| In millions, except per share items | Jun-30-23 | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 8-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | | | 34.7 | 43.7 | 35.3 | 23.2 | -76.4 | -124.5 |
| Depreciation and amortization | | | 25.9 | 25.6 | 25.1 | 24.8 | 26.7 | 28.1 |
| Asset impairment charges | | | | | | 3.6 | | 231.2 |
| Stock-based compensation | | | -3.0 | 0.9 | 0.0 | 6.7 | 5.0 | 3.8 |
| Deferred taxes | | | -4.9 | -0.2 | 0.0 | 75.8 | 36.3 | 42.0 |
| Change in working capital [+] | | | -30.4 | -11.8 | -29.2 | -12.6 | -2.9 | 30.2 |
| Accounts receivable | | | -27.6 | -34.1 | -29.2 | -18.7 | -13.4 | 50.0 |
| Other current assets | | | 7.4 | 23.6 | 0.0 | -10.1 | -5.9 | 5.3 |
| Accounts payable | | | | | 0.0 | 26.2 | 26.4 | -4.8 |
| Other operating activities | | | 40.0 | 19.1 | 18.6 | -79.1 | -84.5 | -179.8 |
| Cash from operations | | | 65.8 | 80.8 | 53.4 | 42.4 | 37.5 | 31.0 |
| |
| Capital expenditures [+] | | | 23.2 | 9.6 | 9.6 | 7.4 | 11.9 | 10.1 |
| Purchases of property and equipment | | | 23.2 | 9.6 | 9.6 | 7.4 | 11.9 | 10.1 |
| Sales of property and equipment | | | 0.2 | 0.3 | | | 0.3 | 0.1 |
| Purchases of intangible assets | | | | | 0.0 | | 0.3 | 0.3 |
| Other cash from investing | | | -39.0 | | -19.0 | -18.9 | | |
| Cash from investing | | | -14.6 | -8.7 | -9.1 | -9.9 | -8.1 | -9.8 |
| |
| Repurchase of common stock, net | | | -4.9 | | | | | |
| Financing costs | | | 5.1 | | 1.3 | | | -1.3 |
| Other cash from financing | | | -42.1 | -64.1 | -41.1 | -31.9 | -33.5 | -26.7 |
| Cash from financing | | | -52.1 | -66.7 | -42.4 | -30.6 | -32.2 | -25.4 |
| |
| Free cash flow | | | 89.0 | 90.4 | 63.0 | 49.8 | 49.4 | 41.1 |
| Per share (diluted) | | | $4.16 | $4.23 | $2.95 | $2.34 | $2.33 | $1.95 |
| |
| Cash paid for interest | | | 17.4 | 18.9 | 19.4 | 19.5 | 19.9 | 19.7 |
| Cash paid for income taxes | | | -12.8 | -20.3 | 0.5 | | 3.1 | 2.8 |