| 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 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 85.9 | 27.5 | 11.7 | 2.7 | 21.3 | -8.5 | -26.0 | -8.9 |
| Depreciation and amortization [+] | 0.4 | 0.4 | 3.0 | 3.6 | 2.1 | 2.1 | 0.6 | 0.4 |
| Depreciation | 0.4 | 0.4 | 3.0 | 3.6 | 2.1 | 2.1 | 0.6 | 0.4 |
| Asset impairment charges | 2.1 | | 1.4 | 0.4 | 2.7 | | | |
| Stock-based compensation | 3.0 | 2.8 | 1.1 | 1.1 | 4.5 | 5.2 | 4.8 | 5.2 |
| Deferred taxes | -0.6 | -0.1 | 7.1 | 3.5 | -13.5 | -0.4 | -0.1 | -0.2 |
| Change in working capital [+] | 7.3 | 3.7 | 27.0 | -9.7 | 10.6 | 18.8 | -22.9 | 1.9 |
| Restricted cash | | | | | | | 0.9 | -1.1 |
| Accounts receivable | -16.3 | -0.4 | -2.3 | -12.0 | 7.8 | -8.0 | -6.0 | 4.2 |
| Inventories | 2.0 | -0.8 | -0.3 | -6.7 | -4.8 | 2.0 | 5.7 | -0.3 |
| Income taxes | 13.0 | 8.5 | 28.2 | 3.6 | 15.1 | 11.7 | -21.2 | -10.7 |
| Other | 8.6 | -3.6 | 1.4 | 5.5 | -7.6 | 13.2 | -2.3 | 9.7 |
| Other operating activities | -32.0 | -10.6 | -26.2 | 14.1 | -8.3 | -8.0 | 59.2 | -1.5 |
| Cash from operations | 66.0 | 23.7 | 25.0 | 15.8 | 19.4 | 9.4 | 15.6 | -3.1 |
| |
| Capital expenditures [+] | -1.0 | -0.1 | -0.2 | -0.4 | -0.6 | -3.3 | -0.6 | -0.3 |
| Purchases of property and equipment | -1.0 | -0.1 | -0.2 | -0.4 | -0.6 | -3.3 | -0.6 | -0.3 |
| Sales of property and equipment | | | 2.7 | | 0.1 | | 0.0 | |
| Acquisitions | | | | -2.0 | -0.3 | -4.2 | -8.9 | -0.4 |
| Sales of short-term investments, net [+] | | -1.0 | -5.0 | | | | 11.9 | 4.7 |
| Purchases of short-term investments | | -1.0 | -5.0 | | | | | |
| Sales of short-term investments | | | | | | | 11.9 | 4.7 |
| Other cash from investing | -48.3 | 3.8 | -0.5 | -3.3 | -2.2 | -9.1 | -11.9 | -35.6 |
| Cash from investing | -49.3 | 2.7 | -3.0 | -5.8 | -2.9 | -16.5 | -9.5 | -31.6 |
| |
| Cash dividends paid | -9.2 | -1.5 | -10.1 | -9.6 | -9.3 | -8.9 | -7.4 | -4.4 |
| Repurchase of common stock, net | -4.4 | -3.8 | -1.7 | -5.6 | 6.0 | -1.1 | 1.0 | 2.5 |
| Option exercises | | | 0.0 | 1.4 | | 0.1 | | 0.2 |
| Other cash from financing | -12.0 | -0.3 | -3.3 | 1.0 | -0.9 | 2.0 | -3.3 | 3.7 |
| Cash from financing | -25.5 | -5.7 | -15.2 | -15.6 | -4.2 | -8.1 | -9.7 | 1.6 |
| |
| Free cash flow | 65.0 | 23.6 | 24.9 | 15.3 | 18.8 | 6.1 | 15.0 | -3.4 |
| Per share (diluted) | $2.46 | $0.90 | $0.93 | $0.56 | $0.73 | $0.26 | $0.66 | ($0.15) |
| |
| Cash paid for interest | 0.1 | 0.4 | 0.3 | 0.5 | 0.4 | 0.3 | 0.0 | 0.0 |
| Cash paid for income taxes | 8.6 | 0.0 | 0.7 | 0.7 | 1.8 | 0.0 | 0.7 | 0.0 |