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Fair value measurement - Summary of financial assets and liabilities by category (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | $ 154.2 | $ 141.1
Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 406.0 | 355.0
Fuel hedge swap contracts |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 1.1 | 0.0
Rainy River gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 199.9 | 174.7
New Afton free cash flow interest obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 543.4 | 378.9
Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 185.5 | 200.8
Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 16.6 | 15.9
Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 7.1 | 35.6
Financial liabilities at amortized cost | Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 154.2 | 141.1
Financial liabilities at amortized cost | Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 396.0 | 394.9
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Fuel hedge swap contracts |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 1.1 | 0.0
Financial instruments at FVTPL | Level 3 of fair value hierarchy | Rainy River gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 199.9 | 174.7
Financial instruments at FVTPL | Level 3 of fair value hierarchy | New Afton free cash flow interest obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 543.4 | 378.9
Financial assets at amortized cost | Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 185.5 | 200.8
Financial assets at amortized cost | Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 16.6 | 15.9
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Provisionally priced contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.6 | 2.3
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Gold and copper swap contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | (0.9) | (4.1)
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Foreign exchange forward contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 3.2 | 0.4
Financial instruments at FVTPL | Level 1 of fair value hierarchy | Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | $ 7.1 | $ 35.6

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