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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