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Debt - Summary of Debt (Details) (USD $) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 25, 2008 | Jun. 26, 2012 | Oct. 22, 2013 | Sep. 05, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 2,355,400,000 us-gaap_LongTermDebt | $ 2,547,800,000 us-gaap_LongTermDebt |  |  |  |
Less current portion | 6,500,000 us-gaap_LongTermDebtCurrent | 39,000,000 us-gaap_LongTermDebtCurrent |  |  |  |
Total long-term debt | 2,348,900,000 us-gaap_LongTermDebtNoncurrent | 2,508,800,000 us-gaap_LongTermDebtNoncurrent |  |  |  |
Weighted-average interest rate | 3.56%us-gaap_DebtWeightedAverageInterestRate | 3.08%us-gaap_DebtWeightedAverageInterestRate |  |  |  |
Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 0 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |
Stated interest rate | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |  |  |
Credit facility, expiration date | Oct. 18, 2018 |  |  |  |  |
Five-Year Term Loan, due October 2018 | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 65,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 650,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |
Debt instrument, maturity date | Oct. 18, 2018 |  |  |  |  |
Seven-Year Term Loan, due October 2020 | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 643,500,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember | 650,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember |  |  |  |
Debt instrument, maturity date | Oct. 18, 2020 |  |  |  |  |
6.50% Senior Notes due March 2018 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 150,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 150,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Stated interest rate | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Debt instrument, maturity date | Mar. 15, 2018 |  |  |  |  |
3.90% Senior Notes, due June 2022 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 399,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 399,700,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Stated interest rate | 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 3.90%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Debt instrument, maturity date | Jun. 15, 2022 |  |  |  |  |
Senior notes, discount | 300,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 300,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
4.50% Senior Notes, due November 2023 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 698,300,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 698,100,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Stated interest rate | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  | 4.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt instrument, maturity date | Nov. 01, 2023 |  |  |  |  |
Senior notes, discount | 1,700,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 1,900,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = pkg_A4.50SeniorNotesDueNovember2023Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
3.65% Senior Notes, due September 2024 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 398,900,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Stated interest rate | 3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  | 3.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Debt instrument, maturity date | Sep. 15, 2024 |  |  |  |  |
Senior notes, discount | $ 1,100,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 0 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = pkg_A3.65SeniorNotesdueSeptember2024Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Current Portion of Long-term Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 1.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_CurrentPortionOfLongTermDebtMember | 1.59%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_CurrentPortionOfLongTermDebtMember |  |  |  |
Long-term Debt, Excluding Current Portion |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted-average interest rate | 3.56%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = pkg_LongTermDebtExcludingCurrentPortionMember | 3.10%us-gaap_DebtWeightedAverageInterestRate / us-gaap_DebtInstrumentAxis = pkg_LongTermDebtExcludingCurrentPortionMember |  |  |  |
London Interbank Offered Rate (LIBOR) | Five-Year Term Loan, due October 2018 | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 1.54%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | 1.54%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
London Interbank Offered Rate (LIBOR) | Seven-Year Term Loan, due October 2020 | Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 1.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember | 1.79%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = pkg_TermloanDueOctober2020Member / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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