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Commitments and Contingencies - Crude Oil Releases (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Feb. 28, 2018 bbl	Mar. 31, 2013 bbl
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, period increase (decrease)	$ 0.3	$ 0.1	$ 0.4
Accrual for environmental loss contingencies, expected reimbursements		7.8
SALA Gathering System February 2018 Release - First
Loss Contingencies [Line Items]
Crude oil released (in barrels) | bbl				203
Magnolia Release
Loss Contingencies [Line Items]
Crude oil released (in barrels) | bbl					5,900
Magnolia Release | Other Current Liabilities [Member] | Magnolia Release
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 1.0

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