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Commitments supplier obligation (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Commitments [Abstract]
Purchase Commitment, Remaining Minimum Amount Committed	$ 9.7

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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