gemini Earn Program Users
Loss Contingencies [Line Items]
Settlement amount awarded to other party							$ 40.0
Percentage of assets as settlement amount awarded to other party		3.00%
Bitcoin contributed for settlement agreement						$ 10.0
Crypto assets received in kind			$ 50.0
GTC | Earn Program Related Litigation | Genesis
Loss Contingencies [Line Items]
Recovery of claims amount			50.0
General unsecured creditor claim			$ 7.5
Book value of aggregate amounts received								29.5
GTC | Commodity Futures Trading Commission Litigation
Loss Contingencies [Line Items]
Settlement amount awarded to other party	$ 5.0
Gemini Earn Program Users | Earn Program Related Litigation | Gemini Earn Program Users
Loss Contingencies [Line Items]
Percentage of assets as settlement amount awarded to other party					97.00%
Gemini Earn Program Users | Earn Program Related Litigation | Genesis
Loss Contingencies [Line Items]
Crypto assets received in kind					$ 2,180.0
Credit card receivables
Loss Contingencies [Line Items]
Outstanding purchase commitments								$ 65.8	$ 150.6

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