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Document and Entity Information
 9 Months Ended
Sep. 30, 2013
Nov. 06, 2013
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q3  
Trading Symbol PKG  
Entity Registrant Name PACKAGING CORP OF AMERICA  
Entity Central Index Key 0000075677  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   98,075,901