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Commitments and Contingencies (Details 2) (Inventory, USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Inventory
Inventory Purchase Commitments
Firm commitments to purchase inventory, operating assets and other supplies	$ 2.9

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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