| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-05-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 8-K | 10-K | 10-K |
| Net income | -2.0 | 5.3 | -15.7 | 48.5 | 12.6 | 6.6 | 10.7 | 14.8 |
| Depreciation and amortization | 24.3 | 16.4 | 12.9 | 8.1 | 6.2 | | 3.8 | 2.3 |
| Asset impairment charges | 3.4 | 2.8 | 13.1 | 4.4 | 1.7 | | 1.0 | 2.7 |
| Stock-based compensation | 37.4 | 65.8 | 25.5 | 21.5 | 18.4 | | 17.8 | 14.6 |
| Deferred taxes | 1.5 | -14.1 | -18.8 | 1.8 | -6.5 | | -4.3 | -12.4 |
| Change in working capital [+] | -121.8 | -70.4 | -51.2 | -56.8 | -30.3 | | -13.5 | -36.2 |
| Accounts receivable | -69.9 | -21.3 | -8.3 | -25.0 | -25.8 | | -9.1 | -14.6 |
| Inventories | -74.6 | -51.6 | -57.0 | -41.4 | -22.3 | | -18.8 | -19.7 |
| Other current assets | -1.2 | -13.0 | -8.9 | -4.0 | 2.2 | | 2.4 | -9.0 |
| Accounts payable | 13.4 | -1.6 | -0.3 | 6.0 | 1.3 | | 1.9 | 1.4 |
| Accrued expenses | 10.5 | 17.1 | 23.3 | 7.6 | 14.2 | | 10.2 | 5.8 |
| Other operating activities | 1.5 | 3.7 | 1.0 | -0.8 | 26.6 | | -2.9 | 1.3 |
| Cash from operations | -55.7 | 9.5 | -33.2 | 26.7 | 28.8 | | 12.7 | -12.8 |
| |
| Capital expenditures | -19.3 | -21.2 | -24.8 | -22.1 | -9.6 | | -12.5 | -13.6 |
| Purchases of property and equipment | -19.3 | -21.2 | -24.8 | -22.1 | -9.6 | | -12.5 | -13.6 |
| Purchases of intangible assets | | | | | | | -2.5 | |
| Acquisitions | | | | | -20.4 | | -9.3 | |
| Sales of short-term investments, net [+] | 74.1 | -3.1 | -76.3 | 18.0 | 31.0 | | -48.1 | 14.3 |
| Purchases of short-term investments | | -126.8 | -153.1 | -77.3 | -108.2 | | -189.7 | -63.3 |
| Sales of short-term investments | 74.1 | 123.7 | 76.7 | 95.4 | 139.2 | | 141.6 | 77.7 |
| Other cash from investing | | 2.5 | -3.1 | -8.6 | -1.4 | | -5.3 | |
| Cash from investing | 54.8 | -21.7 | -104.1 | -12.7 | -0.4 | | -77.7 | 0.7 |
| |
| Issuance of common stock, net | | | 134.8 | | | | 106.3 | |
| Option exercises | 21.6 | 18.4 | 16.5 | 13.1 | 12.3 | | 10.9 | 9.8 |
| Other cash from financing | 33.2 | 19.2 | 16.7 | 4.1 | 2.5 | | 8.9 | 16.9 |
| Cash from financing | 11.6 | 0.8 | 134.9 | -9.0 | -9.8 | | 104.4 | 7.1 |
| |
| Free cash flow | -75.0 | -11.7 | -58.0 | 4.5 | 19.2 | | 0.2 | -26.4 |
| Per share (diluted) | ($1.98) | ($0.31) | ($1.62) | $0.13 | $0.53 | | $0.00 | ($0.79) |
| |