| In millions, except per share items | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -304.2 | -75.4 | -253.1 | -80.1 | -109.5 | 55.6 | 84.9 | 105.9 |
| Depreciation and amortization | 30.7 | 34.6 | 44.3 | 48.5 | 54.5 | 50.9 | 47.5 | 44.9 |
| Asset impairment charges | 4.3 | | | 1.5 | 4.5 | | | |
| Stock-based compensation | 2.9 | 3.6 | 4.9 | 5.9 | 7.5 | 7.5 | 5.8 | 5.3 |
| Tax benefit from stock-based compensation | | | | | | -0.4 | -0.1 | -1.4 |
| Deferred taxes | -1.1 | 0.9 | -2.1 | -50.5 | -56.8 | 24.4 | 10.1 | 11.2 |
| Change in working capital [+] | 29.5 | 10.6 | 10.7 | 61.1 | 112.6 | -53.4 | -13.9 | -22.2 |
| Accounts receivable | 21.6 | 1.5 | -20.5 | 24.6 | 81.4 | -9.5 | -22.0 | 8.9 |
| Inventories | 12.2 | 14.2 | 10.5 | 6.4 | 27.0 | -25.6 | 6.1 | -7.6 |
| Other current assets | | | 0.7 | 1.7 | 1.4 | -0.1 | -1.1 | -0.2 |
| Accounts payable | -4.7 | -8.8 | 11.7 | 0.6 | -7.9 | 2.1 | 4.3 | -18.2 |
| Accrued expenses | 1.2 | 3.7 | 8.7 | -8.4 | -9.1 | -2.5 | 1.7 | -10.6 |
| Income taxes | -0.8 | 0.1 | -0.4 | 36.1 | 19.8 | -17.7 | -2.8 | 5.4 |
| Other operating activities | 226.6 | 4.2 | 156.5 | -4.3 | 57.7 | 21.2 | 3.3 | 12.6 |
| Cash from operations | -11.5 | -21.6 | -38.8 | -17.9 | 70.6 | 105.8 | 137.6 | 156.4 |
| |
| Capital expenditures [+] | -2.2 | -2.0 | -2.6 | 0.0 | 0.0 | 0.0 | -99.9 | -77.2 |
| Purchases of property and equipment | -2.2 | -2.0 | -2.6 | | | | -99.9 | -77.2 |
| Sales of property and equipment | 1.1 | 27.5 | 21.6 | -6.8 | -62.7 | -161.5 | | |
| Other cash from investing | -3.1 | | | | | | | |
| Cash from investing | -4.3 | 25.5 | 19.0 | -6.8 | -62.7 | -161.5 | -99.9 | -77.2 |
| |
| Cash dividends paid | | | | | -14.7 | -29.1 | -26.4 | -23.6 |
| Repurchase of common stock, net | -0.3 | -0.4 | -0.5 | -0.5 | -0.6 | -7.0 | -7.0 | -7.9 |
| Option exercises | | | | | | | | 0.1 |
| Financing costs | -0.2 | | -1.0 | -0.3 | | | | |
| Other cash from financing | -23.5 | 1.5 | 5.8 | 36.9 | 63.0 | 25.4 | 0.1 | 1.5 |
| Cash from financing | -23.6 | 1.0 | 6.3 | 36.8 | 47.8 | -10.7 | -33.2 | -30.1 |
| |
| Free cash flow | -13.7 | -23.6 | -41.4 | -17.9 | 70.6 | 105.8 | 37.6 | 79.2 |
| Per share (diluted) | ($0.48) | ($0.87) | ($1.55) | ($0.74) | $3.07 | $4.61 | $1.64 | $3.45 |
| |
| Cash paid for interest | 6.8 | 7.7 | 2.3 | 5.3 | 2.6 | 0.1 | 0.0 | 0.1 |