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Discontinued Operations (Details) - Aluminum Extrusions Canada Business - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Feb. 12, 2008	Sep. 30, 2014	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 25.0
Charges for indemnifications under the purchase agreement related to environmental matters		$ (0.9)	$ (0.9)
Charges for indemnifications under the purchase agreement related to environmental matters, net of tax		$ (0.9)	$ (0.9)

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Amount before tax of an increase (decrease) to a gain (loss) previously reported in discontinued operations in a prior period.

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