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Pension Plans and Other Benefits - Defined Contribution Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [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	$ 55.8	$ 48.0	$ 56.4

X

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration