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Discontinued Operations (Details) (Aluminum Extrusions Canada Business, USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
Feb. 12, 2008
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Aluminum Extrusions Canada Business
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of business $ 25,000,000      
Charges for indemnifications under the purchase agreement related to environmental matters   8,300,000 0 13,500,000
Charges for indemnifications under the purchase agreement related to environmental matters, net of tax   $ 8,300,000   $ 13,500,000