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Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains (Losses) Table (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) |  |  | $ 3.6 | $ (2.3)
Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | 3.1 | (2.3) | 6.4 | (4.8)
Unrealized gains (losses) | (1.3) | 3.1 | 3.6 | (2.3)
Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | (3.5) | 1.5 | 0 | (3.4)
Call Options | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | 12.9 | 31.0 | 19.8 | 27.9
Bifurcated Conversion Feature | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | (10.7) | (29.4) | (16.2) | (26.8)
Aluminum | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | 3.1 | (2.0) | 5.2 | (3.6)
Aluminum | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | (1.0) | 1.7 | 1.3 | (4.5)
Natural Gas | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | (0.1) | (0.5) | 1.1 | (1.3)
Natural Gas | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | (1.6) | 0 | (1.0) | 0.8
Electricity | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | 0.1 | 0.3 | 0.1 | 0.2
Electricity | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | (1.0) | (0.3) | (0.3) | 0.3
Foreign Currency | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | 0 | (0.1) | 0 | (0.1)
Foreign Currency | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | $ 0.1 | $ 0.1 | $ 0 | $ 0

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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=7476318&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=7476318&loc=SL5624171-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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