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Subsequent Events (Details) - Isagro - Subsequent Event - USD ($) $ in Millions		3 Months Ended
	Oct. 02, 2020	Dec. 31, 2020
Subsequent Event [Line Items]
Purchase price	$ 65
Forecast
Subsequent Event [Line Items]
Asset acquisition expense		$ 65

X

- Definition

Asset Acquisition, Consideration Transferred

+ References

No definition available.

+ Details

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Namespace Prefix:	fmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Asset Acquisition, Research And Development Expense

+ References

No definition available.

+ Details

Name:	fmc_AssetAcquisitionResearchAndDevelopmentExpense
Namespace Prefix:	fmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	fmc_AssetAcquisitionAxis=fmc_IsagroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: