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Fair value measurement - Summary of financial assets and liabilities by category (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | $ 151.9 | $ 154.2
Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 404.0 | 406.0
Fuel hedge swap contracts |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.0 | 1.1
Rainy River gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 217.2 | 199.9
New Afton free cash flow interest obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.0 | 543.4
Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 105.2 | 185.5
Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 25.0 | 16.6
Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 5.1 | 7.1
Financial liabilities at amortized cost | Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 151.9 | 154.2
Financial liabilities at amortized cost | Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 397.0 | 396.0
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Fuel hedge swap contracts |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.0 | 1.1
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Foreign exchange forward contracts |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 5.3 | 0.0
Financial instruments at FVTPL | Level 3 of fair value hierarchy | Rainy River gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 217.2 | 199.9
Financial instruments at FVTPL | Level 3 of fair value hierarchy | New Afton free cash flow interest obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 0.0 | 543.4
Financial assets at amortized cost | Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 105.2 | 185.5
Financial assets at amortized cost | Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 25.0 | 16.6
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Provisionally priced contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | (0.5) | 0.6
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Gold and copper swap contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 1.7 | (0.9)
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Foreign exchange forward contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.0 | 3.2
Financial instruments at FVTPL | Level 1 of fair value hierarchy | Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | $ 5.1 | $ 7.1

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