| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 0.0 | -35.7 | 98.2 | -7.9 | -133.5 | 97.3 | 49.6 | 56.0 |
| Depreciation and amortization | 103.3 | 105.0 | 111.0 | 115.6 | 101.9 | 105.0 | 91.1 | 84.7 |
| Asset impairment charges | | | | | 195.1 | | | |
| Stock-based compensation | 12.7 | 9.1 | 10.5 | 4.1 | 3.3 | 3.6 | 12.4 | 4.6 |
| Tax benefit from stock-based compensation | | | | | | | | -1.4 |
| Deferred taxes | -7.9 | -9.7 | 33.5 | -0.3 | 7.1 | -40.6 | 18.3 | 16.1 |
| Change in working capital [+] | -16.4 | -25.3 | 1.0 | -68.5 | 30.2 | 11.2 | 3.5 | -19.5 |
| Accounts receivable | -16.9 | -5.3 | 6.1 | -18.0 | 6.6 | 5.6 | | |
| Inventories | -46.3 | -20.2 | 18.1 | -21.2 | -8.1 | -14.8 | | |
| Other current assets | -2.4 | -1.7 | -11.2 | -0.8 | 6.4 | -0.3 | | |
| Accounts payable | | | | | 18.9 | 31.3 | | |
| Other | 49.2 | 1.9 | -12.0 | -28.5 | 6.4 | -10.6 | 3.5 | -19.5 |
| Other operating activities | 58.5 | 53.0 | -7.2 | 12.6 | -35.2 | 2.2 | -2.1 | 19.3 |
| Cash from operations | 150.2 | 96.4 | 247.0 | 55.6 | 168.9 | 178.7 | 172.8 | 159.7 |
| |
| Capital expenditures [+] | -33.5 | -38.4 | -39.6 | -140.1 | -295.7 | -199.7 | -155.3 | -128.9 |
| Purchases of property and equipment | -33.5 | -38.4 | -39.6 | -140.1 | -295.7 | -199.7 | -155.3 | -128.9 |
| Sales of property and equipment | | 13.3 | | | 70.9 | | | 0.6 |
| Acquisitions | | | | | | | 67.4 | |
| Other cash from investing | | | | | 0.8 | 0.9 | -134.6 | 49.8 |
| Cash from investing | -33.5 | -25.1 | -39.6 | -140.1 | -224.0 | -198.8 | -222.5 | -78.5 |
| |
| Repurchase of common stock, net | -5.0 | | | | | -4.9 | -65.3 | -100.0 |
| Financing costs | | | -4.4 | -2.3 | -2.1 | -0.1 | -1.9 | |
| Other cash from financing | -83.6 | -82.0 | -197.3 | 79.7 | 61.2 | 18.6 | 130.6 | -2.9 |
| Cash from financing | -88.6 | -82.0 | -192.9 | 82.0 | 63.3 | 13.8 | 67.1 | -102.8 |
| |
| Free cash flow | 116.7 | 58.0 | 207.4 | -84.5 | -126.8 | -21.0 | 17.4 | 30.8 |
| Per share (diluted) | | $3.46 | $12.40 | ($5.11) | ($7.69) | ($1.27) | $1.02 | $1.64 |
| |
| Cash paid for interest | | 36.0 | 45.0 | 38.4 | 26.1 | 28.1 | 26.7 | 28.2 |
| Cash paid for income taxes | | -7.7 | -7.9 | 3.1 | -10.6 | | | |