| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 |
| | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -438.9 | -187.9 | -149.1 | -23.6 | -27.8 |
| Depreciation and amortization | 17.9 | 11.7 | 1.6 | 0.7 | 0.4 |
| Asset impairment charges | 168.1 | 0.6 | 3.6 | | |
| Stock-based compensation | 108.2 | 60.3 | 23.8 | 1.2 | 6.7 |
| Deferred taxes | -0.7 | -19.4 | | | |
| Change in working capital [+] | 27.2 | 69.1 | 45.1 | 7.6 | 8.1 |
| Accounts receivable | 5.6 | 0.9 | | | |
| Other current assets | 11.6 | -6.3 | -7.5 | -4.3 | -1.0 |
| Accounts payable | -17.2 | 6.3 | 10.7 | -0.1 | 1.9 |
| Other | 27.2 | 68.2 | 41.9 | 11.9 | 7.2 |
| Other operating activities | -61.3 | -114.6 | 18.8 | -7.8 | -4.3 |
| Cash from operations | -179.6 | -180.2 | -56.2 | -21.9 | -16.9 |
| |
| Capital expenditures | -1.9 | -3.2 | -3.2 | -3.2 | -0.9 |
| Purchases of property and equipment | -1.9 | -3.2 | -3.2 | -3.2 | -0.9 |
| Acquisitions | | -84.0 | | | |
| Purchases of short-term investments, net | 313.3 | -501.9 | | | |
| Purchases of short-term investments | -454.1 | -504.0 | | | |
| Sales of short-term investments | 767.4 | 2.1 | | | |
| Other cash from investing | | -54.8 | | | |
| Cash from investing | 311.4 | -643.9 | -3.2 | -3.2 | -0.9 |
| |
| Issuance of common stock, net | | 402.1 | -1.3 | | |
| Option exercises | 1.3 | 3.9 | 1.2 | 0.2 | 0.2 |
| Financing costs | -2.0 | 0.0 | -0.2 | | |
| Other cash from financing | -11.3 | 404.4 | 299.0 | 31.4 | 33.5 |
| Cash from financing | -10.6 | 802.7 | 296.6 | 31.2 | 33.3 |
| |
| Free cash flow | -181.5 | -183.4 | -59.5 | -25.2 | -17.8 |
| Per share (diluted) | ($0.44) | ($0.47) | ($0.20) | ($0.10) | ($0.08) |
| |
| Cash paid for interest | 30.3 | 0.2 | 0.8 | 0.3 | 0.2 |