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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 $ 2,355,400,000us-gaap_LongTermDebt $ 2,547,800,000us-gaap_LongTermDebt        
Less current portion 6,500,000us-gaap_LongTermDebtCurrent 39,000,000us-gaap_LongTermDebtCurrent        
Total long-term debt 2,348,900,000us-gaap_LongTermDebtNoncurrent 2,508,800,000us-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 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember		 0us-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 65,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pkg_TermloanDueOctober2018Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		 650,000,000us-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 643,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pkg_TermloanDueOctober2020Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		 650,000,000us-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 150,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pkg_SeniorNotesSixPointFivePercentageSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 150,000,000us-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 399,700,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 399,700,000us-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 300,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= pkg_SeniorNotesThreePointNinePercentageSeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 300,000us-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 698,300,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pkg_A4.50SeniorNotesDueNovember2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 698,100,000us-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 1,700,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= pkg_A4.50SeniorNotesDueNovember2023Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 1,900,000us-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 398,900,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= pkg_A3.65SeniorNotesdueSeptember2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 0us-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 $ 1,100,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= pkg_A3.65SeniorNotesdueSeptember2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 $ 0us-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