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Long-term debt - Financial Covenants (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | $ 1,153.3
Borrowings | 100.0
Repayments/Extinguishments | (798.8)
Fair Value changes | 142.8
Interest & Accretion | 31.0
Liabilities arising from financing activities at end of period | 628.3
Long-term debt |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 396.0
Borrowings | 0.0
Repayments/Extinguishments | 0.0
Fair Value changes | 0.0
Interest & Accretion | 1.0
Liabilities arising from financing activities at end of period | 397.0
Interest payable |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 14.1
Borrowings | 0.0
Repayments/Extinguishments | (30.0)
Fair Value changes | 0.0
Interest & Accretion | 30.0
Liabilities arising from financing activities at end of period | 14.1
Rainy River gold stream obligation |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 199.9
Borrowings | 0.0
Repayments/Extinguishments | (34.2)
Fair Value changes | 51.6
Interest & Accretion | 0.0
Liabilities arising from financing activities at end of period | 217.3
New Afton free cash flow interest obligation |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 543.4
Borrowings | 0.0
Repayments/Extinguishments | (634.6)
Fair Value changes | 91.2
Interest & Accretion | 0.0
Liabilities arising from financing activities at end of period | 0.0
Credit facility |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 0.0
Borrowings | 100.0
Repayments/Extinguishments | (100.0)
Fair Value changes | 0.0
Interest & Accretion | 0.0
Liabilities arising from financing activities at end of period | $ 0.0

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