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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts and customer deductions $ 11.3pkg_AllowanceForDoubtfulAccountsReceivableAndReserveForCustomerDeductionsCurrent $ 10.6pkg_AllowanceForDoubtfulAccountsReceivableAndReserveForCustomerDeductionsCurrent
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 98,368,000us-gaap_CommonStockSharesIssued 98,172,000us-gaap_CommonStockSharesIssued