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Segment and Geographical Area Information, Textuals (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
Increase in Fabricated Products segment operating income relating to primary aluminum hedging activities |  | $ 3.3 |
Increase in Fabricated Products segment asset related to primary aluminum hedging activities |  |  | 0.6
Net non-cash LIFO (benefit) charge | (2.9) | 14.9 |
Unrealized (losses) gains on derivatives | 3.6 | 6.0 |
Fabricated Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net non-cash LIFO (benefit) charge | (2.9) | 14.9 |
Unrealized (losses) gains on derivatives | 3.1 | 4.3 |
Aluminum |  |  |
Segment Reporting Information [Line Items] |  |  |
Unrealized (losses) gains on derivatives | 5.2 | 3.1 |
Natural Gas |  |  |
Segment Reporting Information [Line Items] |  |  |
Unrealized (losses) gains on derivatives | (1.2) | 1.2 |
Electricity |  |  |
Segment Reporting Information [Line Items] |  |  |
Unrealized (losses) gains on derivatives | $ (0.9) | $ 0 |

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- Definition The change in the inventory reserve representing the cumulative difference in cost between the first in, first out and the last in, first out inventory valuation methods, which change has been reflected in the statement of income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6c) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section L Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6a) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6b) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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