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Contingencies (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]    
Environmental contingency accrual $ 225.7 $ 203.2
New Wales Phase II East Stack    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 20.1  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 20.1  
New Wales Phase II West Stack    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 99.6  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 99.6  
Brazilian subsidiary judicial and administrative proceedings    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 91.3  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 91.3  
Brazilian subsidiary labor claims    
Loss Contingency [Abstract]    
Loss Contingency Accrual 71.9  
Loss Contingencies [Line Items]    
Loss Contingency Accrual 71.9  
Maximum | Brazilian subsidiary judicial and administrative proceedings    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 641.4  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 641.4  
Maximum | Brazilian Non Income Tax Proceedings    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 672.3  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 672.3  
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A.    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 229.2  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 229.2  
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 352.7  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 352.7  
Maximum | Brazilian subsidiary labor claims    
Loss Contingency [Abstract]    
Maximum potential liabilitiy 439.8  
Loss Contingencies [Line Items]    
Maximum potential liabilitiy $ 439.8