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Income taxes - Changes in Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unrecognized tax benefits:
Amount at beginning of year	$ 2.8	$ 3.5	$ 6.4
Net increase (decrease):
Tax positions taken in current period	0.5	0.5	0.7
Lapse due to applicable statute of limitations		(1.2)	(3.4)
Changes in currency exchange rates	(0.1)		(0.2)
Amount at end of year	$ 3.2	$ 2.8	$ 3.5

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of unrecognized tax benefits.

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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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Unrecognized tax benefits increases decreases.

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The increase or decrease in the unrecognized tax benefits for uncertain tax positions during the reporting period related to currency translations.

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