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Discontinued Operations (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2012 | Nov. 20, 2012 Falling Springs [Member] | Feb. 12, 2008 Aluminum Extrusions Canada Business [Member] | Sep. 30, 2013 Aluminum Extrusions Canada Business [Member] | Sep. 30, 2012 Aluminum Extrusions Canada Business [Member] | Sep. 30, 2013 Aluminum Extrusions Canada Business [Member] | Sep. 30, 2012 Aluminum Extrusions Canada Business [Member]
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 |  |  |  |  |
Sales reclassified to discontinued operations | 2.2 | 3.0 |  |  |  |  |  |
Net income reclassified to discontinued operations | 0.3 | 0.3 |  |  |  |  |  |
Charges for indemnifications under the purchase agreement related to environmental matters |  |  |  |  | (0.5) | (7.1) | (14.0) | (11.9)
Charges for indemnifications under the purchase agreement related to environmental matters, net of tax |  |  |  |  | $ (0.5) | $ (7.1) | $ (14.0) | $ (11.9)

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- Definition Pretax adjustment to an amount previously reported in discontinued operations that is directly related to the disposal of the component in a prior period. Examples of circumstances leading to such adjustments include the resolution of contingencies relating to the terms of the disposal transaction or relating to the operations of the component prior to its disposal, and the settlement of certain employee benefit plan obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1012-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1510-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1020-107759 + Details
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