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Net earnings (loss) per share (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of earnings per share [Abstract] |  |
Description of anti-dilutive effect excluded from computation of earnings per share | For the year ended December 31, 2022, 0.9 million share options and the 13.1 million common shares underlying the convertible debentures (which were repaid on December 31, 2022) were excluded from the computation of diluted earnings per share as their effect was anti-dilutive. | For the year ended December 31, 2021, 0.8 million share options, 5.5 million outstanding warrants and the 15.7 million common shares underlying the convertible debentures were excluded from the computation of diluted earnings per share as their effect was antidilutive.

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- Definition The description of instruments (including contingently issuable shares) that could potentially dilute basic earnings per share in the future, but were not included in the calculation of diluted earnings per share because they are antidilutive for the period(s) presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2022-03-24 -Paragraph 70 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2022-en-r&anchor=para_70_c&doctype=Standard -URIDate 2022-03-24 + Details
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- References No definition available. + Details
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