| In millions, except per share items | Jun-30-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | -60.7 | -7.5 | -25.8 | -28.8 | -25.5 | -42.9 | 42.2 | 2.0 |
| Depreciation and amortization [+] | | 4.8 | 4.0 | 2.6 | 1.5 | 0.6 | 0.8 | 0.3 |
| Depreciation | | 4.8 | -2.6 | 2.6 | 1.4 | 0.6 | -0.2 | 0.2 |
| Amortization of intangible assets | | | -0.1 | 0.1 | 0.1 | | -0.1 | 0.1 |
| Asset impairment charges | 35.6 | | | | | | | |
| Stock-based compensation | 2.1 | 2.0 | 1.0 | 2.7 | 3.0 | 4.1 | 0.6 | 0.0 |
| Change in working capital [+] | | -0.4 | -7.4 | 9.6 | -1.9 | -3.4 | 3.1 | -1.4 |
| Accounts receivable | | -0.7 | -1.7 | -0.6 | -0.1 | -0.4 | -1.2 | 0.3 |
| Inventories | | -3.2 | -0.9 | -1.7 | -1.5 | -1.0 | 0.6 | -0.1 |
| Other current assets | | -0.6 | -5.0 | 7.4 | -0.4 | -2.6 | -2.4 | -0.1 |
| Other | | 4.2 | 0.2 | 4.5 | 0.2 | 0.5 | 6.2 | -1.5 |
| Other operating activities | -1.6 | -1.1 | 22.5 | 38.9 | 18.2 | 6.3 | -54.2 | -15.1 |
| Cash from operations | -24.7 | -2.1 | -5.6 | 25.0 | -4.8 | -35.2 | -7.5 | -14.2 |
| |
| Capital expenditures | 0.0 | -11.7 | -37.4 | -35.4 | -123.8 | -22.6 | -1.2 | -4.3 |
| Purchases of property and equipment | | -11.7 | -37.4 | -35.4 | -123.8 | -22.6 | -1.2 | -4.3 |
| Acquisitions | | -1.7 | -2.2 | | -0.2 | | | |
| Sales of short-term investments, net [+] | | 0.0 | -0.3 | 10.1 | 3.0 | -2.1 | | 0.4 |
| Purchases of short-term investments | | | -1.8 | -0.2 | -0.6 | -2.1 | | |
| Sales of short-term investments | | 0.0 | 1.5 | 10.2 | 3.6 | | | 0.4 |
| Other cash from investing | | -10.3 | -22.8 | 0.9 | -143.7 | -14.3 | -11.8 | -12.8 |
| Cash from investing | 0.0 | -23.6 | -62.7 | -24.4 | -264.7 | -39.0 | -13.0 | -16.7 |
| |
| Cash dividends paid | | -0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Issuance of common stock, net | 0.5 | -3.6 | 46.8 | 109.2 | 29.2 | 13.7 | 19.1 | 125.0 |
| Other cash from financing | | 14.4 | 6.5 | -86.9 | 217.7 | -0.6 | -0.9 | -5.0 |
| Cash from financing | 0.5 | 10.6 | 53.3 | 22.2 | 246.9 | 13.0 | 18.1 | 119.9 |
| |
| Free cash flow | -24.7 | -13.8 | -43.1 | -10.3 | -128.6 | -57.8 | -8.7 | -18.6 |
| Per share (diluted) | ($20.25) | ($0.05) | ($44.58) | ($0.11) | ($2.32) | ($0.98) | ($0.17) | ($0.46) |
| |
| Cash paid for interest | | 1.1 | 1.5 | 2.6 | -0.5 | 0.1 | | 0.7 |