| 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 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K/A | 10-K |
| Net income | -104.0 | -99.6 | -273.0 | 33.7 | -223.4 | -34.6 | 11.1 | 17.7 |
| Depreciation and amortization [+] | 34.0 | 41.3 | 34.6 | 11.5 | 23.2 | 21.6 | 15.0 | 8.5 |
| Amortization of intangible assets | 30.8 | 30.8 | 25.6 | 1.7 | 23.8 | | | |
| Asset impairment charges | | 4.1 | 277.6 | | 296.8 | | | |
| Stock-based compensation | 3.0 | 8.1 | 14.3 | 21.3 | 32.8 | 36.4 | 33.5 | 29.4 |
| Deferred taxes | -5.2 | 4.7 | -2.0 | -14.5 | -54.0 | -11.2 | 4.0 | 6.7 |
| Change in working capital [+] | 24.9 | -12.0 | -41.4 | 47.6 | -20.8 | 17.9 | -38.3 | -2.2 |
| Restricted cash | | | | | | | -4.8 | 0.1 |
| Accounts receivable | 3.2 | 1.9 | 1.3 | 58.0 | -29.1 | -20.0 | 0.7 | -1.4 |
| Inventories | 7.9 | -3.5 | 3.8 | 8.4 | 5.5 | -6.7 | -9.6 | -0.7 |
| Other current assets | 8.4 | -1.2 | 14.4 | -15.4 | 3.4 | 6.9 | -1.0 | -4.1 |
| Deferred revenues | | | | | | | -22.2 | |
| Other | 5.5 | -9.2 | -61.0 | -3.4 | -0.6 | 37.6 | -1.4 | 3.9 |
| Other operating activities | 5.9 | -7.6 | -138.2 | 51.3 | 42.5 | -0.4 | 13.3 | 14.6 |
| Cash from operations | -41.3 | -61.0 | -128.2 | 150.8 | 97.1 | 29.6 | 38.5 | 74.6 |
| |
| Capital expenditures | -0.2 | -4.4 | -90.4 | -33.3 | -13.7 | -6.2 | -5.9 | -5.1 |
| Purchases of property and equipment | -0.2 | -4.4 | -90.4 | -33.3 | -13.7 | -6.2 | -5.9 | -5.1 |
| Purchases of intangible assets | 0.0 | | | -0.6 | -0.7 | -0.9 | -1.1 | -2.7 |
| Sales of short-term investments, net [+] | | 63.8 | 89.9 | -150.8 | | 199.8 | -78.2 | 190.1 |
| Purchases of short-term investments | | | -226.6 | -249.1 | | -40.2 | -434.7 | -580.4 |
| Sales of short-term investments | | 63.8 | 316.5 | 98.3 | | 240.0 | 356.5 | 770.5 |
| Other cash from investing | 74.0 | | | 7.9 | 3.7 | -266.5 | | -476.2 |
| Cash from investing | 73.8 | 59.4 | -0.5 | -176.9 | -10.7 | -73.8 | -85.2 | -293.8 |
| |
| Issuance of common stock, net | | | -0.1 | 13.5 | 10.4 | 75.5 | 18.1 | 16.0 |
| Financing costs | | -1.1 | -4.7 | | | -1.6 | | -7.5 |
| Other cash from financing | -69.7 | -2.7 | -65.2 | -0.7 | 51.1 | -31.2 | -0.3 | 329.8 |
| Cash from financing | -69.7 | -1.7 | -60.6 | 12.8 | 61.5 | 45.9 | 17.8 | 353.3 |
| |
| Free cash flow | -41.5 | -65.4 | -218.6 | 117.5 | 83.4 | 23.5 | 32.6 | 69.6 |
| Per share (diluted) | ($3.91) | ($8.09) | ($27.58) | $2.48 | $1.81 | $0.52 | $0.75 | $1.64 |
| |
| Cash paid for interest | 0.0 | 6.7 | 6.1 | 6.1 | 6.1 | 6.1 | 7.2 | 4.5 |