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Segment and Geographical Area Information, Information by Geographical Area (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Information By Geographical Area Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales | $ 317.6 | $ 322.3 | $ 338.8 | $ 322.6 | $ 265.8 | $ 263.4 | $ 282.4 | $ 267.5 | $ 1,301.3 | [1] | $ 1,079.1 |  | $ 987.0 |
Income Taxes Paid |  |  |  |  |  |  |  |  | 3.5 |  | 0.8 |  | 12.8 |
Fabricated Products |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information By Geographical Area Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,301.3 |  | 1,078.8 |  | 897.1 |
Fabricated Products | United States |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information By Geographical Area Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 1,195.1 |  | 991.2 |  | 840.1 |
Income Taxes Paid |  |  |  |  |  |  |  |  | 1.7 |  | 0.1 |  | 4.0 |
Fabricated Products | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information By Geographical Area Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 106.2 |  | 87.6 |  | 57.0 |
Income Taxes Paid |  |  |  |  |  |  |  |  | 1.8 |  | 0.7 |  | 8.8 |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information By Geographical Area Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | 0 | [2] | 0.3 | [2] | 89.9 | [2]
All Other | United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |
Information By Geographical Area Line Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  | $ 0 |  | $ 0.3 |  | $ 89.9 |
[1] | The combined results presented for year ended December 31, 2011 are the actual results presented in the Statements of Consolidated Income, as the operating results for the Chandler, Arizona (Extrusion) facility were included in the Company's consolidated operating results commencing January 1, 2011 (see Note 1).
[2] | Net sales in All Other in 2010 represent residual activity involving primary aluminum purchased by the Company from Anglesey while it continued its smelting operations, prior to September 30, 2009, and resold by the Company in the first quarter of 2010. In connection with Anglesey’s remelt operations beginning in the fourth quarter of 2009, the Company changed its basis of revenue recognition from gross to a net basis (see Note 1).

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