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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
	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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