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Fair value measurement - Summary of financial assets and liabilities by category (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | $ 141.1 | $ 124.3
Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 355.0 | 530.8
Gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 174.7 | 194.0
New Afton |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 378.9 | 467.4
Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 200.8 | 481.5
Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 15.9 | 14.2
Proceeds due from income tax refunds at Mesquite |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.0 | 12.8
Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 35.6 | 59.5
Financial liabilities at amortized cost | Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 141.1 | 124.3
Financial liabilities at amortized cost | Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 394.9 | 491.0
Financial instruments at FVTPL | Level 3 of fair value hierarchy | Gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 174.7 | 194.0
Financial instruments at FVTPL | Level 3 of fair value hierarchy | New Afton |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 378.9 | 467.4
Financial assets at amortized cost | Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 200.8 | 481.5
Financial assets at amortized cost | Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 15.9 | 14.2
Financial assets at amortized cost | Level 1 of fair value hierarchy | Proceeds due from income tax refunds at Mesquite |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.0 | 12.8
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Provisionally priced contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 2.3 | 1.2
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Gold and copper swap contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | (4.1) | (1.8)
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Foreign exchange forward contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 0.4 | 1.5
Financial instruments at FVTPL | Level 1 of fair value hierarchy | Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | $ 35.6 | $ 59.5

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