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Digital assets - Additional Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) Bitcoin | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) Bitcoin
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Number of bitcoin held | Bitcoin | 1,579 |  | 1,094
Aggregate cost of bitcoin | $ 113.2 |  | $ 67.9
Crypto asset number of restricted units | Bitcoin | 800 |  |
Digital Assets [Member] |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |
Remeasurement gain (loss) on bitcoin | $ (16.6) | $ 3.5 |
Realized gain (loss) | 0.5 | 0.9 |
Unrealized gain (loss) | $ 17.1 | $ 2.6 |

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