| In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -19.1 | -5.0 | 4.8 | -9.4 | 2.0 | 9.5 | -19.7 | -4.7 |
| Depreciation and amortization | 11.0 | 9.6 | 9.5 | 6.9 | 5.2 | 5.4 | 6.5 | 7.3 |
| Asset impairment charges | | | | | | 3.7 | 2.9 | |
| Stock-based compensation | | | 1.0 | 1.2 | 0.3 | 0.3 | 0.0 | 0.0 |
| Deferred taxes | | | 0.3 | -0.7 | | | | |
| Change in working capital | -0.4 | -0.6 | -1.7 | 2.5 | -0.4 | -0.8 | -0.9 | -0.3 |
| Other | -0.4 | -0.6 | -1.7 | 2.5 | -0.4 | -0.8 | -0.9 | -0.3 |
| Other operating activities | 7.8 | 5.4 | -3.2 | 9.0 | -4.3 | -13.1 | 16.6 | -0.3 |
| Cash from operations | -0.8 | 9.3 | 10.7 | 9.6 | 2.8 | 5.0 | 5.5 | 2.0 |
| |
| Capital expenditures [+] | 0.6 | 1.5 | -2.0 | -2.8 | -3.4 | -3.9 | -3.0 | -5.1 |
| Purchases of property and equipment | 0.6 | 1.5 | -2.0 | -2.8 | -3.4 | -3.9 | -3.0 | -5.1 |
| Sales of property and equipment | 0.0 | 4.2 | 19.7 | 27.6 | 58.6 | 53.3 | 21.3 | 20.7 |
| Other cash from investing | -7.9 | -1.3 | -34.2 | -121.7 | -31.7 | -44.1 | -0.3 | |
| Cash from investing | -7.3 | 4.4 | -16.5 | -96.8 | 23.4 | 5.4 | 17.9 | 15.6 |
| |
| Cash dividends paid | | 9.3 | -9.3 | -6.9 | -0.2 | | | |
| Issuance of common stock, net | | | 0.3 | 47.5 | | 0.3 | 0.9 | |
| Financing costs | | | -0.1 | -4.4 | -0.1 | -0.9 | -0.5 | -1.1 |
| Other cash from financing | 7.2 | -23.7 | 13.5 | 38.9 | -21.1 | -6.9 | -24.7 | -19.6 |
| Cash from financing | 7.2 | -14.4 | 4.6 | 83.9 | -21.2 | -5.7 | -23.3 | -18.5 |
| |
| Free cash flow | -0.2 | 10.7 | 8.7 | 6.8 | -0.7 | 1.1 | 2.5 | -3.1 |
| Per share (diluted) | ($0.02) | $0.90 | $0.73 | $0.72 | ($0.12) | $0.31 | $0.63 | ($1.08) |
| |
| Cash paid for interest | 7.3 | 6.7 | 6.1 | 3.9 | 4.2 | 5.1 | 7.1 | 8.5 |
| Cash paid for income taxes | | | 0.0 | 0.2 | | | | |