| 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/A | 10-K/A | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 13.3 | 1.8 | -13.4 | 16.4 | 4.7 | 3.5 | 6.6 | 10.9 |
| Depreciation and amortization | 2.2 | 1.8 | 2.3 | 1.3 | 1.8 | 2.1 | 2.5 | 2.8 |
| Asset impairment charges | 0.2 | | 2.9 | | | | | |
| Stock-based compensation | 1.8 | 3.7 | 6.2 | 1.0 | 0.9 | 1.0 | 0.9 | 0.4 |
| Deferred taxes | 0.8 | 0.8 | -3.4 | 0.3 | -0.3 | 0.3 | -0.2 | -0.3 |
| Change in working capital [+] | 4.8 | -24.0 | 7.0 | 1.3 | 0.1 | -0.4 | -0.4 | -7.7 |
| Accounts receivable | 1.3 | -9.7 | 6.2 | -0.7 | -1.5 | 3.1 | 1.3 | -0.8 |
| Other current assets | 1.6 | -8.1 | 1.2 | -0.6 | 0.1 | -0.5 | 1.0 | 0.7 |
| Accounts payable | 0.9 | -3.3 | -0.7 | 1.1 | 0.0 | -1.6 | -2.5 | -1.1 |
| Accrued expenses | -0.5 | 0.3 | -2.1 | -0.2 | | -0.5 | -1.7 | -1.7 |
| Income taxes | -0.2 | -0.1 | -0.2 | 0.4 | 1.6 | 1.6 | 0.9 | 0.8 |
| Other | 1.6 | -3.1 | 2.6 | 1.4 | -0.1 | -2.5 | 0.7 | -5.6 |
| Other operating activities | -46.2 | 7.7 | 45.5 | -9.1 | -1.8 | -4.4 | -0.8 | -1.9 |
| Cash from operations | -23.1 | -8.1 | 47.0 | 11.2 | 5.3 | 2.1 | 8.7 | 4.2 |
| |
| Capital expenditures [+] | -0.5 | 0.0 | -0.3 | -0.5 | -0.8 | -0.7 | -0.9 | -1.3 |
| Purchases of property and equipment | -0.5 | 0.0 | -0.3 | -0.5 | -0.8 | -0.7 | -0.9 | -1.3 |
| Sales of property and equipment | | | 0.8 | | 0.2 | | | |
| Purchases of intangible assets | -1.0 | | | | | | | |
| Acquisitions | | | | | | | 0.1 | -17.0 |
| Other cash from investing | 0.2 | 0.1 | 1.5 | -0.7 | -3.1 | 2.9 | -0.1 | 17.0 |
| Cash from investing | -1.3 | 0.1 | 2.1 | -1.1 | -3.7 | 2.2 | -0.9 | -1.2 |
| |
| Repurchase of common stock, net | -0.6 | -5.5 | -1.2 | -10.8 | -5.3 | -9.7 | -9.7 | -1.6 |
| Option exercises | 1.9 | | 0.1 | 1.7 | | | | |
| Other cash from financing | 3.8 | -5.7 | -5.7 | 3.4 | | | -5.6 | -18.4 |
| Cash from financing | 1.3 | -11.2 | -7.0 | -9.1 | -5.3 | -9.7 | -15.3 | -20.0 |
| |
| Free cash flow | -23.6 | -8.1 | 46.8 | 10.8 | 4.6 | 1.3 | 7.8 | 2.9 |
| Per share (diluted) | ($1.88) | ($0.62) | $4.12 | $0.89 | $0.36 | $0.10 | $0.56 | $0.20 |
| |
| Cash paid for interest | | 0.0 | 0.1 | | | | 0.1 | 0.1 |
| Cash paid for income taxes | 1.1 | 3.1 | 2.0 | 4.7 | 4.3 | 6.2 | 3.3 | 0.8 |