XML 68 R56.htm IDEA: XBRL DOCUMENT v3.21.1

Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Aug. 31, 2016	Dec. 31, 2013 USD ($)
Applicability, Impact and Conclusion of Environmental Loss Contingencies [Abstract]
Environmental contingency accrual		$ 56.4	$ 61.4
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		57.5
Brazilian subsidiary labor claims
Loss Contingencies [Line Items]
Loss Contingency Accrual		51.4
Brazilian subsidiary environmental claims
Loss Contingencies [Line Items]
Loss Contingency Accrual		4.4
Brazilian subsidiary other civil contingent liabilities and other claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		1.7
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					$ 27.5
Maximum | Brazilian subsidiary judicial and administrative proceedings
Loss Contingencies [Line Items]
Maximum potential liabilitiy		748.0
Maximum | Brazilian Non Income Tax Proceedings
Loss Contingencies [Line Items]
Maximum potential liabilitiy		331.2
Maximum | Brazilian Non Income Tax Proceedings | Indemnification Agreement Vale S.A.
Loss Contingencies [Line Items]
Maximum potential liabilitiy		154.3
Maximum | Brazilian Non Income Tax Proceedings | PIS And Cofins Cases
Loss Contingencies [Line Items]
Maximum potential liabilitiy		217.4
Maximum | Brazilian subsidiary labor claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		596.5
Maximum | Brazilian subsidiary environmental claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		17.1
Maximum | Brazilian subsidiary other civil contingent liabilities and other claims
Loss Contingencies [Line Items]
Maximum potential liabilitiy		130.9
Maximum | Brazilian subsidiary indemnification of mining rights exploration costs
Loss Contingencies [Line Items]
Maximum potential liabilitiy		3.6
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=124440162&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: