| In millions, except per share items | 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/A | 10-K | 10-K | 10-K | S-1/A |
| Net income | -135.6 | -55.3 | -52.0 | -75.6 | -64.1 | -57.9 | -77.8 |
| Depreciation and amortization | 36.5 | 20.2 | 15.8 | 12.8 | 10.9 | 10.4 | 9.1 |
| Asset impairment charges | | 0.8 | | 9.2 | 8.4 | | |
| Stock-based compensation | 98.5 | 54.3 | 36.1 | 15.9 | 11.8 | 8.1 | 7.0 |
| Deferred taxes | 1.1 | -9.4 | -0.2 | -1.3 | -1.3 | 0.1 | -3.7 |
| Change in working capital [+] | 42.0 | 65.2 | 67.1 | 14.2 | 52.0 | 34.4 | 14.5 |
| Accounts receivable | -36.1 | -17.9 | -12.9 | -13.5 | 0.2 | -11.1 | 2.9 |
| Other current assets | -11.0 | -3.3 | -3.5 | -4.9 | -1.1 | 0.0 | |
| Accounts payable | -4.2 | 8.0 | 5.8 | -4.4 | -0.1 | 2.9 | 2.9 |
| Accrued expenses | 22.6 | 24.0 | 16.2 | 15.3 | 2.1 | | |
| Deferred revenues | | | | | 19.8 | 16.2 | |
| Other | 70.6 | 54.4 | 61.5 | 21.7 | 31.1 | 26.5 | 8.7 |
| Other operating activities | -8.4 | -33.2 | -44.7 | 21.8 | -21.1 | -16.9 | 3.9 |
| Cash from operations | 34.1 | 42.6 | 22.2 | -2.9 | -3.5 | -21.7 | -47.0 |
| |
| Capital expenditures [+] | -21.4 | -8.7 | -10.2 | -15.5 | -14.0 | -6.7 | -7.9 |
| Purchases of property and equipment | -7.7 | -4.5 | -7.9 | -14.4 | -14.0 | -6.7 | -7.9 |
| Capitalized product costs | -13.8 | -4.2 | -2.3 | -1.1 | | | |
| Purchases of intangible assets | -1.9 | -1.2 | -0.1 | -5.0 | | | |
| Acquisitions | -76.6 | -368.2 | -30.3 | | | -17.2 | |
| Purchases of short-term investments | -0.4 | | | | | | |
| Purchases of short-term investments | -0.4 | | | | | | |
| Other cash from investing | | | | | -2.3 | -5.8 | -45.9 |
| Cash from investing | -100.4 | -378.1 | -40.6 | -20.5 | -16.3 | -29.7 | -53.8 |
| |
| Issuance of common stock, net | | 556.3 | 274.7 | 190.7 | | -43.2 | -32.7 |
| Option exercises | 21.8 | 39.9 | 58.0 | 7.0 | 0.9 | 1.0 | |
| Financing costs | -17.6 | | | | -0.5 | -0.5 | |
| Other cash from financing | 923.1 | 89.7 | 137.7 | -32.2 | 14.1 | 104.7 | 55.2 |
| Cash from financing | 918.9 | 606.1 | 354.4 | 151.4 | 13.7 | 61.0 | 22.5 |
| |
| Free cash flow | 26.5 | 38.1 | 14.3 | -17.3 | -17.5 | -28.4 | -54.9 |
| Per share (diluted) | $0.15 | $0.42 | $0.16 | ($0.48) | ($3.11) | ($4.97) | ($11.98) |
| |
| Cash paid for interest | | | 0.1 | 2.5 | 2.1 | 2.0 | |