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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
Dec. 31, 2010
Nov. 20, 2012
Falling Springs [Member]
Feb. 12, 2008
Aluminum Extrusions Canada Business [Member]
Dec. 31, 2012
Aluminum Extrusions Canada Business [Member]
Dec. 31, 2011
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      
Loss on sale of membership interests       (3.1)      
Transaction-related expenses       0.5      
Sales reclassified to discontinued operations 3.2 3.2 2.3        
Net income reclassified to discontinued operations 0.5 0.7 0.2        
Accrual for indemnifications under the purchase agreement related to environmental matters           13.4 4.4
Accrual for indemnifications under the purchase agreement related to environmental matters, net of tax           $ 13.4 $ 4.4