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Derivatives, Hedging Programs and Other Financial Instruments, Realized and Unrealized Gains (Losses) Table (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized loss (gain) |  |  | $ (14.0) | $ (16.9)
Cost of Sales | Aluminum | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (gain) loss | $ (4.0) | $ 0.4 | (13.8) | 4.1
Cost of Sales | Natural Gas | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (gain) loss | 0.2 | 0.9 | 0.3 | 4.2
Cost of Sales | Alloy Metal Hedge | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (gain) loss | (0.3) | 0.0 | (0.2) | 0.0
Cost of Sales | Foreign Exchange Contract | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (gain) loss | (0.1) | 0.0 | (0.1) | 0.0
Cost of Sales | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (gain) loss | (4.2) | 1.3 | (13.8) | 8.3
Gain (Loss) on Derivative Instruments | Aluminum | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized loss (gain) | (10.6) | (1.7) | (15.3) | (11.7)
Gain (Loss) on Derivative Instruments | Natural Gas | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized loss (gain) | (0.2) | (0.3) | 1.3 | (5.2)
Gain (Loss) on Derivative Instruments | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized loss (gain) | $ (10.8) | $ (2.0) | $ (14.0) | $ (16.9)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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