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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Feb. 28, 2018 bbl	Mar. 31, 2013 bbl
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, period increase (decrease) | $	$ 0.2	$ (0.1)	$ 0.3	$ 0.3
El Dorado Clean Harbors February 2018 Release [Member]
Loss Contingencies [Line Items]
Crude oil released (in barrels)					6
SALA Gathering System February 2018 Release - First
Loss Contingencies [Line Items]
Crude oil released (in barrels)					203
El Dorado February 2018 Release [Member]
Loss Contingencies [Line Items]
Crude oil released (in barrels)					10
Magnolia Release
Loss Contingencies [Line Items]
Crude oil released (in barrels)						5,900
Magnolia Release | Other Current Liabilities [Member] | Magnolia Release
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies | $	1.0		1.0
Delek US | Omnibus Agreement | Operating Expense [Member] | Delek US and affiliates
Loss Contingencies [Line Items]
Reimbursement for costs incurred for asset failures | $	$ 1.4		$ 8.0

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