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Contingencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Oct. 24, 2016
Applicability, Impact and Conclusion of Environmental Loss Contingencies        
Environmental contingency accrual   $ 61.4 $ 39.3  
Brazilian subsidiary judicial and administrative proceedings        
Loss Contingencies [Line Items]        
Estimated loss contingency   61.3    
Brazilian subsidiary labor claims        
Loss Contingencies [Line Items]        
Loss Contingency Accrual   54.4    
Brazilian subsidiary other civil contingent liabilities and other claims        
Loss Contingencies [Line Items]        
Estimated loss contingency   2.2    
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]        
Estimated loss contingency   29.0    
Maximum | Brazilian subsidiary judicial and administrative proceedings        
Loss Contingencies [Line Items]        
Estimated loss contingency   800.2    
Maximum | Brazilian Non Income Tax Proceedings        
Loss Contingencies [Line Items]        
Estimated loss contingency   354.8    
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement        
Loss Contingencies [Line Items]        
Estimated loss contingency   165.0    
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins cases        
Loss Contingencies [Line Items]        
Estimated loss contingency   234.2    
Maximum | Brazilian subsidiary labor claims        
Loss Contingencies [Line Items]        
Estimated loss contingency   624.8    
Maximum | Brazilian subsidiary environmental claims        
Loss Contingencies [Line Items]        
Estimated loss contingency   18.3    
Loss Contingency Accrual   4.8    
Maximum | Brazilian subsidiary mining claims        
Loss Contingencies [Line Items]        
Estimated loss contingency   3.8    
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims        
Loss Contingencies [Line Items]        
Estimated loss contingency   $ 153.2    
Minimum | Water loss incident        
Loss Contingencies [Line Items]        
Financial assurance to support off-site monitoring and sinkhole remediation costs       $ 40.0