Stock-based compensation - Performance and deferred stock unit plan (Details) - $ / shares	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Performance restricted share units (PSUs)
Number of units
Beginning balance (in shares)	319,688	431,714
Granted (in shares)	204,303	101,597
Vested/ redeemed (in shares)	(61,935)	(213,623)
Forfeited (in shares)	(50,674)
Ending balance (in shares)	411,382	319,688
Weighted-average exercise price $ per share
Outstanding, beginning of period (in CAD per share)	$ 19.32	$ 12.47
Granted (in CAD per share)	26.32	25.62
Vested (in CAD per share)	20.14	8.48
Forfeited (in CAD per share)	20.14
Outstanding, end of period (in CAD per share)	$ 22.57	$ 19.32
Deferred stock units (DSUs) \| Deferred stock unit plan
Number of units
Beginning balance (in shares)	765,636	1,020,213
Granted (in shares)	35,945	31,575
Vested/ redeemed (in shares)	0	(286,152)
Ending balance (in shares)	801,581	765,636

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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