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Guarantees, Commitments, and Contingencies, Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	9 Months Ended
	Jun. 30, 2004 United States Antitrust Law [Member] resident	Sep. 30, 2012 Canada Antitrust Law [Member] producer
Loss Contingencies [Line Items]
Number of hydrogen peroxide producers in putative direct and indirect purchaser class action complaints filed in February 2005		5
Settlement amount, settled by other defandants		$ 20.6
Loss Contingency, Number Of Plaintiffs	13

X

- Definition

Litigation Settlement Amount, Settled by Other Defandants

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No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of Hydrogen Peroxide Producers in Putative Class Action Complaints

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No definition available.

+ Details

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Namespace Prefix:	fmc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

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No definition available.

+ Details

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration