| 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 | 50.7 | 49.8 | -35.7 | -10.4 | 36.6 | 27.2 | 26.2 | 80.1 |
| Depreciation and amortization | 0.3 | 0.7 | 1.0 | 1.0 | 1.3 | 1.4 | 1.3 | 1.0 |
| Asset impairment charges | | 16.2 | 22.8 | 30.7 | 17.4 | | 1.7 | |
| Stock-based compensation | 10.4 | 10.0 | 11.7 | 11.6 | 13.3 | 14.7 | 14.9 | 10.9 |
| Deferred taxes | -1.3 | 0.3 | -2.2 | -0.3 | -6.1 | 8.8 | 12.9 | 53.0 |
| Change in working capital [+] | 0.6 | 8.6 | -5.9 | 15.0 | -16.8 | 0.1 | -10.7 | 5.8 |
| Accounts receivable | -0.7 | -3.5 | -0.2 | 0.0 | 3.8 | -3.5 | 9.8 | -9.3 |
| Accounts payable | 0.0 | -1.1 | 1.3 | 0.7 | -4.3 | 2.4 | -8.0 | 0.0 |
| Income taxes | -2.3 | 3.1 | -2.4 | 4.5 | 5.7 | -11.2 | 1.7 | 3.0 |
| Other | 3.7 | 10.1 | -4.5 | 9.8 | -22.1 | 12.5 | -14.1 | 12.2 |
| Other operating activities | -5.6 | -10.3 | 55.4 | 9.9 | -8.2 | -3.7 | 8.7 | 4.3 |
| Cash from operations | 55.1 | 75.3 | 47.1 | 57.5 | 37.5 | 48.5 | 54.9 | 155.1 |
| |
| Capital expenditures | -0.2 | -0.3 | -0.5 | 0.0 | -0.1 | -0.3 | -1.1 | -2.6 |
| Purchases of property and equipment | -0.2 | -0.3 | -0.5 | 0.0 | -0.1 | -0.3 | -1.1 | -2.6 |
| Acquisitions | | | | | -239.3 | -2.1 | -11.8 | |
| Purchases of short-term investments, net | -21.8 | -5.6 | | -8.1 | 64.5 | -17.0 | -57.6 | 4.8 |
| Purchases of short-term investments | -21.9 | -5.8 | | -8.1 | | -108.1 | -63.6 | |
| Sales of short-term investments | 0.0 | 0.1 | | | 64.5 | 91.1 | 6.0 | 4.8 |
| Other cash from investing | -15.6 | -93.7 | 11.1 | -9.5 | -6.9 | -17.6 | -18.8 | -14.5 |
| Cash from investing | -37.7 | -99.6 | 10.6 | -17.7 | -181.8 | -37.0 | -89.3 | -12.3 |
| |
| Cash dividends paid | -19.4 | -19.5 | -20.1 | -20.4 | -19.2 | -43.8 | -43.7 | -78.5 |
| Repurchase of common stock, net | -3.4 | -34.5 | -31.2 | -2.3 | -2.9 | -7.9 | -39.4 | -24.1 |
| Option exercises | | 0.8 | 0.3 | 0.2 | 0.2 | 0.5 | 0.2 | 4.5 |
| Financing costs | | | | | -8.7 | | | |
| Other cash from financing | | 147.3 | -8.6 | -20.7 | 182.8 | 1.1 | 0.4 | 9.0 |
| Cash from financing | -22.8 | 92.6 | -60.2 | -43.6 | 169.2 | -51.1 | -82.8 | -98.1 |
| |
| Free cash flow | 54.9 | 75.0 | 46.7 | 57.4 | 37.4 | 48.2 | 53.8 | 152.5 |
| Per share (diluted) | $0.35 | $0.47 | $0.31 | $0.38 | $0.24 | $0.35 | $0.40 | $1.10 |
| |
| Cash paid for interest | 12.3 | 9.9 | 7.1 | 8.0 | 5.6 | | | |
| Cash paid for income taxes | 12.5 | 8.5 | 10.1 | 10.1 | 14.4 | 33.1 | 15.0 | 1.3 |