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Derivative Financial Instruments (Schedule Of Forward Purchase And Sales Contracts) (Details) (Forward Contracts [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014 bbl
Forward Contracts [Member]
Derivative [Line Items]
Forward purchase contracts, Amount	$ 73.4
Forward purchase contracts, Barrels	1,300,000
Forward sale contracts, Amount	$ 25.2
Forward sale contracts, Barrels	200,000

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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- Definition

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 must commit resources to supply goods or services to one or more customers.

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