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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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