| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 29.6 | 23.2 | 19.3 | 8.2 | 25.0 | 23.8 | 16.8 |
| Depreciation and amortization | 1.4 | 1.0 | 1.1 | 0.8 | 1.1 | 1.1 | 0.8 |
| Stock-based compensation | 1.4 | 0.9 | 0.8 | 12.1 | 0.2 | | |
| Deferred taxes | -1.4 | 0.2 | -0.9 | 0.0 | -1.1 | | |
| Other operating activities | 8.7 | 4.7 | 5.0 | -2.0 | 1.8 | 1.0 | 1.7 |
| Cash from operations | 39.7 | 30.0 | 25.2 | 19.2 | 27.0 | 25.9 | 19.4 |
| |
| Capital expenditures [+] | -0.3 | -0.6 | -0.4 | -3.1 | -0.4 | -4.0 | -2.3 |
| Purchases of property and equipment | -0.3 | -0.6 | -0.4 | -3.1 | -0.4 | -4.0 | -2.3 |
| Sales of property and equipment | 3.4 | 0.0 | 0.0 | 0.4 | 1.3 | | |
| Purchases of short-term investments, net | -69.9 | 1.5 | | | | | |
| Purchases of short-term investments | -133.1 | | | | | | |
| Sales of short-term investments | 63.1 | 1.5 | | | | | |
| Other cash from investing | -275.9 | -44.4 | -119.2 | -105.4 | -38.5 | -61.8 | -42.0 |
| Cash from investing | -342.8 | -43.5 | -119.6 | -108.1 | -37.6 | -65.8 | -44.3 |
| |
| Cash dividends paid | -4.4 | -4.0 | -7.8 | -1.0 | -56.2 | -9.7 | -7.0 |
| Other cash from financing | 211.7 | 68.5 | 139.0 | 78.9 | 94.8 | 75.5 | 40.0 |
| Cash from financing | 207.3 | 64.5 | 131.2 | 77.9 | 38.6 | 65.7 | 33.0 |
| |
| Free cash flow | 39.4 | 29.4 | 24.8 | 16.1 | 26.6 | 21.9 | 17.0 |
| Per share (diluted) | $4.28 | $3.23 | $2.64 | $1.58 | $3.23 | $3.01 | $2.34 |
| |
| Cash paid for interest | 9.1 | 3.2 | 6.5 | 9.3 | 7.3 | 4.7 | 3.3 |
| Cash paid for income taxes | 10.0 | 7.5 | 7.7 | 6.8 | | | |