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Carrying amount as of the balance sheet date of the liability for remediation, site restoration, postclosure, monitoring commitments, or other exit costs associated with the sale, disposal or abandonment of a particular property resulting from unanticipated contamination of the assets.

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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions		12 Months Ended
	Nov. 20, 2019 USD ($)	Dec. 31, 2020 USD ($) crudeOilRelease	Dec. 31, 2019 USD ($) crudeOilRelease	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Number of crude oil releases \| crudeOilRelease		0	5
Environmental exit costs, costs accrued to date		$ 0.5	$ 7.1
Expense recorded, net of total reimbursable costs		0.1	0.4
Operating and maintenance expenses
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		0.3
Delek US \| Omnibus Agreement \| Delek
Loss Contingencies [Line Items]
Recovery of direct costs		0.1	4.8
Delek US \| Operating and maintenance expenses \| Omnibus Agreement \| Delek
Loss Contingencies [Line Items]
Recovery of direct costs		$ 0.1	6.3	$ 8.2
Other Current Liabilities \| Magnolia Station Spill \| Magnolia Station Spill
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies				$ 2.2
State of Arkansas \| Other Current Liabilities \| Magnolia Station Spill \| Magnolia Station Spill
Loss Contingencies [Line Items]
Environmental remediation expense	$ 0.6
DOJ \| Other Current Liabilities \| Magnolia Station Spill \| Magnolia Station Spill
Loss Contingencies [Line Items]
Environmental remediation expense			$ 1.7