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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | [2] | Jun. 30, 2016 USD ($) | [3] | Mar. 31, 2016 USD ($) | [4] | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | [6] | Jun. 30, 2015 USD ($) | [7] | Mar. 31, 2015 USD ($) | [8] | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development costs |  |  |  |  |  |  |  |  |  |  | $ 13.3 | $ 13.1 | $ 12.3 |
Cash and cash equivalents | $ 239.3 |  |  |  |  | $ 184.2 |  |  |  |  | 239.3 | 184.2 | 124.9 | $ 191.0
Cash equivalents | 178.4 |  |  |  |  | 140.9 |  |  |  |  | 178.4 | 140.9 |  |
Allowance for doubtful accounts | 3.8 |  |  |  |  | 3.9 |  |  |  |  | $ 3.8 | 3.9 |  |
Customer returns, allowances and earned discounts as a percentage of gross selling price |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Reserve for customer accounts receivable, percentage |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Reserve for customer deductions |  |  |  |  |  |  |  |  |  |  | $ 6.3 | 6.4 |  |
Net income attributable to Packaging Corporation of America | 110.6 | [1] | $ 119.4 | $ 115.9 | $ 103.7 | 104.3 | [5] | $ 127.8 | $ 114.0 | $ 90.8 | 449.6 | 436.8 | 392.6 |
Inventories | 723.6 |  |  |  |  | 676.8 |  |  |  |  | 723.6 | 676.8 |  |
Retained earnings | 1,447.1 |  |  |  |  | 1,317.3 |  |  |  |  | 1,447.1 | 1,317.3 |  |
Interest capitalization, construction in progress |  |  |  |  |  |  |  |  |  |  | $ 2.5 | $ 2.0 | 2.8 |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 12 years 10 months 25 days | 13 years 2 months 40 days |  |
Goodwill | 737.9 |  |  |  |  | 544.0 |  |  |  |  | $ 737.9 | $ 544.0 |  | $ 546.8
Deferred financing costs | 12.4 |  |  |  |  | 12.3 |  |  |  |  | $ 12.4 | 12.3 |  |
Area leased under timberland cutting rights (acres) | a |  |  |  |  |  |  |  |  |  |  | 75,000 |  |  |
Area leased where fiber farms are operated (acres) | a |  |  |  |  |  |  |  |  |  |  | 9,000 |  |  |
Software amortization expense |  |  |  |  |  |  |  |  |  |  | $ 2.5 | 3.0 | 2.9 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of senior credit facilities and notes, in years |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of senior credit facilities and notes, in years |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Foreign operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 3.4 |  |  |  |  | 3.1 |  |  |  |  | $ 3.4 | $ 3.1 |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 13 years 1 month 5 days | 13 years 4 months |  |
Customer relationships | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Customer relationships | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |
Trademarks and trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 10 years 5 months 30 days | 12 years 5 months 33 days |  |
Trademarks and trade names | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Trademarks and trade names | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Cutting Rights and Fiber Farms |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depletion expense |  |  |  |  |  |  |  |  |  |  | $ 4.7 | $ 7.0 | $ 7.3 |
Other long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net capitalized software costs | 4.5 |  |  |  |  | 6.9 |  |  |  |  | 4.5 | 6.9 |  |
Other long-term assets | Cutting Rights and Fiber Farms |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term lease costs capitalization (Cutting rights and Fiber farms) | $ 43.9 |  |  |  |  | 40.2 |  |  |  |  | $ 43.9 | 40.2 |  |
Adjustments for New Accounting Pronouncement | Other long-term assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  | (12.3) |  |  |  |  |  | (12.3) |  |
Adjustments for New Accounting Pronouncement | Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  | $ (12.3) |  |  |  |  |  | $ (12.3) |  |
[1] | Includes $4.5 million of closure costs related to a corrugated products facility and a paper products facility ($2.9 million after-tax or $0.03 per diluted share), $2.7 million of costs related to ceased production of softwood market pulp operations at our Wallula, Washington mill and the permanent shutdown of the No.1 machine ($1.8 million after-tax or $0.02 per diluted share), and $1.2 million of acquisition-related costs for TimBar Corporation and Columbus Container, Inc. acquisitions ($0.8 million after-tax or $0.01 per diluted share).
[2] | Includes $2.0 million of closure costs related to a corrugated products facility and a paper products facility ($1.4 million after-tax or $0.02 per diluted share) and $2.9 million of acquisition-related costs for TimBar Corporation and Columbus Container, Inc. acquisitions ($1.9 million after-tax or $0.02 per diluted share).
[3] | Includes $1.7 million of closure costs related to a corrugated products facility and a paper products facility ($1.0 million after-tax or $0.01 per diluted share), $0.3 million of acquisition-related costs for TimBar Corporation ($0.2 million after-tax or $0.0 per diluted share), and $0.9 million related to our withdrawal from a multiemployer pension plan for one of our corrugated products facilities ($0.6 million after-tax or $0.01 per diluted share).
[4] | Includes $2.8 million of closure costs related to a corrugated products facility and a paper products facility. ($1.9 million after-tax or $0.02 per diluted share).
[5] | Includes $3.5 million of income from DeRidder restructuring ($2.2 million after-tax or $0.02 per diluted share) and $3.8 million of integration-related and other costs ($2.6 million after-tax or $0.03 per diluted share).
[6] | Includes $3.8 million of income from DeRidder restructuring ($2.3 million after-tax or $0.02 per diluted share) and $2.4 million of integration-related and other costs ($1.7 million after-tax or $0.02 per diluted share). Also includes $6.7 million gain from the sale of our paper mill site at St. Helens, Oregon ($4.4 million after tax or $0.05 per diluted share).
[7] | Includes $1.0 million of income from DeRidder restructuring ($0.7 million after-tax or $0.01 per diluted share) and $3.7 million of integration-related and other costs ($2.3 million after-tax or $0.03 per diluted share).
[8] | Includes $10.3 million of DeRidder restructuring charges ($6.6 million after-tax or $0.07 per diluted share) and $3.5 million of integration-related and other costs ($2.2 million after-tax or $0.02 per diluted share). Also includes a $3.6 million tax credit from the State of Louisiana related to our capital investment and the jobs retained at the DeRidder, Louisiana mill.

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