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Transactions With Related Party (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
LouisianaTimberProcurementCompanyLLC [Member] | Packaging Corporation of America (PCA) [Member]    
Related Party Transaction [Line Items]    
Variable interest entity, ownership percentage 50.00%  
LouisianaTimberProcurementCompanyLLC [Member] | Unconsolidated variable interest entity [Member]    
Related Party Transaction [Line Items]    
Variable interest entity, ownership percentage 50.00%  
Equity Method Investee [Member] | Unconsolidated variable interest entity [Member]    
Related Party Transaction [Line Items]    
Revenue from related party $ 4.3 $ 5.0
Cost of sales from related party $ 20.4 $ 21.9