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Financial Instruments (Unaudited) Open Positions (Details) oz in Thousands, lb in Millions | 3 Months Ended
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Mar. 31, 2016 lb oz $ / 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 | 776
Average contract price | 2.14
Average market price | 2.20
Maturities through | Sep. 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 | 89
Average contract price | $ / oz | 1,224
Average market price | $ / oz | 1,236
Maturities through | Jun. 30, 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 | 156
Average contract price | 2.17
Average market price | 2.20
Maturities through | Jul. 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 | 69
Average contract price | 2.23
Maturities through | Mar. 31, 2018
Atlantic Copper [Member] | Forward Contracts [Member] | Derivatives not designated as hedging instruments [Member] |
Derivative [Line Items] |
Open positions (in lbs except gold in oz) | lb | 47
Average contract price | 2.24
Maturities through | May 31, 2016

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