XML 118 R96.htm IDEA: XBRL DOCUMENT
v3.20.4

Asset Retirement Obligations Other Commitments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 27, 2018
--- | --- | --- | --- | ---
Other Commitments [Line Items] |  |  |  |
Assets held-in-trust, current | $ 1,393.9 | $ 1,315.2 | $ 1,160.1 |
Asset retirement obligations | 1,203.7 | 1,160.8 |  |
Bonnie Facility Trust |  |  |  |
Other Commitments [Line Items] |  |  |  |
Asset retirement obligations |  |  |  | $ 21.0
Plant City and Bonnie Facilities [Member] |  |  |  |
Other Commitments [Line Items] |  |  |  |
Surety Bonds Outstanding Delivered To EPA | 243.2 |  |  |
Asset retirement obligations | $ 251.8 | $ 211.2 |  |

X
- Definition The face amount of surety bonds provided by the entity as of the balance sheet date, which were issued to provide assurance to EPA in connection with mining reclamation obligations. + References No definition available. + Details
Name: | mos_SuretyBondsOutstandingDeliveredToEPA
Namespace Prefix: | mos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=mos_BonnieFacilityTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=mos_PlantCityandBonnieFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |