The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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Segment Information (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
Segment Information (Narrative) (Details) $ in Millions	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Reportable segments	2
HEP [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	$ 14.7	$ 47.4	$ 40.4
SLC Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	25.00%	25.00%
UNEV Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	75.00%	75.00%
Frontier Pipeline [Member]
Segment Reporting Information [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%