Segment Data - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) bbl / pure facility	Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Intercompany fees and sales	$ 0.0	$ 0.0
Tyler Refinery
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	75,000
El Dorado Refinery
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	80,000
Krotz Springs, Louisiana
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	74,000
Big Spring, Texas
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	73,000
Refining
Segment Reporting Information [Line Items]
Number of biodiesel facilities | facility	2
Refining | RIN Sales
Segment Reporting Information [Line Items]
Intercompany fees and sales	$ 0.4	1.2
Refining | Products and Services to Retail Segment
Segment Reporting Information [Line Items]
Intercompany fees and sales	90.2	96.3
Refining | Asphalt
Segment Reporting Information [Line Items]
Intercompany fees and sales	14.9	3.4
Logistics
Segment Reporting Information [Line Items]
Intercompany fees and sales	79.5	83.4
Logistics | Operating Segments
Segment Reporting Information [Line Items]
Intercompany fees and sales	1.8
Logistics | Crude Transportation and Storage Fees
Segment Reporting Information [Line Items]
Intercompany fees and sales	52.2	54.3
Tyler Refinery | Logistics | Refining Marketing Services
Segment Reporting Information [Line Items]
Intercompany fees and sales	4.8	5.0
Big Spring refinery | Logistics | Refining Marketing Services
Segment Reporting Information [Line Items]
Intercompany fees and sales	$ 3.7	$ 1.1
Refining
Segment Reporting Information [Line Items]
Refinery throughput capacity (in bpd)	302,000