Shareholder's capital - Schedule of Bonus Deferral RSUs (Details) - shares	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Treasury Stock, Common
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued from treasury to settles RSUs and PSUs (in shares)	6,147	31,455
Common shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity other than options settled at cash value for payment of the exercise price and for tax withholdings (in shares)	7,085	37,660
Retirement Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested (percent)	100.00%
Bonus Deferral Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period (in shares)	51,776	77,981
Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period (in shares)	601,838	724,583
Common stock, shares issued (in shares)	13,232	69,115
Awards outstanding (in shares)	205,896	167,352

Share-based Payment Arrangement, Shares Withheld as Payment for the Exercise Price and for Tax Withholding Obligation

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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