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Financial Instruments - Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Financial Assets and Liabilities [Line Items]    
Derivative assets $ 6.9 $ 2.9
Financial assets 575.4 394.1
Level 1    
Disclosure of Financial Assets and Liabilities [Line Items]    
Derivative assets 0.0 0.0
Derivative liabilities 0.0 0.0
Financial assets 41.3 156.5
Level 2    
Disclosure of Financial Assets and Liabilities [Line Items]    
Derivative assets 6.9 2.9
Derivative liabilities (0.1) (1.8)
Financial assets 24.3 29.8
Investments | Level 1    
Disclosure of Financial Assets and Liabilities [Line Items]    
Fair Value 41.3 35.3
Investments | Level 2    
Disclosure of Financial Assets and Liabilities [Line Items]    
Fair Value 0.0 0.0
Long-term investments | Level 1    
Disclosure of Financial Assets and Liabilities [Line Items]    
Fair Value 0.0 121.2
Long-term investments | Level 2    
Disclosure of Financial Assets and Liabilities [Line Items]    
Fair Value 0.0 0.0
Trade receivables from provisional concentrates sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 17.5 28.7
Trade receivables from provisional concentrates sales | Level 1    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0.0 0.0
Trade receivables from provisional concentrates sales | Level 2    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets $ 17.5 $ 28.7