Segments and Related Information - Schedule of Product Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Major product category sales
Sales	$ 993.9	$ 1,005.8
Product Concentration Risk | Sales
Major product category sales
Sales	$ 993.9	$ 1,005.8
Concentration risk, percentage	100.00%	100.00%
Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 650.1	$ 681.6
Concentration risk, percentage	65.30%	67.80%
Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 261.7	$ 244.5
Concentration risk, percentage	26.40%	24.30%
Product Concentration Risk | Performance Brands | Sales
Major product category sales
Sales	$ 82.1	$ 79.7
Concentration risk, percentage	8.30%	7.90%
Lubricating oils | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 202.2	$ 189.7
Concentration risk, percentage	20.30%	18.90%
Solvents | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 104.7	$ 102.4
Concentration risk, percentage	10.50%	10.20%
Waxes | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 38.2	$ 39.0
Concentration risk, percentage	3.80%	3.90%
Fuels, asphalt and other by-products | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 305.0	$ 350.5
Concentration risk, percentage	30.70%	34.80%
Gasoline | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 32.5	$ 31.6
Concentration risk, percentage	3.30%	3.10%
Diesel | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 23.4	$ 27.9
Concentration risk, percentage	2.40%	2.80%
Jet fuel | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 4.2	$ 4.6
Concentration risk, percentage	0.40%	0.50%
Asphalt, heavy fuel oils and other | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 36.0	$ 30.1
Concentration risk, percentage	3.60%	3.00%
Renewable fuels | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 165.6	$ 150.3
Concentration risk, percentage	16.70%	14.90%