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Inventories (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventories [Line Items]      
Inventories stated on the LIFO basis $ 10.0 $ 10.9  
Inventories stated value below replacement costs 15.8 20.5  
Cost of goods sold stated at below current replacement costs   2.7  
Film Products
      
Inventories [Line Items]      
Cost of goods sold stated at below current replacement costs 0.9 1.1 1.1
Aluminum Extrusions
      
Inventories [Line Items]      
Cost of goods sold stated at below current replacement costs   $ 1.6