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Financial Instruments (Unaudited) Open Positions (Details) oz in Thousands, lb in Millions	9 Months Ended
	Sep. 30, 2016 oz lb $ / lb $ / oz
Embedded derivatives in provisional sales contracts - Copper [Member] | Derivatives not designated as hedging instruments [Member]
Derivative [Line Items]
Open positions (in lbs except gold in oz) | lb	752
Average contract price	2.15
Average market price	2.21
Maturities through	Feb. 28, 2017
Embedded derivatives in provisional sales contracts - Gold [Member] | Derivatives not designated as hedging instruments [Member]
Derivative [Line Items]
Open positions (in lbs except gold in oz) | oz	162
Average contract price | $ / oz	1,329
Average market price | $ / oz	1,328
Maturities through	Jan. 31, 2017
Embedded derivatives in provisional purchase contracts - Copper [Member] | Derivatives not designated as hedging instruments [Member]
Derivative [Line Items]
Open positions (in lbs except gold in oz) | lb	133
Average contract price	2.16
Average market price	2.20
Maturities through	Jan. 31, 2017
Fair Value Hedging [Member] | FMC's Copper Futures and Swap Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Open positions (in lbs except gold in oz) | lb	53
Average contract price	2.18
Maturities through	Apr. 30, 2018
Atlantic Copper [Member] | Copper Forward Contracts [Member] | Derivatives not designated as hedging instruments [Member]
Derivative [Line Items]
Open positions (in lbs except gold in oz) | lb	10
Average contract price	2.17
Maturities through	Nov. 30, 2016

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The average market price for a group of price risk forward or futures contracts, such as gas futures contracts.

+ References

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- Definition

The month of the latest date the derivative matures.

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

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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.

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