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Environmental Liabilities (Details) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011
Environmental Liabilities
Remediation costs	$ 3.2
Environmental reserve	$ 10.2

X

- Definition

Total costs incurred arising from requirements to perform environmental remediation activities.

+ Details

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Namespace Prefix:	pkg
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 96-1

-Paragraph 161

-Subparagraph a



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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