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Financial Instruments - Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets $ 7,202.7 $ 7,213.1
Liabilities (2,486.1) (2,440.6)
Assets (liabilities) 4,716.6 4,772.5
Level 1 | Recurring fair value measurement    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets (liabilities) 24.5 41.3
Level 1 | Recurring fair value measurement | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Liabilities 0.0 0.0
Level 1 | Recurring fair value measurement | Investments    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 24.5 41.3
Level 1 | Recurring fair value measurement | Trade receivables from provisional concentrate sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 1 | Recurring fair value measurement | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 1 | Recurring fair value measurement | Contingent consideration    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 2 | Recurring fair value measurement    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets (liabilities) 18.4 24.3
Level 2 | Recurring fair value measurement | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Liabilities (12.8) (0.1)
Level 2 | Recurring fair value measurement | Investments    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 2 | Recurring fair value measurement | Trade receivables from provisional concentrate sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 31.2 17.5
Level 2 | Recurring fair value measurement | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 6.9
Level 2 | Recurring fair value measurement | Contingent consideration    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 3 | Recurring fair value measurement    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets (liabilities) 36.8 0.0
Level 3 | Recurring fair value measurement | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Liabilities 0.0 0.0
Level 3 | Recurring fair value measurement | Investments    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 3 | Recurring fair value measurement | Trade receivables from provisional concentrate sales    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 3 | Recurring fair value measurement | Derivatives    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets 0.0 0.0
Level 3 | Recurring fair value measurement | Contingent consideration    
Disclosure of Financial Assets and Liabilities [Line Items]    
Assets $ 36.8 $ 0.0