| 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 | -66.0 | 19.3 | 88.5 | 31.3 | 19.5 |
| Depreciation and amortization [+] | 6.8 | 6.8 | 3.5 | 0.9 | 0.5 |
| Depreciation | 0.8 | 1.0 | 0.9 | 0.8 | 0.5 |
| Amortization | 6.0 | 5.8 | 2.6 | 0.0 | 0.0 |
| Asset impairment charges | 76.1 | | | | |
| Stock-based compensation | 1.5 | 1.5 | 0.5 | | |
| Deferred taxes | -2.2 | -2.4 | -1.0 | -1.1 | -0.1 |
| Change in working capital | -2.8 | -7.0 | -4.9 | -2.0 | 4.8 |
| Other | -2.8 | -7.0 | -4.9 | -2.0 | 4.8 |
| Other operating activities | 95.6 | 76.1 | -36.5 | 23.1 | 50.5 |
| Cash from operations | 108.9 | 94.4 | 50.0 | 52.2 | 75.3 |
| |
| Capital expenditures [+] | -0.3 | -0.3 | -0.7 | -0.6 | -3.2 |
| Purchases of property and equipment | -0.3 | -0.3 | -0.7 | -0.6 | -3.2 |
| Sales of property and equipment | | | | | 2.3 |
| Acquisitions | | -3.8 | -10.5 | -5.5 | -0.8 |
| Purchases of short-term investments, net | -175.1 | -116.2 | -23.9 | -17.8 | -59.1 |
| Purchases of short-term investments | -294.0 | -197.0 | -129.2 | -89.2 | -124.6 |
| Sales of short-term investments | 118.9 | 80.8 | 105.3 | 71.4 | 65.5 |
| Other cash from investing | | 0.2 | 14.9 | | -17.8 |
| Cash from investing | -175.4 | -120.2 | -20.2 | -23.9 | -78.6 |
| |
| Cash dividends paid | | | | -0.2 | -0.2 |
| Issuance of common stock, net | | | 99.6 | | |
| Financing costs | -0.3 | | | | |
| Other cash from financing | 45.3 | -1.5 | -48.2 | -7.9 | 14.5 |
| Cash from financing | 45.6 | -1.5 | 51.4 | -8.1 | 14.3 |
| |
| Free cash flow | 108.6 | 94.0 | 49.3 | 51.5 | 72.0 |
| Per share (diluted) | $2.12 | $1.84 | $1.13 | $1.38 | $1.93 |
| |
| Cash paid for interest | 2.7 | 1.5 | 1.8 | 2.1 | 2.0 |
| Cash paid for income taxes | 8.7 | 7.0 | 9.3 | 9.1 | 5.0 |