| 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 | -14.4 | -30.6 | -5.5 | 7.9 | 3.0 | -22.4 | 10.5 | 42.2 |
| Depreciation and amortization [+] | 7.1 | 8.9 | 12.0 | 11.5 | 12.1 | 10.6 | 10.8 | 6.3 |
| Depreciation | 2.9 | 3.0 | 2.9 | 2.1 | | | | 1.4 |
| Amortization | 4.1 | 5.9 | 9.1 | 9.5 | | | | 4.9 |
| Stock-based compensation | 8.6 | 4.4 | 4.7 | 3.4 | 4.0 | 3.5 | 2.8 | 3.8 |
| Deferred taxes | 1.6 | 2.8 | -1.5 | -1.6 | -7.4 | 13.1 | -4.9 | -0.7 |
| Change in working capital [+] | 12.1 | 34.8 | 8.9 | -4.3 | -1.2 | 14.1 | 9.1 | 16.9 |
| Accounts receivable | -9.7 | 2.0 | 5.2 | -4.8 | -12.0 | -8.4 | -8.1 | 2.9 |
| Inventories | -2.2 | 2.2 | 6.7 | -5.4 | -2.4 | 5.4 | 3.2 | 13.3 |
| Other current assets | | | | | | | | -0.4 |
| Accounts payable | 9.3 | 2.7 | -5.2 | 3.6 | -1.5 | -1.0 | 0.2 | -6.6 |
| Accrued expenses | 2.2 | 3.1 | -3.1 | -1.3 | 2.2 | 2.5 | 0.0 | 1.4 |
| Deferred revenues | 8.2 | 9.7 | 8.3 | 1.5 | 9.5 | 3.7 | 14.4 | 3.0 |
| Income taxes | 4.4 | 15.0 | -3.0 | 2.0 | 2.9 | 15.9 | 3.8 | 3.4 |
| Other | | | | | | -4.0 | -4.4 | 0.0 |
| Other operating activities | -20.8 | -23.1 | -3.7 | 1.4 | -9.3 | -1.2 | 0.2 | 0.3 |
| Cash from operations | -5.8 | -2.7 | 14.9 | 18.2 | 1.2 | 17.6 | 28.4 | 68.8 |
| |
| Capital expenditures | -5.0 | -2.2 | -3.1 | -7.5 | -3.7 | -3.1 | -2.0 | -1.4 |
| Purchases of property and equipment | -5.0 | -2.2 | -3.1 | -7.5 | -3.7 | -3.1 | -2.0 | -1.4 |
| Purchases of intangible assets | 0.0 | 0.0 | -0.1 | | | | | -0.1 |
| Acquisitions | | | | | | | | -74.5 |
| Sales of short-term investments, net [+] | 32.7 | -8.8 | -1.4 | -2.4 | 57.2 | 16.3 | -49.9 | 20.0 |
| Purchases of short-term investments | -15.8 | -59.9 | -34.1 | -33.8 | -22.8 | -178.7 | -184.7 | -109.7 |
| Sales of short-term investments | 48.6 | 51.1 | 32.6 | 31.4 | 80.0 | 195.0 | 134.8 | 129.7 |
| Other cash from investing | 18.9 | | | | -53.3 | -0.5 | -4.5 | 0.0 |
| Cash from investing | 46.6 | -11.0 | -4.7 | -9.9 | 0.2 | 12.8 | -56.5 | -56.0 |
| |
| Repurchase of common stock, net | -5.7 | -7.5 | -5.0 | | | | | |
| Other cash from financing | -1.6 | -2.9 | -2.0 | -0.6 | -1.0 | -0.6 | -1.1 | -6.4 |
| Cash from financing | -7.3 | -10.4 | -7.1 | -0.6 | -1.0 | -0.6 | -1.1 | -6.4 |
| |
| Free cash flow | -10.8 | -4.9 | 11.8 | 10.8 | -2.5 | 14.5 | 26.4 | 67.4 |
| Per share (diluted) | ($0.27) | ($0.12) | $0.30 | $0.27 | ($0.06) | $0.37 | $0.66 | $1.70 |
| |
| Cash paid for income taxes | 2.0 | 7.7 | 9.4 | 7.8 | 10.9 | 6.4 | 6.0 | 6.8 |