| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -64.4 | -11.9 | -1.5 | -13.4 | 19.0 |
| Depreciation and amortization | 44.4 | 37.3 | 33.0 | 30.7 | 29.2 |
| Stock-based compensation | 55.8 | 16.6 | 6.3 | 2.8 | 2.5 |
| Deferred taxes | -19.8 | -14.9 | -9.4 | 3.1 | -13.3 |
| Change in working capital [+] | 19.3 | -24.6 | -16.3 | -8.3 | -16.1 |
| Accounts receivable | -0.9 | -14.7 | -18.0 | -1.5 | -10.0 |
| Other current assets | 0.6 | -3.3 | -6.6 | -5.8 | -0.2 |
| Accounts payable | 1.5 | 1.3 | -0.6 | 0.3 | 0.0 |
| Accrued expenses | 2.4 | -0.5 | 6.3 | 1.1 | -3.8 |
| Deferred revenues | 24.8 | 4.9 | 12.1 | 1.4 | 6.2 |
| Other | -9.1 | -12.3 | -9.5 | -3.9 | -8.2 |
| Other operating activities | 6.4 | 19.9 | -6.4 | 8.0 | -17.8 |
| Cash from operations | 41.7 | 22.4 | 5.8 | 22.9 | 3.4 |
| |
| Capital expenditures [+] | -23.2 | -15.9 | -19.2 | -9.7 | -6.0 |
| Purchases of property and equipment | -4.2 | -2.6 | -8.7 | -3.4 | -2.5 |
| Capitalized product costs | -19.0 | -13.3 | -10.5 | -6.3 | -3.4 |
| Acquisitions | -80.0 | -32.5 | | -17.4 | |
| Other cash from investing | | | -0.6 | 0.5 | |
| Cash from investing | -103.1 | -48.3 | -19.8 | -26.7 | -6.0 |
| |
| Issuance of common stock, net | | | 200.5 | -0.1 | |
| Option exercises | 3.2 | 10.4 | 1.6 | | 0.1 |
| Financing costs | -8.1 | | -1.2 | -6.0 | |
| Other cash from financing | 130.6 | 113.4 | -202.2 | 61.2 | 0.2 |
| Cash from financing | 135.5 | 103.0 | -2.0 | 67.1 | 0.1 |
| |
| Free cash flow | 37.5 | 19.8 | -2.9 | 19.4 | 0.9 |
| Per share (diluted) | $0.22 | $0.08 | ($0.19) | $0.20 | ($0.04) |
| |
| Cash paid for interest | 2.5 | 2.3 | 12.2 | 13.6 | 20.8 |
| Cash paid for income taxes | 0.4 | 1.2 | 1.1 | 0.3 | 0.2 |