| 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 | 8-K | 10-K | 10-K | 10-K |
| Net income | -15.4 | 6.6 | -0.4 | 9.0 | -34.7 | 73.2 | -33.3 | -2.7 |
| Depreciation and amortization | 16.9 | 26.0 | 14.1 | 20.6 | | 1.5 | 3.0 | -0.2 |
| Stock-based compensation | 6.2 | 7.9 | 11.6 | 13.6 | | 18.4 | 27.7 | |
| Deferred taxes | -1.5 | 0.4 | 1.0 | 2.4 | | | | |
| Change in working capital [+] | -156.8 | -120.6 | -142.8 | -219.9 | | 45.1 | -51.8 | -67.4 |
| Inventories | -140.4 | -104.1 | -99.2 | -192.0 | | -64.5 | -61.7 | -39.9 |
| Other | -16.4 | -16.5 | -43.6 | -27.9 | | 109.6 | 9.9 | -27.5 |
| Other operating activities | -37.8 | -1.7 | 38.1 | -57.9 | | -196.4 | -70.4 | 28.9 |
| Cash from operations | -188.3 | -81.4 | -78.5 | -232.0 | | -58.1 | -124.6 | -41.4 |
| |
| Capital expenditures | -0.1 | -0.2 | -2.1 | -1.7 | | -0.2 | -1.1 | -0.8 |
| Purchases of property and equipment | -0.1 | -0.2 | -2.1 | -1.7 | | -0.2 | -1.1 | -0.8 |
| Acquisitions | | | | | | -106.5 | | |
| Sales of short-term investments, net [+] | | | | | | 20.0 | 4.2 | 5.5 |
| Purchases of short-term investments | | | | | | -25.2 | -20.8 | -37.5 |
| Sales of short-term investments | | | | | | 45.2 | 25.0 | 43.0 |
| Other cash from investing | 64.1 | 75.5 | 55.1 | 2.0 | | 30.9 | 80.2 | -0.3 |
| Cash from investing | 64.0 | 75.3 | 52.9 | 0.3 | | -55.9 | 83.3 | 4.4 |
| |
| Cash dividends paid | -0.4 | -4.4 | -4.6 | | | | | |
| Issuance of common stock, net | | | | 0.0 | | 319.7 | 0.5 | |
| Financing costs | | -0.7 | | -2.8 | | -10.6 | -0.1 | -0.3 |
| Other cash from financing | -9.3 | -22.8 | -19.0 | 80.4 | | 569.9 | -5.6 | -6.8 |
| Cash from financing | -9.7 | -26.6 | -23.5 | 83.2 | | 900.2 | -5.0 | -6.6 |
| |
| Free cash flow | -188.4 | -81.6 | -80.6 | -233.7 | | -58.4 | -125.7 | -42.2 |
| Per share (diluted) | ($1.28) | ($0.37) | ($0.54) | ($1.04) | | ($0.44) | ($0.72) | ($0.58) |