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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, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |
Balance, beginning of period | $ 553.6 | $ 661.4
Settlements during the period | (29.8) | (36.4)
Fair value adjustments related to changes in the Company’s own credit risk | 111.3 | (68.4)
Other fair value adjustments | 108.2 | (3.0)
Balance, end of period | 743.3 | 553.6
Less: current portion( | (75.7) | (28.1)
Non-current portion of derivative financial liabilities | 667.6 | 525.5
Rainy River |  |
Disclosure of detailed information about financial instruments [line items] |  |
Balance, beginning of period | 174.7 | 194.0
Settlements during the period | (29.8) | (24.0)
Fair value adjustments related to changes in the Company’s own credit risk | 25.2 | (20.3)
Other fair value adjustments | 29.8 | 25.0
Balance, end of period | 199.9 | 174.7
Less: current portion( | (33.1) | (28.1)
Non-current portion of derivative financial liabilities | 166.8 | 146.6
New Afton |  |
Disclosure of detailed information about financial instruments [line items] |  |
Balance, beginning of period | 378.9 | 467.4
Settlements during the period | 0.0 | (12.4)
Fair value adjustments related to changes in the Company’s own credit risk | 86.1 | (48.1)
Other fair value adjustments | 78.4 | (28.0)
Balance, end of period | 543.4 | 378.9
Less: current portion( | (42.7) | 0.0
Non-current portion of derivative financial liabilities | $ 500.7 | $ 378.9

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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 2023-01-01 -Paragraph B13 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B13_b&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph m -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_m&doctype=Standard -URIDate 2023-03-23 + Details
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