Unrestricted Subsidiaries - Schedule of Financial Information (Details) - CALUMET SPECIALTY PRODUCTS PARTNERS, L.P. - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments
Cash and cash equivalents	$ 7.0		$ 7.9	$ 36.0
Accounts receivable - trade	306.9		252.4
Accounts receivable - other	32.7		33.8
Inventory	394.8		439.4
Prepaid expenses and other current assets	50.5		51.6
Property, plant and equipment, net	1,467.2		1,506.3	1,536.4
Other noncurrent assets, net	408.1		450.3
Accounts payable	342.3		322.0
Accrued interest payable	49.5		48.7
Obligations under inventory financing agreements	34.9		190.4
Other current liabilities	97.1		131.5
Current portion of long-term debt	390.4		55.7
Other long-term liabilities	146.5		53.6
Long-term debt	1,625.1		1,829.7
Redeemable noncontrolling interest	245.6		245.6
Partners' capital (deficit)	(566.4)	$ (529.7)	(490.3)	$ (543.4)	$ (523.3)	$ (533.3)
Eliminations
Schedule of Equity Method Investments
Cash and cash equivalents	0.0		0.0
Accounts receivable - trade	0.0		0.0
Accounts receivable - other	0.0		0.0
Inventory	0.0		0.0
Prepaid expenses and other current assets	0.0		0.0
Property, plant and equipment, net	0.0		0.0
Other noncurrent assets, net	0.0		0.0
Accounts payable	(384.6)		(293.7)
Accrued interest payable	0.0		0.0
Obligations under inventory financing agreements	0.0		0.0
Other current liabilities	0.0		0.0
Current portion of long-term debt	0.0		0.0
Other long-term liabilities	0.0		0.0
Long-term debt	(98.5)		(100.0)
Redeemable noncontrolling interest	0.0		0.0
Partners' capital (deficit)	(18.8)		(18.8)
Parent Company and Restricted Subsidiaries
Schedule of Equity Method Investments
Cash and cash equivalents	6.4		7.3
Accounts receivable - trade	276.3		230.7
Accounts receivable - other	19.6		24.8
Inventory	350.3		353.1
Prepaid expenses and other current assets	27.4		14.6
Property, plant and equipment, net	715.2		731.7
Other noncurrent assets, net	395.5		436.9
Accounts payable	305.5		282.4
Accrued interest payable	48.3		47.8
Obligations under inventory financing agreements	0.0		126.0
Other current liabilities	91.9		104.5
Current portion of long-term debt	372.5		38.8
Other long-term liabilities	144.6		50.6
Long-term debt	1,191.8		1,381.0
Redeemable noncontrolling interest	0.0		0.0
Partners' capital (deficit)	(164.2)		(174.3)
Unrestricted Subsidiaries
Schedule of Equity Method Investments
Cash and cash equivalents	0.6		0.6
Accounts receivable - trade	30.6		21.7
Accounts receivable - other	13.1		9.0
Inventory	44.5		86.3
Prepaid expenses and other current assets	23.1		37.0
Property, plant and equipment, net	752.0		774.6
Other noncurrent assets, net	12.6		13.4
Accounts payable	421.4		333.3
Accrued interest payable	1.2		0.9
Obligations under inventory financing agreements	34.9		64.4
Other current liabilities	5.2		27.0
Current portion of long-term debt	17.9		16.9
Other long-term liabilities	1.9		3.0
Long-term debt	531.8		548.7
Redeemable noncontrolling interest	245.6		245.6
Partners' capital (deficit)	$ (383.4)		$ (297.2)