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Long-term debt - Financial Covenants (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | $ 1,167.3
Borrowings | 0.0
Repayments | (169.6)
Fair Value changes | (71.4)
Interest & Accretion | 36.3
Liabilities arising from financing activities at end of period | 962.6
Long-term debt |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 491.0
Borrowings | 0.0
Repayments | (100.0)
Fair Value changes | 0.0
Interest & Accretion | 3.9
Liabilities arising from financing activities at end of period | 394.9
Interest payable |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 14.9
Borrowings | 0.0
Repayments | (33.2)
Fair Value changes | 0.0
Interest & Accretion | 32.4
Liabilities arising from financing activities at end of period | 14.1
Gold stream obligation |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 194.0
Borrowings | 0.0
Repayments | (24.0)
Fair Value changes | 4.7
Interest & Accretion | 0.0
Liabilities arising from financing activities at end of period | 174.7
Free Cash Flow Interest Obligation, New Afton |
Long Term Debt [Line Items] |
Liabilities arising from financing activities at beginning of period | 467.4
Borrowings | 0.0
Repayments | (12.4)
Fair Value changes | (76.1)
Interest & Accretion | 0.0
Liabilities arising from financing activities at end of period | $ 378.9

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