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Pension Plans and Other Benefits - Defined Contribution Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan [Abstract] |  |  |
Mosaic's matching rate of first tier of employee's compensation deferrals under the "Investment Plan" | 100.00% |  |
Maximum rate of first tier of deferred compensation elected by employees under the Company's "Investment Plan" | 3.00% |  |
Mosaic's matching rate of second tier of employee's compensation deferrals under the "Investment Plan" | 50.00% |  |
Maximum rate of second tier of deferred compensation elected by employees under the Company's "Investment Plan" | 3.00% |  |
Expense attributable to the Company's Investment Plan and Savings Plan | $ 51.2 | $ 54.3 | $ 51.1

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- Definition The first tier maximum percentage of eligible compensation that an employee may elect to be treated as deferred compensation under the entity's defined contribution plan. + References No definition available. + Details
Name: | mos_EmployeeDeferredCompensationRateFirstTier
Namespace Prefix: | mos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The second tier maximum percentage of eligible compensation that an employee may elect to be treated as deferred compensation under the entity's defined contribution plan. + References No definition available. + Details
Name: | mos_EmployeeDeferredCompensationRateSecondTier
Namespace Prefix: | mos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The rate at which the entity matches employee first tier deferred compensation under the entity's defined contribution plan. + References No definition available. + Details
Name: | mos_EmployerMatchingRateOfEmployeeDeferredCompensationInFirstTier
Namespace Prefix: | mos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The rate at which the entity matches employee second tier deferred compensation under the entity's defined contribution plan. + References No definition available. + Details
Name: | mos_EmployerMatchingRateOfEmployeeDeferredCompensationInSecondTier
Namespace Prefix: | mos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration