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Share capital - Common shares issued and outstanding (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of classes of share capital [abstract] |  |
Beginning balance (in shares) | 682,277,000 | 681,146,000
Common shares, beginning of period | $ 3,157.1 | $ 3,155.4
Issuance of common shares under First Nations agreements (in shares) | 181,000 | 375,000
Issuance of shares under First Nations agreements and land purchases | $ 0.1 | $ 0.5
Issuance of flow through shares (in shares) | 1,642,037 |
Issuance of flow through shares | $ 2.3 | $ 0.0
Exercise of options and vested performance share units (in shares) | 2,906,000 | 756,000
Exercise of options and vested performance share units | $ 4.0 | $ 1.2
Ending balance (in shares) | 687,006,000 | 682,277,000
Common shares, end of period | $ 3,163.5 | $ 3,157.1
Proceeds from issuing shares | 3.0 |
Share premium through flow-through financing | $ 0.7 |

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- Definition The cash inflow from issuing shares. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17_a&doctype=Standard -URIDate 2023-03-23 + Details
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