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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 |  |  |

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