| 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 | Dec-31-15 |
| | 8-K | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K/A |
| Net income | 31.2 | 15.4 | 15.7 | 16.3 | 15.8 | 9.2 | 9.6 | 7.1 |
| Depreciation and amortization [+] | | | 2.5 | 2.4 | 2.3 | 1.6 | 2.4 | 2.4 |
| Depreciation | 2.0 | 0.7 | 1.9 | 1.8 | 1.4 | 1.4 | | |
| Amortization | | | 0.5 | 0.6 | 0.9 | 0.2 | | |
| Stock-based compensation | | | 0.3 | 0.1 | 0.4 | 1.1 | 0.3 | 0.3 |
| Deferred taxes | | | | | -1.6 | 4.5 | 5.7 | 3.9 |
| Change in working capital | | | -0.5 | -8.2 | 6.3 | -0.5 | -0.7 | 0.0 |
| Other | | | -0.5 | -8.2 | 6.3 | -0.5 | -0.7 | 0.0 |
| Other operating activities | | | 0.5 | 3.1 | -4.9 | 3.6 | 1.6 | 1.4 |
| Cash from operations | | | 18.4 | 13.7 | 18.3 | 19.5 | 19.0 | 15.1 |
| |
| Capital expenditures [+] | | | -2.4 | -2.2 | -1.1 | -1.3 | -0.7 | -1.5 |
| Purchases of property and equipment | | | -2.4 | -2.2 | -1.1 | -1.3 | -0.7 | -1.5 |
| Sales of property and equipment | | | 0.0 | | | | | |
| Sales of short-term investments, net [+] | | | -15.1 | 35.4 | 38.5 | -33.5 | | |
| Purchases of short-term investments | | | -73.5 | 0.0 | -0.6 | -84.5 | | |
| Sales of short-term investments | | | 58.3 | 35.4 | 39.1 | 51.0 | | |
| Other cash from investing | | | -262.6 | -78.9 | -79.8 | -37.5 | -33.0 | -63.8 |
| Cash from investing | | | -280.1 | -45.7 | -42.5 | -72.3 | -33.7 | -65.3 |
| |
| Cash dividends paid | | | -6.0 | -5.3 | -4.1 | -2.8 | | |
| Repurchase of common stock, net | | | -9.1 | -4.5 | | | | |
| Other cash from financing | | | 368.7 | 69.5 | 63.6 | 11.5 | | |
| Cash from financing | | | 353.6 | 59.7 | 59.6 | 8.7 | 0.0 | 0.0 |
| |
| Free cash flow | | | 16.1 | 11.5 | 17.2 | 18.3 | 18.3 | 13.6 |
| Per share (diluted) | | | $1.30 | $0.90 | $1.35 | $1.44 | $1.44 | $1.07 |
| |
| Cash paid for interest | | | 6.8 | 10.1 | 5.0 | 2.4 | | |