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Non-current derivative financial liabilities - Change in stream obligation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items] |  |
Balance, beginning of period | $ 661.4 | $ 654.0
Proceeds received |  | 0.0
Settlements during the period | (36.4) | (31.6)
Fair value adjustments related to changes in the Company’s own credit risk | (68.4) | (23.9)
Other fair value adjustments | (3.0) | 62.9
Balance, end of period | 553.6 | 661.4
Less: current portion | (28.1) | (43.0)
Non-current portion of derivative financial liabilities | 525.5 | 618.4
Rainy River |  |
Disclosure of detailed information about financial instruments [line items] |  |
Balance, beginning of period | 194.0 | 217.9
Proceeds received |  | 0.0
Settlements during the period | (24.0) | (26.8)
Fair value adjustments related to changes in the Company’s own credit risk | (20.3) | (4.0)
Other fair value adjustments | 25.0 | 6.9
Balance, end of period | 174.7 | 194.0
Less: current portion | (28.1) | (30.3)
Non-current portion of derivative financial liabilities | 146.6 | 163.7
New Afton |  |
Disclosure of detailed information about financial instruments [line items] |  |
Balance, beginning of period | 467.4 | 436.1
Proceeds received |  | 0.0
Settlements during the period | (12.4) | (4.8)
Fair value adjustments related to changes in the Company’s own credit risk | (48.1) | (19.9)
Other fair value adjustments | (28.0) | 56.0
Balance, end of period | 378.9 | 467.4
Less: current portion | 0.0 | (12.7)
Non-current portion of derivative financial liabilities | $ 378.9 | $ 454.7

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- Definition The increase (decrease) in the fair value of a financial liability that is attributable to changes in the credit risk of that liability. [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 10A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_10A_a&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 10 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_10_a&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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- Definition The amount of current financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Other financial liabilities; Current financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph B13 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_B13_b&doctype=Appendix&subtype=B -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph m -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_m&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of non-current financial liabilities that the entity does not separately disclose in the same statement or note. [Refer: Other financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2022-03-24 -Paragraph B13 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_B13_c&doctype=Appendix&subtype=B -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph m -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_m&doctype=Standard -URIDate 2022-03-24 + Details
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