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Segment and Geographical Area Information 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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 Suppliers | Dec. 31, 2011 | Dec. 31, 2010
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers | $ 314.0 |  | $ 335.5 | $ 345.2 | $ 365.4 | $ 317.6 |  | $ 322.3 | $ 338.8 | $ 322.6 | $ 1,360.1 |  | $ 1,301.3 |  | $ 1,079.1 |
Income taxes paid |  |  |  |  |  |  |  |  |  |  | 1.8 |  | 3.5 |  | 0.8 |
Long-lived assets | 384.3 | [1] |  |  |  | 367.8 | [1] |  |  |  | 384.3 | [1] | 367.8 | [1] | 354.1 | [1]
Percentage of total revenue from the Company's largest customer |  |  |  |  |  |  |  |  |  |  | 22.00% |  | 21.00% |  | 23.00% |
Export sales percentage |  |  |  |  |  |  |  |  |  |  | 18.00% |  | 14.00% |  | 13.00% |
Number of Company's major suppliers |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Top five major suppliers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of primary aluminum from Company's supplier over total purchases |  |  |  |  |  |  |  |  |  |  | 78.00% |  | 83.00% |  | 85.00% |
Largest supplier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of primary aluminum from Company's supplier over total purchases |  |  |  |  |  |  |  |  |  |  | 29.00% |  | 32.00% |  | 33.00% |
Second and third largest suppliers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of primary aluminum from Company's supplier over total purchases |  |  |  |  |  |  |  |  |  |  | 31.00% |  | 34.00% |  | 36.00% |
Fabricated Products |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  | 1,360.1 |  | 1,301.3 |  | 1,078.8 |
Long-lived assets | 380.0 | [1] |  |  |  | 363.3 | [1] |  |  |  | 380.0 | [1] | 363.3 | [1] | 348.8 | [1]
Fabricated Products | United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  | 1,256.5 |  | 1,195.1 |  | 991.2 |
Income taxes paid |  |  |  |  |  |  |  |  |  |  | 0.5 |  | 1.7 |  | 0.1 |
Long-lived assets | 367.5 | [1] |  |  |  | 351.4 | [1] |  |  |  | 367.5 | [1] | 351.4 | [1] | 337.3 | [1]
Fabricated Products | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  | 103.6 |  | 106.2 |  | 87.6 |
Income taxes paid |  |  |  |  |  |  |  |  |  |  | 1.3 |  | 1.8 |  | 0.7 |
Long-lived assets | 12.5 | [1] |  |  |  | 11.9 | [1] |  |  |  | 12.5 | [1] | 11.9 | [1] | 11.5 | [1]
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0.3 | [2]
Long-lived assets | 4.3 | [1] |  |  |  | 4.5 | [1] |  |  |  | 4.3 | [1] | 4.5 | [1] | 5.3 | [1]
All Other | United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-lived assets | 4.3 | [1] |  |  |  | 4.5 | [1] |  |  |  | 4.3 | [1] | 4.5 | [1] | 5.3 | [1]
All Other | United Kingdom |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers, Income Taxes Paid, and Long-Lived Assets [LIne Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0.3 |
[1] | Long-lived assets represent Property, plant and equipment, net.
[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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