Acquisitions (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 01, 2010
Business Acquisition [Abstract]
Amortization of Intangible Assets	$ 18.1	$ 18.1	$ 18.9
Alcan Packaging Food Americas [Member]
Business Acquisition [Abstract]
Amortization of Intangible Assets	8.3	7.0	9.1
Other intangible assets				130.3
Customer Relationships [Member]
Business Acquisition [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			6 years
Customer Relationships [Member] | Alcan Packaging Food Americas [Member]
Business Acquisition [Abstract]
Other intangible assets				87.3
Technology [Member]
Business Acquisition [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
Technology [Member] | Alcan Packaging Food Americas [Member]
Business Acquisition [Abstract]
Other intangible assets				39.7
Order or Production Backlog [Member]
Business Acquisition [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			1 month
Order or Production Backlog [Member] | Alcan Packaging Food Americas [Member]
Business Acquisition [Abstract]
Other intangible assets				$ 3.3