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Commitments and Contingencies - Crude Oil Releases (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, period increase (decrease)	$ 0.2	$ 0.1	$ 0.3	$ 0.1
Magnolia Release | Other Current Liabilities [Member] | Magnolia Release
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	2.2		2.2
Operating Expense [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	0.7		0.7
Delek US | Omnibus Agreement | Delek US and affiliates
Loss Contingencies [Line Items]
Reimbursement for costs incurred for asset failures	0.7	4.1	4.0	7.0
Delek US | Omnibus Agreement | Operating Expense [Member] | Delek US and affiliates
Loss Contingencies [Line Items]
Reimbursement for costs incurred for asset failures	$ 2.2	$ 6.4	$ 5.7	$ 6.4

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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