Segments and Related Information - Schedule of Product Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Major product category sales
Sales	$ 1,100.4	$ 1,149.4	$ 3,239.9	$ 3,204.5
Product Concentration Risk | Sales
Major product category sales
Sales	$ 1,100.4	$ 1,149.4	$ 3,239.9	$ 3,204.5
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 714.0	$ 745.7	$ 2,141.8	$ 2,168.5
Concentration risk, percentage	64.90%	64.90%	66.10%	67.70%
Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 306.1	$ 328.5	$ 842.0	$ 796.5
Concentration risk, percentage	27.80%	28.60%	26.00%	24.80%
Product Concentration Risk | Performance Brands | Sales
Major product category sales
Sales	$ 80.3	$ 75.2	$ 256.1	$ 239.5
Concentration risk, percentage	7.30%	6.50%	7.90%	7.50%
Lubricating oils | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 192.5	$ 175.8	$ 598.1	$ 577.2
Concentration risk, percentage	17.50%	15.30%	18.50%	18.00%
Solvents | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 106.1	$ 92.1	$ 318.0	$ 294.9
Concentration risk, percentage	9.60%	8.00%	9.80%	9.20%
Waxes | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 38.8	$ 40.1	$ 117.9	$ 124.5
Concentration risk, percentage	3.50%	3.50%	3.60%	3.90%
Fuels, asphalt and other by-products | Product Concentration Risk | Specialty Products and Solutions | Sales
Major product category sales
Sales	$ 376.6	$ 437.7	$ 1,107.8	$ 1,171.9
Concentration risk, percentage	34.30%	38.10%	34.20%	36.60%
Gasoline | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 40.8	$ 47.9	$ 110.0	$ 131.6
Concentration risk, percentage	3.70%	4.20%	3.40%	4.10%
Diesel | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 31.0	$ 39.9	$ 87.9	$ 108.7
Concentration risk, percentage	2.80%	3.50%	2.70%	3.40%
Jet fuel | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 5.3	$ 5.9	$ 14.8	$ 16.5
Concentration risk, percentage	0.50%	0.50%	0.50%	0.50%
Asphalt, heavy fuel oils and other | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 51.3	$ 50.2	$ 118.5	$ 108.3
Concentration risk, percentage	4.70%	4.30%	3.70%	3.30%
Renewable fuels | Product Concentration Risk | Montana/Renewables | Sales
Major product category sales
Sales	$ 177.7	$ 184.6	$ 510.8	$ 431.4
Concentration risk, percentage	16.10%	16.10%	15.70%	13.50%