| 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 |
| | Source | Source | Source | Source | Source | Source | 6-K |
| Net income | -89.0 | -49.3 | -70.5 | -24.6 | 4.5 | 15.4 | -2.7 |
| Depreciation and amortization [+] | 28.7 | 32.3 | 33.2 | 39.2 | 30.5 | 25.9 | 40.4 |
| Depreciation | | | | | | | 20.2 |
| Amortization | | | | | | | 20.2 |
| Asset impairment charges | 12.3 | | 0.9 | | 3.7 | | |
| Stock-based compensation | 19.8 | 19.9 | 12.9 | 13.1 | 10.3 | 7.6 | 8.9 |
| Deferred taxes | -3.6 | -1.2 | 8.7 | -1.7 | 0.8 | -2.7 | -2.8 |
| Change in working capital [+] | -40.3 | 47.9 | 53.6 | 14.0 | -40.6 | 3.1 | -12.1 |
| Accounts receivable | -18.6 | 1.2 | 38.0 | -5.5 | -12.7 | -26.5 | -8.4 |
| Inventories | -49.7 | 11.0 | -3.7 | 1.5 | -6.8 | -5.8 | -16.3 |
| Other current assets | -11.8 | 7.6 | -8.6 | -3.5 | -5.3 | 7.0 | |
| Deferred revenues | | | 5.8 | -1.4 | 0.3 | 1.2 | |
| Other | 39.8 | 28.0 | 22.2 | 23.0 | -16.2 | 27.2 | 12.6 |
| Other operating activities | -4.5 | -57.4 | -31.9 | 7.3 | -10.1 | -2.8 | -15.0 |
| Cash from operations | -76.5 | -7.8 | 6.9 | 47.2 | -0.9 | 46.5 | 16.8 |
| |
| Capital expenditures [+] | -15.1 | -19.0 | -16.5 | -18.2 | -14.1 | -17.0 | -14.0 |
| Purchases of property and equipment | -15.1 | -19.0 | -16.5 | -18.2 | -14.1 | -17.0 | -14.0 |
| Sales of property and equipment | 0.1 | 0.3 | 0.1 | 0.1 | 0.0 | 0.0 | |
| Purchases of intangible assets | -4.8 | -3.0 | -3.8 | -2.9 | -1.7 | -0.9 | |
| Acquisitions | -0.3 | -21.9 | | | -3.1 | -2.9 | |
| Other cash from investing | | 144.2 | 3.8 | 5.0 | -18.7 | -5.9 | -114.0 |
| Cash from investing | -20.2 | 100.6 | -16.4 | -16.0 | -37.6 | -26.6 | -128.0 |
| |
| Issuance of common stock, net | 5.4 | 2.0 | 0.5 | -0.5 | 2.9 | -8.2 | 3.8 |
| Other cash from financing | -2.0 | -4.7 | -2.2 | -5.4 | -3.2 | -5.5 | -9.2 |
| Cash from financing | 3.4 | -2.8 | -1.7 | -5.9 | -0.3 | -13.7 | -5.3 |
| |
| Free cash flow | -91.7 | -26.7 | -9.6 | 29.1 | -15.0 | 29.5 | 2.8 |
| Per share (diluted) | ($2.47) | ($0.73) | ($0.27) | $0.81 | ($0.46) | $0.91 | $0.09 |