| 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 | -18.5 | 30.5 | 27.1 | 12.5 | 26.0 | 27.7 | 36.0 | -45.5 |
| Depreciation and amortization | 36.1 | 40.2 | 40.1 | 40.5 | 44.1 | 41.7 | 40.7 | 43.5 |
| Asset impairment charges | | | | 17.5 | 1.1 | 19.6 | | 49.3 |
| Stock-based compensation | | | | 4.1 | 6.2 | 6.7 | 5.3 | 3.2 |
| Deferred taxes | | | | 3.0 | 7.9 | -2.4 | 10.5 | 4.1 |
| Change in working capital [+] | 4.3 | -3.2 | 20.6 | 4.7 | -40.5 | -45.1 | 8.5 | 4.0 |
| Accounts receivable | | | | 5.9 | 7.8 | -14.8 | 2.8 | 26.5 |
| Other current assets | | | | -0.9 | -4.4 | -0.5 | 8.7 | 8.8 |
| Deferred revenues | | | | 5.3 | -18.6 | -2.6 | -8.8 | 0.4 |
| Income taxes | 11.6 | -1.2 | -0.4 | -2.1 | 9.5 | 2.9 | -2.2 | 9.6 |
| Other | -7.4 | -2.0 | 21.0 | -3.6 | -34.8 | -30.0 | 8.1 | -41.2 |
| Other operating activities | 5.8 | -13.2 | 5.4 | -7.2 | 7.6 | -7.3 | -2.1 | 2.9 |
| Cash from operations | 27.6 | 54.3 | 93.2 | 75.2 | 52.4 | 40.8 | 98.9 | 61.7 |
| |
| Capital expenditures [+] | 34.6 | 31.0 | 37.4 | -21.1 | -30.0 | -44.9 | -29.2 | -32.9 |
| Purchases of property and equipment | 6.8 | 9.2 | 14.2 | -8.7 | -14.1 | -19.0 | -10.4 | -12.1 |
| Capitalized product costs | 27.8 | 21.7 | 23.2 | -12.4 | -16.0 | -25.9 | -18.8 | -20.8 |
| Sales of property and equipment | 3.0 | | | | | | | |
| Acquisitions | 26.3 | 46.4 | 10.0 | -2.3 | -2.5 | -36.0 | -3.7 | -68.3 |
| Other cash from investing | -121.8 | -148.2 | -74.4 | | 39.0 | -0.9 | -0.1 | |
| Cash from investing | -57.9 | -70.8 | -27.0 | -23.4 | 6.4 | -81.9 | -33.0 | -101.2 |
| |
| Cash dividends paid | 11.8 | 12.7 | 9.6 | -13.2 | -13.5 | -13.7 | -13.6 | -13.5 |
| Issuance of common stock, net | 26.7 | 19.1 | 2.7 | -26.2 | -10.4 | -7.4 | | -1.2 |
| Option exercises | 0.8 | 1.6 | 0.8 | 2.1 | 1.4 | 1.2 | 1.7 | 1.3 |
| Financing costs | 0.0 | 2.3 | | | 0.0 | -1.9 | 0.0 | -1.3 |
| Other cash from financing | -11.8 | -3.2 | -85.9 | -11.9 | -33.4 | 30.7 | -39.9 | 82.7 |
| Cash from financing | 25.9 | 24.7 | -74.4 | -53.4 | -58.7 | 10.3 | -55.2 | 67.9 |
| |
| Free cash flow | 34.5 | 63.5 | 107.4 | 66.5 | 38.4 | 21.7 | 88.5 | 49.5 |
| Per share (diluted) | $1.26 | $1.58 | $2.45 | $1.00 | $0.40 | ($0.07) | $1.24 | $0.52 |