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Contingencies (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2014
Oct. 24, 2016
Applicability, Impact and Conclusion of Environmental Loss Contingencies            
Environmental contingency accrual $ 35.1     $ 58.6    
Water loss incident | Sinkhole closure remediation plan            
Loss Contingencies [Line Items]            
Expense related to environmental remediation   $ 14.0   79.5    
Brazilian subsidiary judicial and administrative proceedings [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       47.9    
Brazilian subsidiary labor claims [Member]            
Loss Contingencies [Line Items]            
Loss Contingency Accrual       40.7    
Brazilian subsidiary Potash Mine occupational hazard [Member]            
Loss Contingencies [Line Items]            
Loss Contingency Accrual       6.7    
Brazilian subsidiary environmental claims [Member]            
Loss Contingencies [Line Items]            
Loss Contingency Accrual       5.6    
Brazilian subsidiary other civil contingent liabilities and other claims [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       1.6    
Uberaba gypstacks settled litigation [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Damages Awarded, Value         $ 0.3  
Uberaba EHS Class Action pending litigation [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       31.8    
Maximum | Brazilian subsidiary judicial and administrative proceedings [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       1,080.0    
Maximum | Brazilian Non Income Tax Proceedings            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       414.0    
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       228.0    
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins cases            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       256.0    
Maximum | Brazilian subsidiary labor claims [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       743.7    
Maximum | Brazilian subsidiary environmental claims [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       163.3    
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims [Member]            
Loss Contingencies [Line Items]            
Maximum funding of environmental projects       $ 172.7    
Minimum | Water loss incident            
Loss Contingencies [Line Items]            
Financial assurance to support off-site monitoring and sinkhole remediation costs           $ 40.0
Minimum | Water loss incident | Sinkhole closure remediation plan            
Loss Contingencies [Line Items]            
Expense related to environmental remediation $ 1.5   $ 70.0