| In millions, except per share items | Dec-31-19 | Sep-30-19 | Jun-30-19 | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 |
| | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | -304.2 | -87.2 | -74.5 | -73.2 | -75.4 | -71.2 | -232.9 | -242.9 |
| Depreciation and amortization | 30.7 | 31.5 | 32.1 | 33.4 | 34.6 | 36.0 | 38.9 | 40.9 |
| Stock-based compensation | 2.9 | 2.9 | 2.9 | 3.5 | 3.6 | 4.1 | 4.4 | 4.4 |
| Deferred taxes | -1.1 | 1.2 | | | 0.9 | -2.4 | | -3.4 |
| Change in working capital [+] | 29.5 | 31.6 | 30.2 | 13.7 | 10.6 | 7.4 | 9.9 | 18.1 |
| Accounts receivable | 21.6 | 14.9 | 16.9 | 5.3 | 1.5 | -6.1 | -10.2 | -12.5 |
| Inventories | 12.2 | 14.9 | 19.2 | 18.4 | 14.2 | 10.1 | 6.7 | 10.0 |
| Other current assets | | 1.7 | 0.3 | 1.8 | | 1.1 | 0.9 | 0.0 |
| Accounts payable | -4.7 | -5.7 | -6.1 | -9.4 | -8.8 | -1.2 | 9.1 | 14.2 |
| Accrued expenses | 1.2 | 6.6 | 0.1 | -2.2 | 3.7 | 2.7 | 2.5 | 5.3 |
| Income taxes | -0.8 | -0.8 | 0.0 | 0.0 | 0.1 | 0.8 | 0.9 | 1.1 |
| Other | -1.7 | | | | -0.1 | | | |
| Other operating activities | 230.8 | 16.0 | 2.6 | 3.5 | 4.2 | 2.5 | 154.4 | 156.2 |
| Cash from operations | -11.5 | -4.1 | -5.9 | -18.1 | -21.6 | -23.6 | -28.2 | -26.8 |
| |
| Capital expenditures [+] | -2.2 | -2.6 | -1.9 | -2.3 | -2.0 | -2.2 | -3.8 | -3.0 |
| Purchases of property and equipment | -2.2 | -2.6 | -1.9 | -2.3 | -2.0 | -2.2 | -3.8 | -3.0 |
| Sales of property and equipment | 1.1 | 23.1 | 27.6 | 27.6 | 27.5 | 5.3 | 22.9 | 22.3 |
| Other cash from investing | -3.1 | -1.6 | -1.2 | | | | | |
| Cash from investing | -4.3 | 19.0 | 24.4 | 25.3 | 25.5 | 3.2 | 19.1 | 19.3 |
| |
| Repurchase of common stock, net | | | | -0.3 | | | | -0.4 |
| Financing costs | | | -0.2 | | | | | |
| Other cash from financing | -23.5 | -23.1 | -22.6 | 4.7 | 1.5 | 1.5 | 13.7 | 10.9 |
| Cash from financing | -23.6 | -23.2 | -22.7 | 4.4 | 1.0 | 1.1 | 13.4 | 10.6 |
| |
| Free cash flow | -13.7 | -6.7 | -7.8 | -20.4 | -23.6 | -25.7 | -31.9 | -29.8 |
| Per share (diluted) | ($0.48) | ($0.24) | ($0.28) | ($0.75) | ($0.88) | ($0.96) | ($1.19) | ($1.12) |
| |
| Cash paid for interest | 6.8 | 7.7 | 8.3 | 7.7 | 7.7 | 6.8 | 5.4 | 4.5 |