v3.26.1
Segments and Related Information - Schedule of Product Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Major product category sales        
Sales $ 1,445.1 $ 1,026.6 $ 2,474.9 $ 2,020.5
Product Concentration Risk | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 1,445.1 $ 1,026.6 $ 2,474.9 $ 2,020.5
Concentration risk, percentage 100.00% 100.00% 100.00% 100.00%
Product Concentration Risk | Specialty Products and Solutions | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 1,012.5 $ 627.9 $ 1,717.5 $ 1,278.0
Concentration risk, percentage 70.00% 61.10% 69.40% 63.20%
Product Concentration Risk | Montana/ Renewables | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 329.0 $ 318.0 $ 564.9 $ 579.7
Concentration risk, percentage 22.80% 30.90% 22.80% 28.70%
Product Concentration Risk | Performance Brands | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 103.6 $ 80.7 $ 192.5 $ 162.8
Concentration risk, percentage 7.20% 8.00% 7.80% 8.10%
Lubricating oils | Product Concentration Risk | Specialty Products and Solutions | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 281.0 $ 190.3 $ 472.8 $ 392.5
Concentration risk, percentage 19.40% 18.50% 19.10% 19.40%
Solvents | Product Concentration Risk | Specialty Products and Solutions | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 153.2 $ 101.5 $ 261.1 $ 206.2
Concentration risk, percentage 10.60% 9.90% 10.50% 10.20%
Waxes | Product Concentration Risk | Specialty Products and Solutions | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 40.9 $ 40.2 $ 80.7 $ 78.4
Concentration risk, percentage 2.80% 3.90% 3.30% 3.90%
Fuels, asphalt and other by-products | Product Concentration Risk | Specialty Products and Solutions | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 537.4 $ 295.9 $ 902.9 $ 600.9
Concentration risk, percentage 37.20% 28.80% 36.50% 29.70%
Fuels, asphalt and other by-products | Product Concentration Risk | Montana/ Renewables | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 145.8 $ 109.2 $ 239.5 $ 205.3
Concentration risk, percentage 10.10% 10.60% 9.70% 10.20%
Renewable fuels | Product Concentration Risk | Montana/ Renewables | Revenue from Contract with Customer Benchmark        
Major product category sales        
Sales $ 183.2 $ 208.8 $ 325.4 $ 374.4
Concentration risk, percentage 12.70% 20.30% 13.10% 18.50%