| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K | 10-K |
| Net income | -153.4 | -96.0 | 324.1 | -14.1 |
| Depreciation and amortization | 1.2 | 0.9 | 0.9 | 1.0 |
| Asset impairment charges | 5.6 | 2.3 | | |
| Stock-based compensation | 7.0 | 4.9 | 0.3 | 0.1 |
| Change in working capital [+] | 26.9 | 28.8 | 7.5 | 2.1 |
| Accounts receivable | -1.2 | 0.0 | 0.1 | 0.0 |
| Inventories | -5.6 | -2.3 | -0.1 | |
| Other current assets | -0.6 | -0.5 | -8.2 | 0.0 |
| Accounts payable | -4.7 | 5.3 | 0.7 | -0.7 |
| Accrued expenses | 4.6 | 2.2 | 5.8 | 0.0 |
| Other | 34.3 | 24.1 | 9.2 | 2.8 |
| Other operating activities | -4.3 | -21.4 | -355.7 | -0.2 |
| Cash from operations | -116.9 | -80.5 | -22.9 | -11.1 |
| |
| Capital expenditures [+] | -2.9 | -2.4 | -0.3 | -0.3 |
| Purchases of property and equipment | -2.9 | -2.4 | -0.3 | -0.3 |
| Sales of property and equipment | 0.2 | 0.0 | 0.0 | |
| Sales of short-term investments | 263.7 | 254.2 | | |
| Sales of short-term investments | 263.7 | 254.2 | | |
| Other cash from investing | -283.0 | -317.8 | -237.9 | |
| Cash from investing | -22.0 | -66.0 | -238.1 | -0.3 |
| |
| Option exercises | 0.1 | 0.6 | 0.1 | 0.0 |
| Other cash from financing | 0.0 | 16.5 | 644.6 | 16.6 |
| Cash from financing | -0.1 | 15.9 | 644.5 | 16.6 |
| |
| Free cash flow | -119.8 | -82.9 | -23.3 | -11.4 |
| Per share (diluted) | ($0.68) | ($0.48) | ($0.21) | ($0.13) |
| |