XML 68 R56.htm IDEA: XBRL DOCUMENT
v3.20.2

Contingencies (Details) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 31, 2016 | Dec. 31, 2013 USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract] |  |  |  |  |
Environmental contingency accrual |  | $ 58.5 | $ 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 |  | 61.0 |  |  |
Brazilian subsidiary labor claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency Accrual |  | 54.9 |  |  |
Brazilian subsidiary environmental claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency Accrual |  | 4.2 |  |  |
Brazilian subsidiary other civil contingent liabilities and other claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 1.9 |  |  |
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 |  |  |  |  | $ 26.7
Maximum | Brazilian subsidiary judicial and administrative proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 830.0 |  |  |
Maximum | Brazilian Non Income Tax Proceedings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 322.7 |  |  |
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A. |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 153.7 |  |  |
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 214.0 |  |  |
Maximum | Brazilian subsidiary labor claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 578.7 |  |  |
Maximum | Brazilian subsidiary environmental claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 108.9 |  |  |
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum potential liabilitiy |  | 138.8 |  |  |
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 |  |  |

X
- Definition Financial assurance obligation required to support remediation costs through, but not limited to, a financial strength test or a parent guarantee. + References No definition available. + Details
Name: | mos_FinancialAssuranceToSupportRemediationCosts
Namespace Prefix: | mos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Total Number Of Cells In The Active Phosphogypsum Stack + References No definition available. + Details
Name: | mos_NumberOfCellsInTheActiveStack
Namespace Prefix: | mos_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of cells of the active phosphogypsum stack with sinkholes underneath. + References No definition available. + Details
Name: | mos_NumberOfCellsWithSinkholes
Namespace Prefix: | mos_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingencies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ApplicabilityImpactAndConclusionOfEnvironmentalLossContingenciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyDamagesAwardedValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12021-110248 + Details
Name: | us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_EnvironmentalRemediationSiteAxis=mos_WaterLossIncidentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_BraziliansubsidiaryjudicialandadministrativeproceedingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_BraziliansubsidiarylaborclaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_BraziliansubsidiaryenvironmentalclaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_BraziliansubsidiaryothercivilcontingentliabilitiesandotherclaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_UberabagypstackssettledlitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_UberabaEHSClassActionpendinglitigationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_BrazilianNonIncomeTaxProceedingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_IndemnificationGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=mos_PISAndCofinsCasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=mos_BraziliansubsidiaryindemnificationofminingrightsexplorationcostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |