Segments and Related Information - Schedule of Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Sales	$ 453.7		$ 1,146.3	$ 1,748.2
Gain (loss) from unconsolidated affiliates				3.8
Adjusted EBITDA	41.0	$ 77.0	124.7	136.7
Reconciling items to net loss:
Depreciation and amortization	29.8	32.6	61.3	65.6
Effect of LIFO liquidation and Inventory write-down	(32.1)	(2.6)	34.4	(40.6)
Gain on sale of unconsolidated affiliate				(1.2)
Non-recurring charges			(1.2)
Unrealized (gain) loss on derivatives	1.2	12.2	(30.4)	14.8
Interest expense	30.6	33.1	59.9	65.4
(Gain) loss on debt extinguishment	0.0	(0.3)	0.0	(0.7)
Loss on impairment and disposal of assets	0.7	16.2	6.7	27.9
Equity-based compensation and other items	7.0	2.3	4.1	5.7
Income tax expense from continuing operations	0.2	0.3	0.7	0.2
Net income	3.6	(16.8)	(10.8)	(0.4)
External Customers [Member]
Segment Reporting Information [Line Items]
Sales	453.7	896.9	1,146.3	1,748.2
Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	0.0	0.0	0.0	0.0
Operating Segments [Member] | Specialty Product [Member]
Segment Reporting Information [Line Items]
Sales	243.9	368.8	588.2	743.8
Gain (loss) from unconsolidated affiliates				3.8
Adjusted EBITDA	56.1	55.1	120.6	113.5
Reconciling items to net loss:
Depreciation and amortization	10.1	12.2	21.9	23.7
Effect of LIFO liquidation and Inventory write-down	4.2	(0.4)	(18.0)	5.3
Gain on sale of unconsolidated affiliate				(1.2)
Unrealized (gain) loss on derivatives	(0.4)	(7.6)	0.1	(8.1)
Interest expense	0.0	0.0	0.0	0.0
(Gain) loss on debt extinguishment		0.0		0.0
Loss on impairment and disposal of assets	0.0	0.0	1.5	0.0
Operating Segments [Member] | Specialty Product [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Sales	232.7	344.4	559.6	696.6
Operating Segments [Member] | Specialty Product [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	11.2	24.4	28.6	47.2
Operating Segments [Member] | Fuel Product [Member]
Segment Reporting Information [Line Items]
Sales	225.8	564.9	599.5	1,075.0
Gain (loss) from unconsolidated affiliates				0.0
Adjusted EBITDA	1.9	50.2	41.1	76.1
Reconciling items to net loss:
Depreciation and amortization	17.8	18.5	35.6	38.2
Effect of LIFO liquidation and Inventory write-down	27.9	3.0	(16.4)	35.3
Gain on sale of unconsolidated affiliate				0.0
Unrealized (gain) loss on derivatives	1.6	(4.6)	30.3	(6.7)
Interest expense		4.3		7.1
Interest Income, Other	(0.4)		(2.1)
(Gain) loss on debt extinguishment		0.0		0.0
Loss on impairment and disposal of assets	0.1	0.1	0.1	11.8
Operating Segments [Member] | Fuel Product [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Sales	221.0	552.5	586.7	1,051.6
Operating Segments [Member] | Fuel Product [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	4.8	12.4	12.8	23.4
Operating Segments [Member] | Corporate Segment [Member]
Segment Reporting Information [Line Items]
Sales	0.0	0.0	0.0	0.0
Gain (loss) from unconsolidated affiliates				0.0
Adjusted EBITDA	(17.0)	(28.3)	(37.0)	(52.9)
Reconciling items to net loss:
Depreciation and amortization	1.9	1.9	3.8	3.7
Effect of LIFO liquidation and Inventory write-down	0.0	0.0	0.0	0.0
Gain on sale of unconsolidated affiliate				0.0
Unrealized (gain) loss on derivatives	0.0	0.0	0.0	0.0
Interest expense	31.0	28.8	62.0	58.3
(Gain) loss on debt extinguishment		0.3		0.7
Loss on impairment and disposal of assets	0.6	16.1	5.1	16.1
Operating Segments [Member] | Corporate Segment [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Sales	0.0	0.0	0.0	0.0
Operating Segments [Member] | Corporate Segment [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	0.0	0.0	0.0	0.0
Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(16.0)
Reconciling items to net loss:
Depreciation and amortization	0.0
Effect of LIFO liquidation and Inventory write-down	0.0
Unrealized (gain) loss on derivatives	0.0
Interest expense	0.0
Loss on impairment and disposal of assets	0.0
Eliminations [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Sales	0.0
Eliminations [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(16.0)
Eliminations [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales		(36.8)	(41.4)	(70.6)
Gain (loss) from unconsolidated affiliates				0.0
Adjusted EBITDA	0.0	0.0	0.0	0.0
Reconciling items to net loss:
Depreciation and amortization		0.0	0.0	0.0
Effect of LIFO liquidation and Inventory write-down		0.0	0.0	0.0
Gain on sale of unconsolidated affiliate				0.0
Unrealized (gain) loss on derivatives		0.0	0.0	0.0
Interest expense		0.0	0.0	0.0
(Gain) loss on debt extinguishment		0.0		0.0
Loss on impairment and disposal of assets		0.0	0.0	0.0
Eliminations [Member] | Eliminations [Member] | External Customers [Member]
Segment Reporting Information [Line Items]
Sales		0.0	0.0	0.0
Eliminations [Member] | Eliminations [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Sales		(36.8)	(41.4)	(70.6)
Oil and Gas, Refining and Marketing [Member]
Segment Reporting Information [Line Items]
Sales	$ 453.7	$ 896.9	$ 1,146.3	$ 1,748.2