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Mining interests - Carrying amount (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Mining Interests |  |
Property, plant and equipment | $ 1,787.9 | $ 1,828.3
New Afton |  |
Mining Interests |  |
Property, plant and equipment | 818.6 | 687.8
Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 966.7 | 987.2
Other |  |
Mining Interests |  |
Property, plant and equipment | 2.6 | 153.3
Depletable |  |
Mining Interests |  |
Property, plant and equipment | 740.2 | 660.3
Depletable | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 396.5 | 382.9
Depletable | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 343.7 | 277.4
Depletable | Other |  |
Mining Interests |  |
Property, plant and equipment | 0.0 | 0.0
Non- depletable |  |
Mining Interests |  |
Property, plant and equipment | 261.0 | 300.4
Non- depletable | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 224.0 | 127.5
Non- depletable | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 35.9 | 21.8
Non- depletable | Other |  |
Mining Interests |  |
Property, plant and equipment | 1.1 | 151.1
Plant & equipment |  |
Mining Interests |  |
Property, plant and equipment | 668.6 | 710.6
Plant & equipment | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 154.0 | 150.0
Plant & equipment | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 513.1 | 558.4
Plant & equipment | Other |  |
Mining Interests |  |
Property, plant and equipment | 1.5 | 2.2
Construction in progress |  |
Mining Interests |  |
Property, plant and equipment | 118.1 | 157.0
Construction in progress | New Afton |  |
Mining Interests |  |
Property, plant and equipment | 44.1 | 27.4
Construction in progress | Rainy River |  |
Mining Interests |  |
Property, plant and equipment | 74.0 | 129.6
Construction in progress | Other |  |
Mining Interests |  |
Property, plant and equipment | $ 0.0 | $ 0.0

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_a&doctype=Standard -URIDate 2021-03-24 + Details
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