Segments and Related Information - Schedule of Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Segments and Related Information
Number of reportable segments not disclosed flag	true
Reportable segment information
Sales	$ 993.9	$ 1,005.8
Cost of sales	1,075.3	927.3
Gross profit (loss)	(81.4)	78.5
Adjusted EBITDA	38.1	28.1
Reconciling items to net loss:
Depreciation and amortization	46.7	45.4
LCM / LIFO (gain) loss	(0.1)	9.0
(Gain) loss on sale of business	(62.2)
Interest expense	58.5	60.8
Debt extinguishment costs	47.6	0.2
Unrealized gain on derivatives	(0.1)	(35.7)
RINs incurrence expense	30.4	6.5
RINs mark-to-market loss	86.8	(71.1)
Other non-recurring expenses (income)	3.2	60.8
Equity-based compensation and other items	(13.5)	(7.3)
Income tax expense	0.4	0.2
Noncontrolling interest adjustments	2.4	0.9
Net income (loss)	(162.0)	(41.6)
Capital expenditures	20.4	25.5
PP&E, net	1,412.9	1,486.0	$ 1,438.8
Realized loss on derivatives related to the embedded derivatives		51.9
External customers
Reportable segment information
Sales	993.9	1,005.8
Eliminations
Reportable segment information
Sales	(4.8)	(5.1)
Eliminations | Inter-segment sales
Reportable segment information
Sales	(4.8)	(5.1)
Specialty Products and Solutions
Reportable segment information
Cost of sales	684.1	596.3
Gross profit (loss)	(34.0)	85.3
Reconciling items to net loss:
Capital expenditures	12.0	14.1
PP&E, net	344.4	368.5
Specialty Products and Solutions | Operating Segments
Reportable segment information
Sales	654.9	686.6
Adjusted EBITDA	56.3	47.2
Reconciling items to net loss:
Depreciation and amortization	16.7	17.6
LCM / LIFO (gain) loss	(0.7)	(3.6)
Interest expense	4.6	7.8
Unrealized gain on derivatives	(0.1)	(35.7)
RINs incurrence expense	22.3	5.4
RINs mark-to-market loss	60.7	(47.9)
Specialty Products and Solutions | Operating Segments | External customers
Reportable segment information
Sales	650.1	681.6
Specialty Products and Solutions | Operating Segments | Inter-segment sales
Reportable segment information
Sales	4.8	5.0
Performance Brands
Reportable segment information
Cost of sales	59.9	57.4
Gross profit (loss)	22.2	22.3
Reconciling items to net loss:
Capital expenditures	0.2	0.3
PP&E, net	31.0	32.9
Performance Brands | Operating Segments
Reportable segment information
Sales	82.1	79.8
Adjusted EBITDA	15.8	13.4
Reconciling items to net loss:
Depreciation and amortization	1.9	2.1
LCM / LIFO (gain) loss	1.3	0.2
(Gain) loss on sale of business	(64.4)
Performance Brands | Operating Segments | External customers
Reportable segment information
Sales	82.1	79.7
Performance Brands | Operating Segments | Inter-segment sales
Reportable segment information
Sales		0.1
Montana/Renewables
Reportable segment information
Cost of sales	331.3	273.6
Gross profit (loss)	(69.6)	(29.1)
Reconciling items to net loss:
Capital expenditures	7.9	11.0
PP&E, net	1,032.6	1,082.9
Montana/Renewables | Operating Segments
Reportable segment information
Sales	261.7	244.5
Adjusted EBITDA	(13.6)	(13.4)
Reconciling items to net loss:
Depreciation and amortization	27.9	25.4
LCM / LIFO (gain) loss	(0.7)	12.4
Interest expense	18.3	17.0
Debt extinguishment costs	47.6
RINs incurrence expense	8.1	1.1
RINs mark-to-market loss	26.1	(23.2)
Montana/Renewables | Operating Segments | External customers
Reportable segment information
Sales	261.7	244.5
Corporate
Reconciling items to net loss:
Capital expenditures	0.3	0.1
PP&E, net	4.9	1.7
Corporate | Operating Segments
Reportable segment information
Adjusted EBITDA	(20.4)	(19.1)
Reconciling items to net loss:
Depreciation and amortization	0.2	0.3
(Gain) loss on sale of business	2.2
Interest expense	$ 35.6	36.0
Debt extinguishment costs		$ 0.2