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Commitments and Contingencies - Crude Oil Releases (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 20, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Environmental exit costs, costs accrued to date		$ 7.1
Expense recorded, net of total reimbursable costs		0.4	$ 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		4.8	9.8
Delek US | Operating and maintenance expenses | Omnibus Agreement | Delek
Loss Contingencies [Line Items]
Recovery of direct costs		6.3	8.2	$ 0.3
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

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

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