| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 |
| | 10-K | 10-K | 10-K | S-1/A |
| Net income | -247.4 | -192.5 | -228.8 | -0.1 |
| Depreciation and amortization | 1.4 | 1.4 | 4.7 | 6.1 |
| Asset impairment charges | | | 0.5 | 0.9 |
| Stock-based compensation | | | 2.4 | 2.3 |
| Deferred taxes | | | | 6.2 |
| Change in working capital [+] | -4.7 | -56.4 | 15.5 | 46.2 |
| Accounts receivable | | | 3.4 | 0.6 |
| Inventories | | | -3.9 | -3.5 |
| Other current assets | | | -3.9 | -1.7 |
| Accounts payable | | | 4.4 | 5.8 |
| Accrued expenses | -22.9 | -61.8 | 18.0 | |
| Other | 18.2 | 5.4 | -2.6 | 45.0 |
| Other operating activities | 110.3 | 154.5 | 99.6 | -126.7 |
| Cash from operations | -140.3 | -93.0 | -106.1 | -65.1 |
| |
| Capital expenditures | 0.9 | 3.9 | -3.7 | -4.8 |
| Purchases of property and equipment | 0.9 | 3.9 | -3.7 | -4.8 |
| Sales of short-term investments, net [+] | | | 20.2 | 60.7 |
| Purchases of short-term investments | | | -11.2 | -167.0 |
| Sales of short-term investments | | | 31.4 | 227.7 |
| Other cash from investing | -2.1 | -8.8 | 0.0 | |
| Cash from investing | -1.2 | -4.9 | 16.5 | 55.8 |
| |
| Cash dividends paid | | | -4.5 | |
| Issuance of common stock, net | 46.8 | 116.4 | 0.6 | -10.8 |
| Other cash from financing | 118.3 | 113.3 | 77.6 | -2.0 |
| Cash from financing | 165.0 | 229.7 | 73.6 | -12.8 |
| |
| Free cash flow | -139.5 | -89.1 | -109.8 | -70.0 |
| Per share (diluted) | ($1.45) | ($3.24) | ($22.50) | ($15,021.03) |
| |
| Cash paid for interest | 7.5 | 3.9 | 7.5 | 7.6 |
| Cash paid for income taxes | 0.4 | 0.1 | 0.0 | 0.2 |