Fair Value Measurements - Recurring Measurements (Details) - CALUMET SPECIALTY PRODUCTS PARTNERS, L.P. - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets:
Derivative assets	$ 3.7	$ 9.6
Derivative liabilities:
Total derivative liabilities	(6.1)	(52.5)
Fair Value, Measurements, Recurring
Assets:
Derivative assets	3.7	11.6
Pension plan investments	26.3	27.0
Total recurring assets at fair value	30.0	38.6
Derivative liabilities:
Total derivative liabilities	(6.1)	(52.5)
Precious metals obligations	(5.7)	(6.9)
Liability awards	(47.0)	(64.2)
Total recurring liabilities at fair value	(58.8)	(123.6)
Fair Value, Measurements, Recurring | Inventory Financing Obligations
Derivative liabilities:
Total derivative liabilities	(6.1)	(52.5)
Fair Value, Measurements, Recurring | Crack Spread Swaps
Assets:
Derivative assets	3.7	11.6
Fair Value, Measurements, Recurring | Level 1
Assets:
Derivative assets	0.0	0.0
Pension plan investments	3.6	3.5
Total recurring assets at fair value	3.6	3.5
Derivative liabilities:
Total derivative liabilities	0.0	0.0
Precious metals obligations	(5.7)	(6.9)
Liability awards	(47.0)	(64.2)
Total recurring liabilities at fair value	(52.7)	(71.1)
Fair Value, Measurements, Recurring | Level 1 | Inventory Financing Obligations
Derivative liabilities:
Total derivative liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Level 1 | Crack Spread Swaps
Assets:
Derivative assets	0.0	0.0
Fair Value, Measurements, Recurring | Level 2
Assets:
Derivative assets	0.0	0.0
Pension plan investments	22.7	23.5
Total recurring assets at fair value	22.7	23.5
Derivative liabilities:
Total derivative liabilities	0.0	0.0
Precious metals obligations	0.0	0.0
Liability awards	0.0	0.0
Total recurring liabilities at fair value	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Inventory Financing Obligations
Derivative liabilities:
Total derivative liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Level 2 | Crack Spread Swaps
Assets:
Derivative assets	0.0	0.0
Fair Value, Measurements, Recurring | Level 3
Assets:
Derivative assets	3.7	11.6
Pension plan investments	0.0	0.0
Total recurring assets at fair value	3.7	11.6
Derivative liabilities:
Total derivative liabilities	(6.1)	(52.5)
Precious metals obligations	0.0	0.0
Liability awards	0.0	0.0
Total recurring liabilities at fair value	(6.1)	(52.5)
Fair Value, Measurements, Recurring | Level 3 | Inventory Financing Obligations
Derivative liabilities:
Total derivative liabilities	(6.1)	(52.5)
Fair Value, Measurements, Recurring | Level 3 | Crack Spread Swaps
Assets:
Derivative assets	$ 3.7	$ 11.6