Fair Value Measurements - Carrying Value (Details) - CALUMET SPECIALTY PRODUCTS PARTNERS, L.P. - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
MRL term loan credit agreement	$ 74.1	$ 74.4
Shreveport terminal asset financing arrangement	46.9	50.8
MRL asset financing arrangements	376.6	384.6
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes payable, fair value disclosure	1,181.4	1,247.2
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Revolving credit facility	315.1	136.7
MRL revolving credit agreement	6.4	13.0
MRL term loan credit agreement	74.1	74.4
Shreveport terminal asset financing arrangement	46.9	50.8
MRL asset financing arrangements	376.6	384.6
Finance leases and other obligations	2.5	3.0
Carrying Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notes payable, fair value disclosure	1,204.4	1,232.3
Carrying Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Revolving credit facility	311.3	134.4
MRL revolving credit agreement	5.8	12.4
MRL term loan credit agreement	71.6	71.6
Shreveport terminal asset financing arrangement	46.3	50.1
MRL asset financing arrangements	373.6	381.6
Finance leases and other obligations	$ 2.5	$ 3.0