v3.26.1
Segment Information - Summary of Results of Segment Operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenues from external customers:        
Cost of sales $ 411.1 $ 390.6 $ 779.8 $ 741.3
Selling, general and administrative expenses: 40.9 39.5 82.6 80.6
Other (income) expense to reconcile to Adjusted EBITDA (2.9) (2.4) (7.3) 6.8
Adjusted EBITDA:        
Adjusted EBITDA: 71.0 77.1 120.3 132.6
Items excluded from the determination of segment profit:        
Acquisition inventory step-up amortization (0.5) (0.0) (0.8) (0.0)
Amortization of cloud-based software implementation costs (0.7) (0.5) (1.2) (0.8)
(Loss) gain on sale of assets (0.4) 0.0 3.9 0.3
Impairment, restructuring and plant closure costs (215.8) (17.6) (223.6) (37.6)
LIFO benefit 2.3 0.7 3.5 2.5
Mark-to-market commodity hedging (losses) gains (3.0) 0.7 (6.9) 9.8
Pension settlement and expense (0.0) (1.2) (0.0) (30.2)
Depreciation and amortization (17.9) (18.0) (37.3) (36.0)
Interest expense (15.0) (17.3) (30.0) (33.9)
Income tax benefit (provision) 32.5 (7.5) 31.7 (4.2)
Net (loss) income (147.5) 16.4 (140.4) 2.5
Intersegment revenues: (520.1) (504.8) (975.4) (961.3)
Depreciation and amortization expense: 17.9 18.0 37.3 36.0
Capital expenditures: 12.3 12.1 23.7 26.4
Operating Segments        
Items excluded from the determination of segment profit:        
Intersegment revenues: (520.1) (504.8) (975.4) (961.3)
Intersegment revenues:        
Items excluded from the determination of segment profit:        
Intersegment revenues: 36.6 31.1 66.9 60.2
Corporate        
Items excluded from the determination of segment profit:        
Capital expenditures: 0.3 0.3 0.5 1.0
Railroad and Utility Products and Services        
Revenues from external customers:        
Cost of sales 204.2 201.8 380.2 392.5
Selling, general and administrative expenses: 17.2 17.1 35.5 35.3
Other (income) expense to reconcile to Adjusted EBITDA (1.2) (0.1) 1.9 0.5
Adjusted EBITDA:        
Adjusted EBITDA: 25.7 31.6 48.3 57.1
Items excluded from the determination of segment profit:        
Depreciation and amortization expense: 8.2 8.5 16.4 17.0
Railroad and Utility Products and Services | Operating Segments        
Adjusted EBITDA:        
Adjusted EBITDA: 25.7 31.6 48.3 57.1
Items excluded from the determination of segment profit:        
Intersegment revenues: (245.9) (250.4) (465.9) (485.4)
Capital expenditures: 5.1 4.2 10.5 9.3
Performance Chemicals        
Revenues from external customers:        
Cost of sales 119.3 108.6 229.5 187.6
Selling, general and administrative expenses: 14.7 15.4 29.6 30.5
Other (income) expense to reconcile to Adjusted EBITDA (3.5) (1.9) (12.3) 4.8
Adjusted EBITDA:        
Adjusted EBITDA: 37.7 28.7 63.5 48.8
Items excluded from the determination of segment profit:        
Depreciation and amortization expense: 4.0 4.1 8.3 7.9
Performance Chemicals | Operating Segments        
Adjusted EBITDA:        
Adjusted EBITDA: 37.7 28.7 63.5 48.8
Items excluded from the determination of segment profit:        
Capital expenditures: 4.0 2.4 6.8 5.9
Performance Chemicals | Intersegment revenues:        
Items excluded from the determination of segment profit:        
Intersegment revenues: 8.5 7.9 15.7 14.8
Carbon Materials and Chemicals        
Revenues from external customers:        
Cost of sales 87.6 80.2 170.1 161.2
Selling, general and administrative expenses: 9.0 7.0 17.5 14.8
Other (income) expense to reconcile to Adjusted EBITDA 1.8 (0.4) 3.1 1.5
Adjusted EBITDA:        
Adjusted EBITDA: 7.6 16.8 8.5 26.7
Items excluded from the determination of segment profit:        
Depreciation and amortization expense: 5.7 5.4 12.6 11.1
Carbon Materials and Chemicals | Operating Segments        
Adjusted EBITDA:        
Adjusted EBITDA: 7.6 16.8 8.5 26.7
Items excluded from the determination of segment profit:        
Intersegment revenues: (106.0) (103.6) (199.2) (204.2)
Capital expenditures: 2.9 5.2 5.9 10.2
Carbon Materials and Chemicals | Intersegment revenues:        
Items excluded from the determination of segment profit:        
Intersegment revenues: $ 28.1 $ 23.2 $ 51.2 $ 45.4