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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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