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Contingencies (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Applicability, Impact and Conclusion of Environmental Loss Contingencies    
Environmental contingency accrual $ 197.5 $ 203.2
Loss Contingencies [Line Items]    
Environmental contingency accrual $ 197.5 203.2
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Accrued liabilities  
Accrued Environmental Loss Contingencies, Current $ 90.8 148.9
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] Accrued liabilities  
Accrued Environmental Loss Contingencies, Noncurrent $ 106.7 $ 54.3
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] Other noncurrent liabilities  
New Wales Phase II East Stack    
Loss Contingencies [Line Items]    
Estimated loss contingency $ 14.7  
Maximum funding of environmental projects 14.7  
New Wales Phase II West Stack    
Loss Contingencies [Line Items]    
Estimated loss contingency 81.5  
Maximum funding of environmental projects 81.5  
Brazilian subsidiary judicial and administrative proceedings    
Loss Contingencies [Line Items]    
Estimated loss contingency 79.3  
Maximum funding of environmental projects 79.3  
Brazilian subsidiary labor claims    
Loss Contingencies [Line Items]    
Loss Contingency Accrual 62.0  
Maximum | Brazilian subsidiary judicial and administrative proceedings    
Loss Contingencies [Line Items]    
Estimated loss contingency 559.2  
Maximum funding of environmental projects 559.2  
Maximum | Brazilian Non Income Tax Proceedings    
Loss Contingencies [Line Items]    
Estimated loss contingency 601.8  
Maximum funding of environmental projects 601.8  
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement    
Loss Contingencies [Line Items]    
Estimated loss contingency 204.0  
Maximum funding of environmental projects 204.0  
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins cases    
Loss Contingencies [Line Items]    
Estimated loss contingency 311.9  
Maximum funding of environmental projects 311.9  
Maximum | Brazilian subsidiary labor claims    
Loss Contingencies [Line Items]    
Estimated loss contingency 377.1  
Maximum funding of environmental projects $ 377.1