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Stockholders' Equity (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Dec. 09, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 26, 2015
Mar. 31, 2015
May 15, 2013
Common stock dividends paid   $ 157.4us-gaap_PaymentsOfDividendsCommonStock $ 109.1us-gaap_PaymentsOfDividendsCommonStock $ 117.8us-gaap_PaymentsOfDividendsCommonStock      
Dividends declared per common share $ 0.40us-gaap_CommonStockDividendsPerShareDeclared $ 1.60us-gaap_CommonStockDividendsPerShareDeclared $ 1.51us-gaap_CommonStockDividendsPerShareDeclared $ 1.00us-gaap_CommonStockDividendsPerShareDeclared      
Subsequent Event              
Common stock dividends paid           $ 39.4us-gaap_PaymentsOfDividendsCommonStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Dividends declared per common share         $ 0.55us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Annual Dividend [Member]              
Dividends declared per common share             $ 1.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= pkg_AnnualDividendMember
Annual Dividend [Member] | Subsequent Event              
Dividends declared per common share         $ 2.20us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_DividendsAxis
= pkg_AnnualDividendMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember