| 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 | 8-K | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | 13.6 | 34.6 | 30.7 | 8.4 | 4.1 | -23.3 | -29.9 | -26.9 |
| Depreciation and amortization | | | | 18.8 | 19.1 | 19.5 | 19.9 | 19.9 |
| Depreciation | | | 18.7 | | | | | |
| Stock-based compensation | | | | | 0.1 | 0.1 | 0.1 | |
| Change in working capital [+] | | | | -14.5 | -11.7 | 3.3 | 1.8 | 5.2 |
| Accounts receivable | | | | | -0.9 | 1.7 | -0.9 | |
| Other current assets | | | | | 1.6 | 1.9 | 1.6 | |
| Other | | | | -15.2 | -12.4 | -0.2 | 1.1 | 4.1 |
| Other operating activities | | | | -10.3 | -9.8 | 11.0 | 10.4 | -0.3 |
| Cash from operations | | | | 2.5 | 1.9 | 10.6 | 2.3 | -1.6 |
| |
| Capital expenditures [+] | | | | 3.9 | 2.3 | 1.3 | 1.5 | 2.0 |
| Purchases of property and equipment | | | | 3.9 | 2.3 | 1.3 | 1.5 | 2.0 |
| Sales of property and equipment | 0.1 | | | 52.4 | 52.6 | 11.3 | | 0.2 |
| Other cash from investing | | | | -7.9 | -5.6 | -4.0 | -4.0 | -3.9 |
| Cash from investing | | | | 48.5 | 49.3 | 8.6 | -2.4 | -1.8 |
| |
| Financing costs | | | | | | | 0.1 | |
| Other cash from financing | | | | -53.7 | -53.3 | -21.7 | -9.6 | 11.4 |
| Cash from financing | | | | -53.8 | -53.4 | -21.8 | -9.7 | 12.9 |
| |
| Free cash flow | | | | 6.4 | 4.1 | 11.9 | 3.8 | 0.4 |
| Per share (diluted) | | | | $0.37 | $0.25 | $0.75 | $0.25 | $0.03 |
| |
| Cash paid for interest | 14.1 | | | 23.4 | 23.7 | 21.0 | 19.9 | 19.3 |
| Cash paid for income taxes | 0.5 | | | | 0.0 | | | |