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Segment and Geographical Area Information, Textuals (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |
(Decrease) increase in Fabricated Products segment operating income relating to primary aluminum hedging activities |  | $ (25.0) | $ 3.1
Increase in Fabricated Products segment asset related to primary aluminum hedging activities |  | 0.6 |
Net non-cash LIFO (benefits) charges | (4.9) | (7.1) | 16.5
Environmental expense | 1.2 | 3.9 | 13.9
Impairment charge | 4.4 | 0 | 4.6
Unrealized gains (losses) on derivatives | 16.0 | (25.9) | (5.6)
Non-cash net periodic benefit (income) costs | (11.5) | (5.7) | 5.1
Fabricated Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Net non-cash LIFO (benefits) charges | (4.9) | (7.1) | 16.5
Environmental expense | 1.1 | 1.7 | 13.6
Unrealized gains (losses) on derivatives | 15.2 | (29.9) | (0.7)
United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of production facilities | 11 |  |
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of production facilities | 1 |  |
Anglesey Aluminium Limited |  |  |
Segment Reporting Information [Line Items] |  |  |
Ownership percentage of Anglesey | 49.00% |  |
VEBAs |  |  |
Segment Reporting Information [Line Items] |  |  |
Non-cash net periodic benefit (income) costs | (11.9) | (6.0) | 5.1
Idled equipment | Fabricated Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairment charge | 4.4 |  | 2.0
Sale of Greenwood, South Carolina facility | Fabricated Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairment charge |  |  | 1.9
Sale of Greenwood, South Carolina facility | Idled equipment | Fabricated Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Impairment charge |  |  | $ 3.9

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