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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Related Party Transaction [Line Items]        
Variable interest entity, ownership percentage     50.00%  
Revenue from related parties $ 3.8 $ 4.0 $ 13.3 $ 13.3
Cost of Sales [Member]        
Related Party Transaction [Line Items]        
Cost of sales from related party $ 23.9 $ 21.2 $ 66.3 $ 64.7
Packaging Corporation of America (PCA) [Member]        
Related Party Transaction [Line Items]        
Variable interest entity, ownership percentage     50.00%