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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Additional Information (Details) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2010 | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Capital commitments |  |  | $ 94.7 | $ 83.7 |
Area leased under timberland cutting rights (acres) | a |  |  | 75,000 |  |
Average lease renewal term |  |  | 6 years |  |
Total lease expense |  |  | $ 88.3 | 87.9 | $ 85.6
Capital lease obligations |  |  | 21.6 | 22.8 |
Interest paid, capital lease obligations |  |  | 1.5 | 1.6 | 1.5
Purchases during period under purchase agreements |  |  | 362.0 | 299.6 | 265.9
Environmental reserve |  |  | 25.3 |  |
Environmental liabilities and asset retirement obligations |  |  | 6.4 | 7.9 |
Number of other U.S. and Canadian containerboard producers |  | PCA and eight other U.S. and Canadian containerboard producers were named as defendants |  |  |
Number of lawsuits filed by the plaintiffs |  | 5 |  |  |
Class action lawsuit settlement | [1] |  | 0.0 | $ 0.0 | $ 17.6
Asset Retirement Obligation |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  |  | 17.2 |  |
Environmental Contingencies |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  |  | 8.1 |  |
Other Long-Term Liabilities |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  |  | $ 18.9 |  |
Minimum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Purchase commitments term, years |  |  | 1 year |  |
Maximum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Remaining lease term |  |  | 14 years |  |
Purchase commitments term, years |  |  | 22 years |  |
[1] | Includes $17.6 million of costs for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit. See Note 18, Commitments, Guarantees, Indemnifications, and Legal Proceedings, for more information.

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