| In millions, except per share items | Dec-31-22 | Dec-05-22 | Dec-31-21 | Dec-05-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 8-K | 10-K | 8-K | 10-K | 10-K | 10-K | 10-K |
| Revenues |
| Railroad and Utility Products and Services | | | | | | 733.5 | 634.8 | 512.6 |
| Carbon Materials & Chemicals | | | | | | 455.2 | 507.9 | 551.7 |
| Performance Chemicals | | | | | | 448.3 | 420.0 | 411.2 |
| |
| EBITDA |
| Railroad and Utility Products and Services | | | | | | 19.4 | 23.6 | 38.0 |
| Carbon Materials & Chemicals | | | | | | 13.7 | 56.1 | 48.1 |
| Performance Chemicals | | | | | | 18.3 | 54.0 | 89.3 |
| Corporate | | | | | | | -2.4 | -2.0 |
| |
| EBIT |
| Railroad and Utility Products and Services | | | | | | | 5.9 | 26.2 |
| Carbon Materials & Chemicals | | | | | | | 44.7 | 28.0 |
| Performance Chemicals | | | | | | | 36.2 | 71.4 |
| Corporate | | | | | | | -2.4 | -2.0 |
| |
| Mix |
| Railroad and Utility Products and Services | | | | | | 44.8% | 40.6% | 34.7% |
| Carbon Materials & Chemicals | | | | | | 27.8% | 32.5% | 37.4% |
| Performance Chemicals | | | | | | 27.4% | 26.9% | 27.9% |
| |
| Growth |
| Railroad and Utility Products and Services | | | | | | 15.5% | 23.8% | |
| Carbon Materials & Chemicals | | | | | | -10.4% | -7.9% | |
| Performance Chemicals | | | | | | 6.7% | 2.1% | |