Commitments and Contingencies - Narrative - Environmental (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
shreveport [Member]
Loss Contingencies [Line Items]
Environmental Applicability, Impact and Conclusion Disclosures	$ 0.1
Fair Value, Measurements, Recurring
Loss Contingencies [Line Items]
RINs Obligation	(30.6)	$ (13.0)
Fair Value, Measurements, Recurring \| Level 2
Loss Contingencies [Line Items]
RINs Obligation	$ (30.6)	$ (13.0)

The adjustment to exclude the noncash portion of, and include cash payments for environmental costs when calculating operating cash flows under the indirect method. The adjustment can include the increase (decrease) during an accounting period in total estimated obligations recorded for probable future loss attributable to environmental contamination issues.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Name:	us-gaap_EnvironmentalExpenseAndLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration