| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | 17.3 | -0.1 | 8.4 | 3.2 | 0.0 | 0.0 | 23.7 | 3.5 |
| Depreciation and amortization | 1.7 | 1.3 | 1.7 | 1.6 | 1.5 | 1.5 | 1.5 | 1.9 |
| Asset impairment charges | 4.1 | -0.1 | -0.2 | -0.1 | 0.0 | -0.1 | 0.0 | |
| Stock-based compensation | 2.6 | 0.8 | 0.7 | 0.6 | 0.5 | 1.2 | 0.8 | 0.8 |
| Change in working capital [+] | 3.4 | -8.1 | -24.5 | -5.3 | -6.5 | -20.9 | -10.6 | -2.6 |
| Accounts receivable | -8.3 | -8.7 | -16.2 | -10.6 | -8.5 | -13.4 | -4.4 | -8.2 |
| Inventories | 0.1 | 0.0 | 0.1 | 0.4 | -0.4 | 0.1 | 0.4 | 0.2 |
| Other current assets | 0.5 | -1.6 | -2.6 | 2.2 | 0.9 | -0.5 | -2.0 | 1.3 |
| Accounts payable | 3.3 | 2.4 | -5.8 | 2.5 | 1.1 | 0.2 | -3.5 | 3.2 |
| Accrued expenses | 3.3 | 0.4 | -1.4 | -0.8 | 1.6 | -6.4 | -0.1 | 0.9 |
| Income taxes | 4.5 | -0.5 | 1.5 | 1.3 | -1.0 | -0.8 | 1.3 | 0.0 |
| Other | -0.1 | 0.0 | -0.1 | -0.1 | -0.2 | -0.1 | -2.3 | 0.1 |
| Other operating activities | -18.3 | 6.0 | 14.0 | 10.5 | 8.9 | 4.0 | -5.7 | 13.1 |
| Cash from operations | 10.6 | -0.2 | 0.3 | 10.6 | 4.4 | -14.4 | 9.7 | 16.7 |
| |
| Capital expenditures [+] | -7.7 | -3.2 | -1.9 | -3.5 | -2.5 | -1.1 | -2.3 | -1.7 |
| Purchases of property and equipment | -7.7 | -3.2 | -1.9 | -3.5 | -2.5 | -1.1 | -2.3 | -1.7 |
| Sales of property and equipment | 33.3 | | | | 2.4 | 0.0 | | |
| Purchases of short-term investments, net | -9.6 | | -14.8 | | | | | |
| Purchases of short-term investments | -24.3 | | -14.8 | | | | | |
| Sales of short-term investments | 14.8 | | | | | | | |
| Other cash from investing | | | | | | | 45.4 | |
| Cash from investing | 16.1 | -3.2 | -16.7 | -3.5 | -0.1 | -1.0 | 43.1 | -1.7 |
| |
| Repurchase of common stock, net | -0.3 | -0.6 | -2.7 | -4.2 | -2.5 | | | |
| Other cash from financing | -0.3 | -1.8 | -0.2 | -0.3 | -0.3 | -2.3 | -16.6 | -0.8 |
| Cash from financing | -0.6 | -2.3 | -2.9 | -4.5 | -2.8 | -2.3 | -16.6 | -0.8 |
| |
| Free cash flow | 3.0 | -3.5 | -1.7 | 7.1 | 1.8 | -15.4 | 7.4 | 14.9 |
| Per share (diluted) | $0.10 | ($0.12) | ($0.06) | $0.28 | $0.07 | ($0.60) | $0.30 | $0.59 |
| |
| Cash paid for interest | | 0.1 | 0.0 | 0.0 | 0.0 | 0.1 | 0.7 | 0.2 |