XML 60 R47.htm IDEA: XBRL DOCUMENT v3.5.0.2
Contingencies (Details)
$ in Millions
3 Months Ended
Aug. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
waste
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]        
Environmental contingency accrual   $ 78.0   $ 25.6
Loss Contingencies [Line Items]        
Number of specified mineral processing wastes exempted from EPA rules | waste   20    
Amount deposited by Mosaic into the RCRA Trusts $ 630.0      
New Wales water loss incident        
Loss Contingencies [Line Items]        
Consent Order public review period   21 days    
2015 Consent Decrees With EPA | Unfavorable Regulatory Action        
Loss Contingencies [Line Items]        
Penalty accrued related to EPA RCRA Initiative 8.0      
Payment related to loss contingency liability 1.0      
Future capital expenditures 200.0      
Asset retirement obligations, undiscounted       1,700.0
Discounted asset retirement obligation       $ 535.0
Amount deposited by Mosaic into the RCRA Trusts 630.0      
Maximum | Brazilian Non Income Tax Proceedings        
Loss Contingencies [Line Items]        
Maximum potential liabilitiy   $ 101.0    
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases        
Loss Contingencies [Line Items]        
Maximum potential liabilitiy   72.0    
Maximum | 2015 Consent Decrees With EPA | Unfavorable Regulatory Action        
Loss Contingencies [Line Items]        
Maximum potential liabilitiy $ 2.2      
Minimum | New Wales water loss incident        
Loss Contingencies [Line Items]        
Financial assurance to support off-site monitoring and sinkhole remediation costs   40.0    
Minimum | New Wales water loss incident | Sinkhole closure remediation plan        
Loss Contingencies [Line Items]        
Expense related to environmental remediation   56.0    
Minimum | New Wales water loss incident | Obligations other than sinkhole closure        
Loss Contingencies [Line Items]        
Expense related to environmental remediation   $ 4.0    
Estimate | 2015 Consent Decrees With EPA | Unfavorable Regulatory Action        
Loss Contingencies [Line Items]        
Letter of credit to be issued to support financial assurance obligations under the Florida Consent Decree     $ 50.0