| 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 | -8.9 | 60.4 | -20.3 | 35.5 | 35.5 | 27.9 | 97.7 | -30.1 |
| Depreciation and amortization | 6.4 | 7.9 | 8.5 | 7.4 | 0.7 | 0.8 | 1.0 | 2.0 |
| Asset impairment charges | | | 26.1 | | | | 2.3 | 2.1 |
| Stock-based compensation | 2.0 | 1.9 | 2.5 | 2.0 | 2.5 | 2.2 | 2.9 | 6.9 |
| Deferred taxes | | 10.6 | 3.5 | 8.7 | 5.2 | 22.7 | -61.4 | |
| Change in working capital [+] | -8.5 | -6.2 | 11.6 | 1.6 | -4.7 | 1.5 | -83.9 | 56.2 |
| Accounts receivable | -1.3 | 0.5 | -2.5 | 2.1 | -1.8 | 6.7 | -0.3 | 8.4 |
| Inventories | -9.7 | 1.4 | 4.7 | 5.5 | 0.2 | | | |
| Other current assets | -0.9 | -2.1 | 3.2 | -2.2 | -0.8 | -0.4 | 1.2 | -0.1 |
| Accounts payable | | | -0.2 | 2.2 | -0.2 | -0.9 | -4.3 | -1.3 |
| Accrued expenses | | | 0.2 | -5.3 | -0.1 | -0.7 | -2.9 | -0.1 |
| Other | 3.4 | -6.0 | 6.1 | -0.8 | -2.1 | -3.2 | -77.7 | 49.4 |
| Other operating activities | 2.9 | -48.7 | 22.2 | 7.1 | -49.1 | -66.9 | 23.2 | -66.9 |
| Cash from operations | -6.1 | 26.0 | 54.0 | 62.3 | -9.9 | -11.7 | -18.3 | -29.9 |
| |
| Capital expenditures [+] | -8.9 | -6.2 | -6.7 | -7.9 | -0.5 | -0.4 | -0.3 | -0.5 |
| Purchases of property and equipment | -8.9 | -6.2 | -6.7 | -7.9 | -0.5 | -0.4 | -0.3 | -0.5 |
| Sales of property and equipment | 1.3 | 0.9 | | | | | 0.1 | 0.9 |
| Acquisitions | | | | -0.7 | -62.5 | | | -2.1 |
| Other cash from investing | 3.1 | 49.7 | -0.8 | -4.7 | 46.4 | 48.8 | 40.1 | 6.0 |
| Cash from investing | -4.6 | 44.4 | -7.5 | -13.2 | -16.5 | 48.4 | 39.9 | 4.3 |
| |
| Cash dividends paid | 0.0 | -0.1 | -5.0 | -18.3 | -20.2 | -15.7 | | |
| Repurchase of common stock, net | | | -0.2 | -5.8 | -25.3 | -16.4 | | |
| Option exercises | | | | 0.2 | | | | |
| Financing costs | | | | | -2.0 | | -1.0 | |
| Other cash from financing | -1.6 | -17.4 | -22.6 | -31.4 | 63.0 | -0.8 | -16.7 | 10.0 |
| Cash from financing | -1.7 | -17.5 | -27.7 | -55.7 | 19.5 | -32.9 | -15.7 | 10.0 |
| |
| Free cash flow | -15.0 | 19.8 | 47.4 | 54.4 | -10.4 | -12.2 | -18.5 | -30.4 |
| Per share (diluted) | ($0.81) | $1.07 | $2.62 | $2.96 | ($0.52) | ($0.57) | ($0.83) | ($1.40) |
| |
| Cash paid for interest | 0.3 | 0.5 | 2.5 | 5.7 | 1.4 | 3.6 | 3.6 | 6.3 |
| Cash paid for income taxes | 0.0 | 8.9 | -0.1 | 4.3 | 7.5 | 1.7 | 0.5 | 0.0 |