Total Investments EBP, Investment, Fair Value Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Subsequent Event Subsequent Event [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Total deductions EBP, Change in Net Asset Available for Benefit, Decrease Note receivable from participant, account, maximum borrowing, amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] Note receivable from participant, account, minimum borrowing, amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Minimum annual contribution to eligible compensation, percentage EBP, Participant Contribution, Minimum Annual Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Minimum Annual Contribution to Eligible Compensation, Percentage Secure 2.0 act, required minimum distribution age EBP, Secure 2.0 Act, Required Minimum Distribution Age EBP, Secure 2.0 Act, Required Minimum Distribution Age Subsequent Event Type [Domain] Subsequent Event Type [Domain] Money market fund Money Market Funds [Member] Plan Interest EBP, Nonconsolidated, Plan Interest in Master Trust [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Terminated plans, transfer of surplus EBP, Terminated Plans, Transfer Of Surplus EBP, Terminated Plans, Transfer Of Surplus Employment termination, benefit payout IRS maximum EBP, Employment Termination, Benefit Payout IRS Maximum EBP, Employment Termination, Benefit Payout IRS Maximum EBP, Investment, Fair Value and NAV [Abstract] Total assets EBP, Asset Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to net assets attributed to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Payment of Benefits EBP, Payment to Participant [Policy Text Block] Net transfers from qualified plans EBP, Change in Net Asset Available for Benefit, Transfer to (from) Plan EBP, Master Trust [Line Items] EBP, Master Trust [Line Items] Amendment Flag Amendment Flag Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Secure 2.0 act, decrease in excise tax, percent EBP, Secure 2.0 Act, Decrease In Excise Tax, Percent EBP, Secure 2.0 Act, Decrease In Excise Tax, Percent EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] EBP, Contribution, Participating Employer [Domain] EBP, Contribution, Participating Employer [Domain] Scenario [Domain] Scenario [Domain] Investments [Domain] Investments [Domain] EBP, Master Trust [Abstract] Use of Estimates EBP, Use of Estimate [Policy Text Block] Schedule H, Line 4i – Schedule of Assets (Held At End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] EBP, Contribution, Participating Employer [Axis] EBP, Contribution, Participating Employer [Axis] Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] EBP, Plan Name [Axis] EBP, Plan Name [Axis] EBP, Plan Name Interest income from participant loans EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Employment termination, benefit payout IRS maximum age EBP, Employment Termination, Benefit Payout IRS Maximum, Age EBP, Employment Termination, Benefit Payout IRS Maximum, Age Mosaic Master Trust Plan's interest in the Master Trust investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Discretionary Contributions Discretionary Contributions [Member] Discretionary Contributions Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of the Plan EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Domain] Mosaic Company common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Contributions, Tranche Two Contributions, Tranche Two [Member] Contributions, Tranche Two Total additions EBP, Change in Net Asset Available for Benefit, Increase Secure 2.0 act, catch-up contributions EBP, Secure 2.0 Act, Catch-Up Contributions EBP, Secure 2.0 Act, Catch-Up Contributions Plan’s interest in net investment income of the EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Defined Contribution Plan Contributions Funded by Defined Benefit Surplus EBP, Defined Contribution Plan Contributions Funded by Defined Benefit Surplus EBP, Defined Contribution Plan Contributions Funded by Defined Benefit Surplus Note receivable from participant, general loan, minimum borrowing term EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term EBP, Note Receivable From Participant, General Loan, Minimum Borrowing Term Investment, Identifier [Axis] Investment, Identifier [Axis] Administrative fees EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Asset held for investment EBP, Asset Held for Investment Employer contribution maximum vesting age EBP, Employer Contribution Maximum Vesting Age EBP, Employer Contribution Maximum Vesting Age Contributions [Domain] Contributions [Domain] Contributions [Domain] EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage Document Information [Line Items] Document Information [Line Items] Interest bearing cash Interest-Bearing Deposits [Member] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Interest in Master Trust EBP, Master Trust [Text Block] Scenario [Axis] Scenario [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Level 2 Fair Value, Inputs, Level 2 [Member] Secure 2.0 act, administrative transition period EBP, Secure 2.0 Act, Administrative Transition Period EBP, Secure 2.0 Act, Administrative Transition Period Mosaic Investment Plan Mosaic Investment Plan [Member] Mosaic Investment Plan Subsequent Event Type [Axis] Subsequent Event Type [Axis] Contributions [Axis] Contributions [Axis] Contributions EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Total receivables EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Automatic, deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Benefits paid EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Total investments at fair value EBP, Investment, Plan Interest in Master Trust, Fair Value Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Mosaic Union Savings Plan Mosaic Union Savings Plan [Member] Mosaic Union Savings Plan Assets: Assets [Abstract] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] Employer contribution vesting service period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. EBP, Tax Status [Abstract] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Change in Plan Interest in Master Trust EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Change in Plan Interest in Master Trust Administrative Expenses EBP, Expense [Policy Text Block] Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP, Master Trust [Table] EBP, Master Trust [Table] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] EBP 019 EBP 019 [Member] EBP 019 Document Type Document Type Entity Central Index Key Entity Central Index Key EBP 004 [Member] EBP 004 [Member] EBP 004 Contributions, Tranche One [Member] Contributions, Tranche One [Member] Contributions, Tranche One Asset held for investment, participant loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Common collective trust funds Common/collective trust funds Common Collective Trust [Member] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] EBP, Subsequent Event [Table] EBP, Subsequent Event [Table] Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Master Trust EBP, Nonconsolidated, Master Trust [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Schedule of Master Trust Net Assets EBP, Master Trust [Table Text Block] Concentration of investment at fair value to net assets, percentage EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage EBP, Subsequent Event [Abstract] Subsequent Events EBP, Subsequent Event [Text Block] Forecast Forecast [Member] Income Tax Status EBP, Tax Status [Text Block] Note receivable from participant, general loan, maximum borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Note receivable from participant, account, maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Subsequent Event [Line Items] EBP, Subsequent Event [Line Items] Document Information [Table] Document Information [Table] EBP, Plan Name [Domain] EBP, Plan Name [Domain] EBP, Plan Name [Domain] Note Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Safe Harbor Contributions Safe Harbor Contributions [Member] Safe Harbor Contributions Net investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Nonconsolidated, Master Trust and Plan Interest in Master Trust [Axis] EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Level 3 Fair Value, Inputs, Level 3 [Member] Net assets available for benefits Beginning of year End of year Net assets available for benefits EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage Non-Elective Contributions Non-Elective Contributions [Member] Non-Elective Contributions EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] Interest in master trust, percentage EBP, Interest in Master Trust, Percentage EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]