| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | -18.3 | -10.5 | -5.5 | -6.5 | -3.1 | -57.2 | -0.4 |
| Depreciation and amortization | 1.6 | 1.6 | 1.7 | 1.6 | 0.7 | 65.9 | |
| Asset impairment charges | 8.3 | | | | | | |
| Stock-based compensation | 0.4 | 0.6 | 0.4 | 0.4 | 0.0 | | |
| Change in working capital [+] | -2.3 | 0.4 | -1.3 | 0.7 | 1.0 | 326.8 | -0.3 |
| Accounts receivable | -1.7 | 0.3 | -0.2 | -0.4 | -0.2 | 208.4 | -0.3 |
| Other current assets | 0.2 | -0.2 | 0.2 | -0.3 | -0.1 | | 0.0 |
| Other | -0.8 | 0.3 | -1.3 | 1.4 | 1.2 | 118.4 | 0.0 |
| Other operating activities | -0.1 | 0.3 | -1.2 | -0.2 | -0.4 | -772.5 | -0.2 |
| Cash from operations | -10.3 | -7.6 | -6.0 | -4.1 | -1.8 | -437.0 | -0.9 |
| |
| Capital expenditures [+] | -0.3 | -0.7 | -0.1 | -1.2 | -1.6 | -472.5 | 0.0 |
| Purchases of property and equipment | -0.3 | -0.7 | -0.1 | -1.2 | -1.6 | -472.5 | |
| Sales of property and equipment | 0.1 | 0.0 | | 0.1 | | | |
| Acquisitions | | -1.7 | -0.2 | | 0.0 | | |
| Other cash from investing | | -0.1 | -0.2 | | | | -0.4 |
| Cash from investing | -0.3 | -2.5 | -0.6 | -1.1 | -1.6 | -472.5 | -0.4 |
| |
| Issuance of common stock, net | 4.5 | 19.0 | 5.2 | 5.2 | | | |
| Financing costs | | | -0.2 | | | | |
| Other cash from financing | -0.3 | -4.5 | 3.5 | 0.2 | 3.5 | 161.1 | 2.2 |
| Cash from financing | 4.2 | 14.5 | 8.8 | 5.3 | 3.5 | 161.1 | 2.2 |
| |
| Free cash flow | -10.6 | -8.3 | -6.1 | -5.3 | -3.4 | -909.5 | -0.9 |
| Per share (diluted) | ($0.38) | ($0.37) | ($0.55) | ($0.68) | ($0.75) | ($0.14) | |
| |
| Cash paid for interest | 0.0 | 0.2 | 0.1 | 0.1 | 0.2 | 27.2 | |
| Cash paid for income taxes | | | | 0.0 | | | |