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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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