Segment Data - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	May 07, 2020 USD ($)	Dec. 31, 2020 USD ($) bbl / d segment store facility $ / shares	Dec. 31, 2019 USD ($) store	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment		3
Cash consideration | $	$ 40.0
Gain on sale of business | $	$ 56.8	$ 0.0	$ 0.0	$ 13.3
Rights to acquire subsidiary, percent	33.33%
Rights to acquire subsidiary, USD per unit | $ / shares		$ 400
Rights to acquire subsidiary, total consideration | $		$ 13.3
Number of stores | store		253	252
Proceeds from sale of retail stores | $		$ 0.0	$ 15.1	$ 0.0
Refining
Segment Reporting Information [Line Items]
Total throughput capacity		302,000
Number of biodiesel facilities | facility		3
Tyler Refinery | Refining
Segment Reporting Information [Line Items]
Total throughput capacity		75,000
El Dorado | Refining
Segment Reporting Information [Line Items]
Total throughput capacity		80,000
Big Spring | Refining
Segment Reporting Information [Line Items]
Total throughput capacity		73,000
Krotz Springs | Refining
Segment Reporting Information [Line Items]
Total throughput capacity		74,000
Disposal Group, Not Discontinued Operations | Retail Stores
Segment Reporting Information [Line Items]
Number of stores | store		1	30