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INCOME TAXES (Details 2) (USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2010 Alcan Packaging Food Americas
Income tax contingency
Unrecognized tax benefits	$ 25.6	$ 24.0	$ 11.6	$ 7.7
Unrecognized tax benefits, amount of interest and penalties related to pre-acquisition tax positions of prior years				6.7
Significant reduction in gross unrecognized tax benefits is reasonably possible, high end of range	$ 6.0

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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