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Contingencies (Details)
$ in Millions
6 Months Ended
Jun. 30, 2015
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2016
Dec. 31, 2013
USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]          
Environmental contingency accrual   $ 56.1 $ 61.4    
New Wales water loss incident          
Loss Contingencies [Line Items]          
Number Of Cells With Sinkholes       1  
Number Of Cells In The Active Stack       2  
Brazilian subsidiary judicial and administrative proceedings          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   66.8      
Brazilian subsidiary labor claims          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   60.0      
Brazilian subsidiary environmental claims          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   4.9      
Brazilian subsidiary other civil contingent liabilities and other claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   1.9      
Uberaba gypstacks settled litigation          
Loss Contingencies [Line Items]          
Loss Contingency, Damages Awarded, Value $ 0.3        
Uberaba EHS Class Action pending litigation          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy         $ 29.9
Maximum | Brazilian subsidiary judicial and administrative proceedings          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   798.0      
Maximum | Brazilian Non Income Tax Proceedings          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   371.9      
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A.          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   177.3      
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   235.0      
Maximum | Brazilian subsidiary labor claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   626.5      
Maximum | Brazilian subsidiary environmental claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   19.1      
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   148.1      
Maximum | Brazilian subsidiary indemnification of mining rights exploration costs          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   4.2      
Minimum | New Wales water loss incident          
Loss Contingencies [Line Items]          
Financial assurance to support off-site monitoring and sinkhole remediation costs   $ 40.0