Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	$ 0.7	$ 16.2	$ 6.7	$ 27.9
Gain (Loss) on Disposition of Assets			(6.7)	(27.9)
RINs Obligation	58.8		58.8		$ 13.0
Other Sundry Liabilities, Noncurrent	0.0		0.0		19.8
Disposal Group, Including Discontinued Operation, Consideration, Working Capital Adjustment	0.0		0.0		6.9
Other	26.6		26.6		18.9
Derivative Liability	0.0		0.0		7.2
Total other current liabilities	85.4		85.4		$ 58.6
Fuel Product [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Assets				1.1
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	0.6	16.1	5.1	16.1
Operating Segments [Member] | Specialty Product [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	0.0	0.0	1.5	0.0
Operating Segments [Member] | Fuel Product [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets	$ 0.1	0.1	$ 0.1	11.8
Fluid Holding Corp [Member]
Property, Plant and Equipment [Line Items]
Loss on impairment and disposal of assets		$ 16.1		$ 16.1