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Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains (Losses) Table (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) |  |  | $ (6.0) | $ 4.9
Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | $ (1.5) | $ 2.0 | (6.0) | 4.9
Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | (8.8) | 1.3 | (13.5) | 3.3
Unrealized gains (losses) | (1.5) | 1.5 | (6.0) | 3.5
Foreign Currency Member | Operational Risk Hedges | Designated as Hedging Instrument [Member] |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | (0.2) | 0.0 | (0.2) | 0.0
Foreign Currency Member | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | 0.0 | (0.1) | 0.0 | (0.1)
Aluminum | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | (7.1) | 1.3 | (9.8) | 2.1
Unrealized gains (losses) | (4.3) | 0.6 | (8.5) | 2.3
Natural Gas | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | (1.3) | 0.5 | (2.6) | 1.2
Unrealized gains (losses) | 1.5 | (0.2) | 0.8 | 0.6
Electricity | Operational Risk Hedges | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Realized (losses) gains | (0.4) | (0.5) | (1.1) | 0.0
Unrealized gains (losses) | 1.3 | 1.2 | 1.7 | 0.7
Hedges Relating To Notes Member | Call Options | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | 0.0 | 2.5 | 10.2 | 6.9
Hedges Relating To Notes Member | Bifurcated Conversion Feature | Not Designated as Hedging Instrument |  |  |  |
Summary Of Realized And Unrealized Gains (Losses) |  |  |  |
Unrealized gains (losses) | $ 0.0 | $ (2.0) | $ (10.2) | $ (5.5)

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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=56946850&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=56946850&loc=SL5624171-113959 + Details
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