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Segment and Geographical Area Information, Textuals (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2013 Fabricated Products | Mar. 31, 2012 Fabricated Products | Mar. 31, 2013 United States productionfacilities | Mar. 31, 2013 Canada productionfacilities | Mar. 31, 2013 Anglesey Aluminium Limited | Dec. 31, 2012 Anglesey Aluminium Limited
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Number of production facilities |  |  |  |  | 11 | 1 |  |
Ownership percentage of Anglesey |  |  |  |  |  |  |  | 49.00%
Value of investment in Anglesey |  |  |  |  |  |  | $ 0 |
Net non-cash LIFO benefits | (3.7) | (2.9) |  |  |  |  |  |
Unrealized (losses) gains on derivatives | (0.3) | 3.6 | (0.7) | 3.1 |  |  |  |
VEBA net periodic pension benefit income | $ (5.6) | $ (3.0) |  |  |  |  |  |

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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