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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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Remeasurement gain (loss) on bitcoin.

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- Definition

Cost of crypto asset. Excludes crypto asset held for platform user.

+ References

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Number of crypto asset units held subject to contractual sale restriction. Excludes crypto asset units held for platform user.

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Number of restricted and unrestricted crypto asset units held. Excludes crypto asset units held for platform user.

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Amount of realized gain (loss) from remeasurement of crypto asset, classified as operating. Excludes crypto asset held for platform user.

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Amount of unrealized gain (loss) from remeasurement of crypto asset, classified as operating. Excludes crypto asset held for platform user.

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