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Inventories (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventories [Line Items]      
Inventories stated on the LIFO basis $ 10.9 $ 12.1  
Inventories stated value below replacement costs 20.5 20.2  
Cost of goods sold stated at below current replacement costs 2.7   2.6
Film Products [Member]
      
Inventories [Line Items]      
Cost of goods sold stated at below current replacement costs 1.1 1.1 0.9
Aluminum Extrusions [Member]
      
Inventories [Line Items]      
Cost of goods sold stated at below current replacement costs $ 1.6   $ 1.7