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Commitments supplier obligation (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Commitments [Abstract]
Purchase Commitment, Remaining Minimum Amount Committed	$ 6.9

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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