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Transactions With Related Party (Details) - Unconsolidated variable interest entity [Member] - Louisiana Timber Procurement Company, L.L.C. (LTP) [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Related Party Transaction [Line Items]        
Variable interest entity, ownership percentage     50.00%  
Revenue from related parties $ 5.0 $ 7.0 $ 16.3 $ 21.3
Related parties amount in cost of sales $ 25.2 $ 21.9 $ 70.3 $ 56.9
Packaging Corporation of America (PCA) [Member]        
Related Party Transaction [Line Items]        
Variable interest entity, ownership percentage     50.00%