Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	$ 6.0	$ 11.7
Gain (Loss) on Disposition of Assets	(6.0)	(11.7)
RINs Obligation	30.6		$ 13.0
Other Sundry Liabilities, Noncurrent	0.0		19.8
Disposal Group, Including Discontinued Operation, Consideration, Working Capital Adjustment	0.0		6.9
Other	18.4		18.9
Derivative Liability	1.2		7.2
Total other current liabilities	50.2		$ 58.6
Fuel Product [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Assets		1.0
Fuel Product [Member] | TexStar [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets		10.7
Operating Segments [Member] | Corporate Segment [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	4.5	0.0
Operating Segments [Member] | Specialty Product [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	1.5	0.0
Operating Segments [Member] | Fuel Product [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	$ 0.0	$ 11.7