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Share capital - Common shares issued and outstanding (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of classes of share capital [abstract] |  |
Beginning balance (in shares) | 681,146 | 680,250
Common shares, beginning of period | $ 3,155.4 | $ 3,154.0
Issuance of common shares under First Nations agreements (in shares) | 375 | 250
Issuance of shares under First Nations agreements and land purchases | $ 0.5 | $ 0.4
Exercise of options and vested performance share units (in shares) | 755 | 646
Exercise of options and vested performance share units | $ 1.2 | $ 1.0
Ending balance (in shares) | 682,277 | 681,146
Common shares, end of period | $ 3,157.1 | $ 3,155.4

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- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_e&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The number of share vested and options exercised in a share-based payment arrangement. + References No definition available. + Details
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- Definition The increase (decrease) in equity resulting from the exercise of options and vested. + References No definition available. + Details
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- Definition Number of shares issued under agreement. + References No definition available. + Details
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- Definition The total value of shares issued under the agreement. + References No definition available. + Details
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