| 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-26-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 242.4 | -17.5 | -59.9 | -8.9 | -63.5 | -42.8 | -40.6 |
| Depreciation and amortization | 42.6 | 36.2 | 15.7 | 8.4 | 5.3 | 5.3 | 2.6 |
| Asset impairment charges | | | | | | 0.3 | |
| Stock-based compensation | 187.5 | 134.1 | 85.2 | 37.7 | 11.0 | 8.2 | 5.3 |
| Change in working capital [+] | -242.1 | -71.9 | -52.2 | -35.0 | 13.2 | -27.8 | -5.5 |
| Accounts receivable | -221.8 | -196.0 | -110.2 | -50.7 | -41.2 | -26.4 | -14.1 |
| Inventories | 3.6 | -4.2 | -14.1 | -3.0 | 10.8 | -13.3 | -3.8 |
| Other current assets | -67.2 | -3.5 | -9.9 | -0.3 | -6.5 | -0.5 | -1.9 |
| Accounts payable | 8.4 | 6.4 | 9.4 | -0.1 | 24.3 | -2.8 | 4.7 |
| Accrued expenses | 38.3 | 103.2 | 74.5 | 17.9 | 24.1 | 17.8 | 2.8 |
| Deferred revenues | -2.3 | 21.5 | | | | | 8.3 |
| Other | -1.1 | 0.6 | -1.9 | 1.2 | 1.6 | -2.6 | -1.6 |
| Other operating activities | -2.4 | 67.3 | 25.0 | 11.7 | 71.3 | 24.2 | 5.7 |
| Cash from operations | 228.1 | 148.2 | 13.7 | 13.9 | 37.3 | -32.5 | -32.6 |
| |
| Capital expenditures | -40.0 | -82.4 | -77.2 | -18.3 | -9.2 | -8.6 | -5.0 |
| Purchases of property and equipment | -40.0 | -82.4 | -77.2 | -18.3 | -9.2 | -8.6 | -5.0 |
| Purchases of intangible assets | | | -7.4 | | | | |
| Acquisitions | -136.8 | | -68.1 | | -3.0 | | |
| Sales of short-term investments, net [+] | | | 42.4 | -41.8 | | | |
| Purchases of short-term investments | | | -12.4 | -53.8 | | | |
| Sales of short-term investments | | | 54.8 | 12.0 | | | |
| Other cash from investing | | 1.1 | | | -0.1 | 0.0 | -0.2 |
| Cash from investing | -176.8 | -81.3 | -110.3 | -60.1 | -12.3 | -8.6 | -5.2 |
| |
| Issuance of common stock, net | 989.6 | 497.2 | 330.5 | | | | |
| Option exercises | 18.5 | 16.8 | 28.2 | 25.0 | 1.8 | 0.4 | 0.8 |
| Other cash from financing | 32.1 | 28.6 | 156.0 | 49.6 | 119.4 | 0.3 | 59.4 |
| Cash from financing | 1,003.1 | 509.0 | 458.3 | 24.5 | 117.7 | -0.2 | 58.5 |
| |
| Free cash flow | 188.0 | 65.8 | -63.5 | -4.4 | 28.1 | -41.1 | -37.6 |
| Per share (diluted) | $1.33 | $0.53 | ($0.55) | ($0.04) | $0.99 | ($8.65) | ($9.34) |
| |
| Cash paid for interest | 2.6 | 3.5 | 3.1 | 0.5 | 1.1 | 0.2 | 0.3 |