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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Customer Relationships [Member]
Field Packaging Group [Member]
Sep. 30, 2011
Other [Member]
Field Packaging Group [Member]
Sep. 30, 2011
Field Packaging Group [Member]
Apr. 14, 2011
Field Packaging Group [Member]
Sep. 10, 2011
Packaging Materials Company [Member]
Business acquisition, cost of acquired entity   $ 26.9$ 8.7
Purchase price allocation to goodwill  10.6  
Purchase price allocation to intangible assets$ 10.4$ 0.2   
Intangible asset, useful life, in years103