| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -3.0 | -101.0 | 70.0 | 171.0 | -30.0 | 0.0 | -422.0 | -353.0 |
| Depreciation and amortization | 154.0 | 153.0 | 183.0 | 111.0 | 115.0 | | 308.0 | 91.0 |
| Asset impairment charges | | | | | | | | 6.0 |
| Stock-based compensation | 5.0 | 5.0 | 12.0 | 8.0 | 1.0 | | | 2.0 |
| Deferred taxes | -3.0 | -9.0 | -91.0 | | -8.0 | | 4.0 | |
| Change in working capital [+] | 38.0 | 2.0 | -178.0 | -20.0 | -2.0 | | 96.0 | 74.0 |
| Accounts receivable | -23.0 | 32.0 | 44.0 | 11.0 | -13.0 | | | 17.0 |
| Inventories | 92.0 | 79.0 | -7.0 | -12.0 | 60.0 | | | 17.0 |
| Accounts payable | 13.0 | -64.0 | -34.0 | 40.0 | 67.0 | | | -22.0 |
| Other | -44.0 | -45.0 | -181.0 | -59.0 | -116.0 | | 96.0 | 62.0 |
| Other operating activities | -11.0 | -112.0 | 129.0 | 13.0 | 77.0 | | -252.0 | 122.0 |
| Cash from operations | 180.0 | -62.0 | 125.0 | 283.0 | 153.0 | 0.0 | -266.0 | -58.0 |
| |
| Capital expenditures [+] | -66.0 | -48.0 | -105.0 | -73.0 | -40.0 | 0.0 | -64.0 | -42.0 |
| Purchases of property and equipment | -66.0 | -48.0 | -105.0 | -73.0 | -40.0 | | -64.0 | -42.0 |
| Sales of property and equipment | 2.0 | 6.0 | 1.0 | 17.0 | | | 51.0 | 1.0 |
| Other cash from investing | 22.0 | 345.0 | | 4.0 | | | 124.0 | 16.0 |
| Cash from investing | -42.0 | 303.0 | -104.0 | -52.0 | -40.0 | 0.0 | 111.0 | -25.0 |
| |
| Cash dividends paid | -12.0 | -111.0 | | | | | | |
| Repurchase of common stock, net | -80.0 | -34.0 | -3.0 | | | | | |
| Financing costs | | | -1.0 | | | | | -2.0 |
| Other cash from financing | -11.0 | -1.0 | -3.0 | -212.0 | -113.0 | | 153.0 | 76.0 |
| Cash from financing | -103.0 | -146.0 | -5.0 | -212.0 | -113.0 | 0.0 | 153.0 | 78.0 |
| |
| Free cash flow | 114.0 | -110.0 | 20.0 | 210.0 | 113.0 | 0.0 | -330.0 | -100.0 |
| Per share (diluted) | $3.69 | ($3.21) | $0.57 | $5.98 | $3.28 | | ($4.06) | ($1.88) |
| |
| Cash paid for interest | 1.0 | 1.0 | 2.0 | 16.0 | 30.0 | | 246.0 | 117.0 |
| Cash paid for income taxes | | | 3.0 | | | | | |