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Significant accounting policies - Stock-based compensation (Details)	12 Months Ended
	Dec. 31, 2024 d
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trading days used to determine weighted average trading price of common shares	5
Restricted Share Unit (RSU)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award service period	2 years
Award vesting period	3 years
Compensation expense recognition period	3 years
Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Compensation expense recognition period	3 years

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Trading Days Used to Calculate Weighted Average Trading Price of Common Stock

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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