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Derivative Financial Instruments and Related Hedging Programs, Realized and Unrealized Gains and Losses Table (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | $ (19.1) | $ 4.4 | $ (1.9)
Unrealized gains (losses) | 16.0 | (25.9) | (5.6)
Aluminum |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | (9.0) | 9.6 | (0.6)
Unrealized gains (losses) | 10.1 | (26.5) | 3.6
Natural Gas |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | (6.7) | (5.2) | (1.3)
Unrealized gains (losses) | 4.3 | (1.6) | (4.4)
Electricity |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Realized (losses) gains | (3.4) | 0 | 0
Unrealized gains (losses) | 0.8 | (1.8) | 0
Foreign Currency |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | 0 | 0 | 0.1
Call Options | Hedges Relating to the Convertible Notes |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | 9.0 | (2.1) | 17.0
Bifurcated Conversion Feature | Hedges Relating to the Convertible Notes |  |  |
Summary Of Realized And Unrealized Gains Losses |  |  |
Unrealized gains (losses) | $ (8.2) | $ 6.1 | $ (21.9)

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6943989&loc=d3e3602-108585 + Details
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