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Discontinued Operations (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Nov. 20, 2012 Falling Springs | Feb. 12, 2008 Aluminum Extrusions Canada Business | Dec. 31, 2013 Aluminum Extrusions Canada Business | Dec. 31, 2012 Aluminum Extrusions Canada Business | Dec. 31, 2011 Aluminum Extrusions Canada Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of membership interests |  |  | $ 16.6 |  |  |  |
Proceeds from sale of business |  |  | 12.8 | 25.0 |  |  |
Common stock received from sale of membership interests |  |  | 209,576 |  |  |  |
Loss on sale of membership interests |  |  | 3.1 |  |  |  |
Transaction-related expenses |  |  | 0.5 |  |  |  |
Sales reclassified to discontinued operations | 3.2 | 3.2 |  |  |  |  |
Net income reclassified to discontinued operations | 0.5 | 0.7 |  |  |  |  |
Accrual for indemnifications under the purchase agreement related to environmental matters |  |  |  |  | 14.0 | 13.4 | 4.4
Accrual for indemnifications under the purchase agreement related to environmental matters, net of tax |  |  |  |  | $ 14.0 | $ 13.4 | $ 4.4

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