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Digital assets - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) Bitcoin | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) Bitcoin | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) Bitcoin
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Number of bitcoin held | Bitcoin | 1,575 |  | 1,575 |  | 1,094
Aggregate cost of bitcoin | $ 114.3 |  | $ 114.3 |  | $ 67.9
Crypto asset number of restricted units | Bitcoin | 800 |  | 800 |  |
Digital Assets [Member] |  |  |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Remeasurement gain (loss) on bitcoin | $ 10.9 | $ 0.8 | $ 33.2 | $ 2.3 |
Realized gain (loss) | 0.9 | 0.4 | 2.0 | 1.9 |
Unrealized gain (loss) | $ 10.0 | $ 0.4 | $ 31.2 | $ 0.4 |

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