| 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 | 28.0 | 46.9 | -42.3 | 13.7 | -9.2 |
| Depreciation and amortization | 10.7 | 7.3 | 6.5 | 7.6 | 8.3 |
| Asset impairment charges | -1.8 | 2.4 | 31.5 | | |
| Stock-based compensation | 3.4 | | | | |
| Deferred taxes | -0.5 | 3.6 | -4.7 | -2.3 | 1.1 |
| Change in working capital [+] | 13.7 | -15.8 | 12.8 | 6.6 | 2.3 |
| Accounts receivable | 10.2 | 0.2 | -8.0 | | -2.3 |
| Inventories | -4.6 | -9.8 | -4.0 | | 3.9 |
| Accounts payable | 4.1 | -0.1 | -1.3 | | 1.6 |
| Accrued expenses | 1.8 | -6.2 | 27.7 | | 1.6 |
| Other | 2.1 | 0.1 | -1.7 | 6.6 | -2.5 |
| Other operating activities | -17.1 | -6.7 | -10.0 | -3.0 | 8.7 |
| Cash from operations | 36.3 | 37.8 | -6.2 | 22.7 | 11.2 |
| |
| Capital expenditures [+] | -14.7 | -8.5 | -5.3 | 11.1 | -12.8 |
| Purchases of property and equipment | -14.7 | -8.5 | -5.3 | 11.1 | -12.8 |
| Sales of property and equipment | 2.7 | | | 11.8 | 0.6 |
| Acquisitions | -1.2 | | | | -0.3 |
| Purchases of short-term investments, net | -12.9 | | -5.0 | | |
| Purchases of short-term investments | -34.0 | | -5.0 | | |
| Sales of short-term investments | 21.2 | | | | |
| Other cash from investing | 26.7 | 45.3 | -42.1 | 13.1 | 14.1 |
| Cash from investing | 0.6 | 36.8 | -52.4 | 36.0 | 1.6 |
| |
| Repurchase of common stock, net | -1.1 | -22.8 | | | |
| Financing costs | | | -0.2 | 0.1 | -0.1 |
| Other cash from financing | -26.6 | -23.1 | 127.5 | -67.3 | -10.2 |
| Cash from financing | -27.6 | -46.0 | 127.7 | -67.4 | -10.1 |
| |
| Free cash flow | 21.6 | 29.3 | -11.5 | 33.8 | -1.6 |
| Per share (diluted) | $1.39 | $1.64 | ($0.60) | $1.75 | ($0.08) |
| |
| Cash paid for interest | 2.0 | 2.5 | | 0.7 | 0.9 |