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Acquisition (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2012
Field Packaging Group [Member]
Apr. 14, 2011
Field Packaging Group [Member]
Mar. 31, 2012
Packaging Materials Company [Member]
Sep. 10, 2011
Packaging Materials Company [Member]
Mar. 31, 2012
Colorado Container [Member]
Nov. 30, 2011
Colorado Container [Member]
Mar. 31, 2012
Packaging Specialists [Member]
Mar. 16, 2012
Packaging Specialists [Member]
Mar. 31, 2012
Customer Relationships [Member]
Y
Mar. 31, 2012
Customer Relationships [Member]
Field Packaging Group [Member]
Y
Nov. 30, 2011
Customer Relationships [Member]
Colorado Container [Member]
Y
Mar. 31, 2012
Other Intangible Assets [Member]
Y
Mar. 31, 2012
Other Intangible Assets [Member]
Field Packaging Group [Member]
Y
Nov. 30, 2011
Other Intangible Assets [Member]
Colorado Container [Member]
Y
Business Acquisition [Line Items]                            
Business acquisition date April 14, 2011   September 10, 2011   November 30, 2011   March 16, 2012              
Business acquisition, cost of acquired entity   $ 26.9   $ 8.6   $ 21.8   $ 35.5            
Purchase price allocation to goodwill 11.5     1.5   5.8                
Purchase price allocation to intangible assets                   $ 9.5 $ 5.8   $ 0.2 $ 0.2
Intangible asset, useful life, in years                 18.2 10 10 3.0 3 3