Acquisitions (Details 2) (Alcan Packaging Food Americas, USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Mar. 02, 2010
Acquired finite-lived intangible assets
Estimated amortization expense	$ 3,500,000	$ 5,600,000
Fair value			130,300,000
Customer relationships
Acquired finite-lived intangible assets
Useful life (in years)	20
Fair value			87,300,000
Technology based
Acquired finite-lived intangible assets
Useful life (in years)	15
Fair value			39,700,000
Order backlog
Acquired finite-lived intangible assets
Useful life (in months)	1
Fair value			$ 3,300,000