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Fair value measurement - Summary of financial assets and liabilities by category (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | $ 124.3 | $ 115.7
Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 530.8 | 548.0
Gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 194.0 | 217.9
New Afton |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 467.4 | 436.1
Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 481.5 | 186.3
Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 14.2 | 65.2
Proceeds due from income tax refunds at Mesquite |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 12.8 | 12.8
Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 59.5 | 46.2
Financial liabilities at amortized cost | Trade and other payables |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 124.3 | 115.7
Financial liabilities at amortized cost | Long-term debt |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 491.0 | 489.2
Financial instruments at FVTPL | Level 3 of fair value hierarchy | Gold stream obligation |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 194.0 | 217.9
Financial instruments at FVTPL | Level 3 of fair value hierarchy | New Afton |  |
FINANCIAL LIABILITIES |  |
Financial liabilities, at fair value | 467.4 | 436.1
Financial assets at amortized cost | Cash and cash equivalents |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 481.5 | 186.3
Financial assets at amortized cost | Trade and other receivables |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 14.2 | 65.2
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 | 12.8 | 12.8
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Provisionally priced contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 1.2 | 8.9
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Gold and copper swap contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | (1.8) | (9.8)
Financial instruments at FVTPL | Level 2 of fair value hierarchy | Foreign exchange forward contracts |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | 1.5 | 0.0
Financial instruments at FVTPL | Level 1 of fair value hierarchy | Investments |  |
FINANCIAL ASSETS |  |
Financial assets, at fair value | $ 59.5 | $ 46.2

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