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Mining interests - Carrying amount (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Mining Interests |  |
Property, plant and equipment | $ 1,927.2 | $ 1,863.9
New Afton |  |
Mining Interests |  |
Property, plant and equipment | 1,032.3 | 922.4
Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 890.4 | 939.3
Other |  |
Mining Interests |  |
Property, plant and equipment | 4.5 | 2.2
Depletable |  |
Mining Interests |  |
Property, plant and equipment | 755.1 | 797.4
Depletable | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 373.5 | 402.8
Depletable | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 381.6 | 394.6
Depletable | Other |  |
Mining Interests |  |
Property, plant and equipment | 0.0 | 0.0
Non- depletable |  |
Mining Interests |  |
Property, plant and equipment | 367.2 | 237.9
Non- depletable | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 359.9 | 230.9
Non- depletable | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 6.2 | 5.9
Non- depletable | Other |  |
Mining Interests |  |
Property, plant and equipment | 1.1 | 1.1
Plant & equipment |  |
Mining Interests |  |
Property, plant and equipment | 692.4 | 739.5
Plant & equipment | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 275.2 | 271.5
Plant & equipment | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 413.8 | 466.9
Plant & equipment | Other |  |
Mining Interests |  |
Property, plant and equipment | 3.4 | 1.1
Construction in progress |  |
Mining Interests |  |
Property, plant and equipment | 112.5 | 89.1
Construction in progress | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 23.7 | 17.2
Construction in progress | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 88.8 | 71.9
Construction in progress | Other |  |
Mining Interests |  |
Property, plant and equipment | $ 0.0 | $ 0.0

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- Definition The amount of property, plant and equipment including right-of-use assets whose underlying assets would be presented as property, plant and equipment if they were owned. [Refer: Property, plant and equipment; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition . + References No definition available. + Details
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