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Financial Instruments - Financial Assets and Liabilities by Category (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets $ 575.4 $ 394.1
Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0.1 1.8
Debt    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 703.7 193.7
Cash and cash equivalents    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 399.6 107.0
Trade receivables from provisional concentrates sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 17.5 28.7
Receivable not arising from sale of metal concentrates    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 110.1 99.0
Investments | Equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 41.3 35.3
Investments | Other than equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   121.2
Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 6.9 2.9
Amortized cost | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0.0 0.0
Amortized cost | Debt    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 703.7 193.7
FVTPL | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0.1 1.8
FVTPL | Debt    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0.0 0.0
FVTOCI | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0.0 0.0
FVTOCI | Debt    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0.0 0.0
Amortized cost    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 509.7 206.0
Amortized cost | Cash and cash equivalents    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 399.6 107.0
Amortized cost | Trade receivables from provisional concentrates sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
Amortized cost | Receivable not arising from sale of metal concentrates    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 110.1 99.0
Amortized cost | Investments | Equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
Amortized cost | Investments | Other than equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   0.0
Amortized cost | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
FVTPL    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 62.5 66.9
FVTPL | Cash and cash equivalents    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
FVTPL | Trade receivables from provisional concentrates sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 17.5 28.7
FVTPL | Receivable not arising from sale of metal concentrates    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
FVTPL | Investments | Equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 38.1 35.3
FVTPL | Investments | Other than equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   0.0
FVTPL | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 6.9 2.9
FVTOCI    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 3.2 121.2
FVTOCI | Cash and cash equivalents    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
FVTOCI | Trade receivables from provisional concentrates sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
FVTOCI | Receivable not arising from sale of metal concentrates    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
FVTOCI | Investments | Equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 3.2 0.0
FVTOCI | Investments | Other than equity securities    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   121.2
FVTOCI | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets $ 0.0 $ 0.0