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Guarantees, Commitments and Contingencies - Schedule of Estimated Undiscounted Potential Future Payments for Guarantees (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Guarantor Obligations [Line Items] |
Undiscounted exposure from guarantees | $ 140.6
Guarantees of vendor financing - short term |
Guarantor Obligations [Line Items] |
Undiscounted exposure from guarantees | 140.6
Other debt guarantees |
Guarantor Obligations [Line Items] |
Undiscounted exposure from guarantees | $ 0.0
Guarantee, term | 1 year

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- Definition Guarantee, Term + References No definition available. + Details
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Namespace Prefix: | fmc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |