Inventories - Summary of Inventories (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	Dec. 31, 2023
Inventories
Raw materials		$ 84.0		$ 84.0		$ 89.2
Work in process		91.1		91.1		109.0
Finished goods		219.7		219.7		241.2
Total Inventories		394.8		394.8		439.4
Lower of cost or market inventory adjustment		9.5	$ 5.8	0.5	$ (13.9)
Titled Inventory
Inventories
Raw materials		40.4		40.4		61.6
Work in process		64.1		64.1		72.3
Finished goods		150.7		150.7		162.1
Total Inventories		255.2		255.2		296.0
Supply & Offtake Agreements
Inventories
Raw materials	[1]	43.6		43.6		27.6
Work in process	[1]	27.0		27.0		36.7
Finished goods	[1]	69.0		69.0		79.1
Total Inventories	[1]	$ 139.6		$ 139.6		$ 143.4

[1] Amounts represent LIFO value and do not necessarily represent the value at which the inventory was sold. Please read Note 7 — “Inventory Financing Agreements” for further information.