| 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 | -73.1 | -26.2 | -107.8 | -123.5 | -140.6 | -161.0 | -4.6 | -360.0 |
| Depreciation and amortization | 9.4 | 9.7 | 10.1 | 10.1 | 10.3 | 10.1 | 10.0 | 9.2 |
| Asset impairment charges | | | 96.0 | 390.2 | 127.8 | 155.7 | | 495.2 |
| Stock-based compensation | 2.8 | 1.5 | 1.5 | 1.9 | 2.0 | 2.0 | 0.9 | 1.2 |
| Deferred taxes | 0.1 | 0.1 | -5.0 | -7.2 | -13.0 | -23.3 | -5.5 | -34.9 |
| Change in working capital [+] | 21.4 | -10.3 | 34.4 | -15.3 | 7.2 | -11.4 | 42.2 | -2.2 |
| Accounts receivable | -0.3 | -5.8 | -1.3 | -1.9 | 1.1 | -10.5 | -1.6 | -4.8 |
| Other current assets | -2.2 | 4.1 | 0.5 | 2.0 | -8.1 | 0.6 | -0.1 | -5.0 |
| Accounts payable | 2.6 | -2.4 | 2.1 | -4.0 | 2.8 | -0.9 | 1.7 | -1.8 |
| Accrued expenses | 21.3 | -6.2 | 1.6 | -0.7 | 11.3 | -0.5 | 6.5 | 9.3 |
| Other | 0.1 | 0.0 | 31.6 | -10.8 | 0.1 | 0.0 | 35.8 | 0.1 |
| Other operating activities | 48.5 | 11.1 | -35.7 | -282.5 | 0.4 | 1.1 | -46.5 | -120.1 |
| Cash from operations | 8.9 | -14.2 | -6.4 | -26.3 | -6.0 | -26.7 | -3.4 | -11.6 |
| |
| Capital expenditures [+] | -4.6 | -5.4 | -6.1 | -4.3 | -9.1 | -8.8 | -12.6 | -9.5 |
| Purchases of property and equipment | -4.6 | -5.4 | -6.1 | -4.3 | -9.1 | -8.8 | -12.6 | -9.5 |
| Sales of property and equipment | | | 0.0 | 0.0 | 0.0 | 0.1 | 0.1 | 0.1 |
| Purchases of intangible assets | | | | | | | -0.3 | -0.4 |
| Acquisitions | | | | | | | -4.5 | |
| Other cash from investing | -0.5 | 0.4 | -0.1 | | 0.1 | | 6.1 | |
| Cash from investing | -5.0 | -5.1 | -6.2 | -4.2 | -9.0 | -8.7 | -11.2 | -9.8 |
| |
| Financing costs | -0.1 | | | | | -13.0 | | |
| Other cash from financing | -29.3 | -0.8 | 47.2 | -0.5 | -0.2 | 68.6 | -2.9 | -3.2 |
| Cash from financing | -29.3 | -0.8 | 47.2 | -0.5 | -0.2 | 81.6 | -2.9 | -3.2 |
| |
| Free cash flow | 4.3 | -19.7 | -12.5 | -30.6 | -15.1 | -35.5 | -16.0 | -21.1 |
| Per share (diluted) | $1.06 | ($0.10) | ($0.06) | ($0.15) | ($3.70) | ($0.18) | ($0.10) | ($0.11) |
| |
| Cash paid for interest | 15.1 | 9.6 | 12.2 | 11.6 | 13.9 | 3.9 | 6.6 | 6.6 |
| Cash paid for income taxes | 0.0 | | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | 0.1 |