| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | S-1/A | S-1/A |
| Net income | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deferred taxes | 2.2 | | | | |
| Change in working capital [+] | 21.2 | 58.2 | 16.0 | | |
| Deferred revenues | -6.5 | 49.9 | 8.1 | | |
| Income taxes | 27.8 | 15.3 | 8.3 | | |
| Other | 0.0 | -7.0 | -0.5 | | |
| Other operating activities | -109.3 | -64.3 | -34.4 | | |
| Cash from operations | -85.8 | -6.1 | -18.4 | | |
| |
| Capital expenditures | 1.7 | 2.2 | 1.3 | | |
| Purchases of property and equipment | 1.7 | 2.2 | 1.3 | | |
| Purchases of short-term investments | 7.5 | 7.5 | | | |
| Purchases of short-term investments | 7.5 | 7.5 | | | |
| Other cash from investing | -10.8 | -19.5 | -2.6 | | |
| Cash from investing | -1.7 | -9.8 | -1.3 | | |
| |
| Issuance of common stock, net | 94.3 | 232.0 | | | |
| Option exercises | 1.0 | 0.8 | | | |
| Other cash from financing | 2.3 | 16.6 | 103.2 | | |
| Cash from financing | 95.6 | 247.8 | 103.2 | | |
| |
| Free cash flow | -84.1 | -3.8 | -17.1 | | |
| Per share (diluted) | ($2.22) | ($0.19) | ($11.20) | | |
| |
| Cash paid for interest | 0.2 | 0.2 | | | |