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Document and Entity Information
Dec. 10, 2019
Cover [Abstract]  
Entity Registrant Name PACKAGING CORP OF AMERICA
Amendment Flag true
Entity Central Index Key 0000075677
Document Type 8-K/A
Document Period End Date Dec. 10, 2019
Entity Incorporation, State or Country Code DE
Entity File Number 1-15399
Entity Tax Identification Number 36-4277050
Entity Address, Address Line One 1955 West Field Court
Entity Address, City or Town Lake Forest
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60045
City Area Code (847)
Local Phone Number 482-3000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol PKG
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Description On December 13, 2019, PCA filed a Current Report on Form 8-K (the “December 2019 Report”), reporting that Donna A. Harman was elected to the board of directors on December 10, 2019. PCA hereby amends the December 2019 Report and reports that, on February 25, 2020: (1) Ms. Harman was determined by the board of directors to be independent; and (2) Ms. Harman was elected to the audit committee of the board of directors. All other information included in the December 2019 Report remains unchanged.