Unrestricted Subsidiaries - Income statement information (Details) - CALUMET SPECIALTY PRODUCTS PARTNERS, L.P. - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Schedule of Equity Method Investments
Sales	$ 1,133.7	$ 1,017.8	$ 2,139.5	$ 2,055.1
Cost of sales	1,069.9	946.3	1,997.2	1,887.0
Gross profit	63.8	71.5	142.3	168.1
Operating costs and expenses:
General and administrative	37.5	25.7	60.8	62.8
Other operating expense	5.0	5.2	10.2	8.2
Operating income	6.2	25.1	42.5	68.1
Other income (expense):
Interest expense	(56.8)	(55.8)	(117.6)	(105.0)
Debt extinguishment costs	(0.1)	(5.2)	(0.3)	(5.2)
Gain (loss) on derivative instruments	11.3	14.3	(5.6)	39.8
Other income (expense)	0.7	(5.5)	0.7	(5.7)
Total other expense	(44.8)	(47.0)	(122.5)	(70.9)
Net loss	(39.1)	(22.3)	(80.7)	(3.7)
Unrestricted Subsidiaries
Schedule of Equity Method Investments
Sales	182.9	128.2	333.2	246.8
Cost of sales	179.2	136.6	363.2	307.2
Gross profit	3.7	(8.4)	(30.0)	(60.4)
Operating costs and expenses:
General and administrative	6.9	5.6	13.4	9.3
Other operating expense	1.3	0.8	2.8	3.8
Operating income	(4.5)	(14.8)	(46.2)	(73.5)
Other income (expense):
Interest expense	(21.9)	(23.9)	(46.5)	(36.9)
Gain (loss) on derivative instruments	3.5	(2.9)	5.9	1.3
Other income (expense)	0.2	0.1	0.5	0.1
Total other expense	(18.2)	(26.7)	(40.1)	(35.5)
Net loss	$ (22.7)	$ (41.5)	$ (86.3)	$ (109.0)