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Contingencies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2014
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2016
Dec. 31, 2013
USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]          
Environmental contingency accrual   $ 28.6 $ 39.3    
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   59.6      
Brazilian subsidiary labor claims          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   52.5      
Brazilian subsidiary Potash Mine occupational hazard          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   2.1      
Brazilian subsidiary environmental claims          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   3.9      
Brazilian subsidiary other civil contingent liabilities and other claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   3.9      
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         $ 27.0
Tapira Overtime Pay Matter          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   3.5      
Sergipe Overime Pay Matter          
Loss Contingencies [Line Items]          
Loss Contingency Accrual   3.8      
Maximum | Brazilian subsidiary judicial and administrative proceedings          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   835.0      
Maximum | Brazilian Non Income Tax Proceedings          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   333.4      
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A.          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   156.8      
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   227.0      
Maximum | Brazilian subsidiary labor claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   582.9      
Maximum | Brazilian subsidiary environmental claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   110.0      
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   138.7      
Maximum | Brazilian subsidiary indemnification of mining rights exploration costs          
Loss Contingencies [Line Items]          
Maximum potential liabilitiy   3.4      
Minimum | New Wales water loss incident          
Loss Contingencies [Line Items]          
Financial assurance to support off-site monitoring and sinkhole remediation costs   $ 40.0