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Financial Instruments (Unaudited) Open Positions (Details) oz in Thousands, lb in Millions | 6 Months Ended
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Jun. 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 | 769
Average contract price | 2.16
Average market price | 2.20
Maturities through | Nov. 30, 2016
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 | 90
Average contract price | $ / oz | 1,259
Average market price | $ / oz | 1,322
Maturities through | Oct. 31, 2016
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 | 123
Average contract price | 2.17
Average market price | 2.20
Maturities through | Oct. 31, 2016
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 | 62
Average contract price | 2.18
Maturities through | Mar. 31, 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 | 14
Average contract price | 2.10
Maturities through | Aug. 31, 2016

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