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Contingencies (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]    
Environmental contingency accrual $ 262.7 $ 203.2
New Wales Phase II East Stack    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 24.8  
New Wales Phase II West Stack    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 119.4  
Brazilian subsidiary judicial and administrative proceedings    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 77.2  
Brazilian subsidiary labor claims    
Loss Contingencies [Line Items]    
Loss Contingency Accrual 65.7  
Maximum | Brazilian subsidiary judicial and administrative proceedings    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 709.9  
Maximum | Brazilian Non Income Tax Proceedings    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 605.9  
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A.    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 166.0  
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy 375.8  
Maximum | Brazilian subsidiary labor claims    
Loss Contingencies [Line Items]    
Maximum potential liabilitiy $ 499.2