| In millions, except per share items | Aug-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K |
| Net income | -67.5 | -229.5 | 18.3 | 47.9 |
| Depreciation and amortization | 47.4 | 84.7 | 80.4 | 85.8 |
| Stock-based compensation | 1.4 | 3.3 | 6.1 | 3.7 |
| Change in working capital | 7.5 | 6.4 | 8.9 | -1.5 |
| Other | 7.5 | 6.4 | 8.9 | -1.5 |
| Other operating activities | 44.4 | 231.8 | 17.2 | 2.3 |
| Cash from operations | 33.2 | 96.7 | 130.9 | 138.2 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | -2.7 |
| Purchases of property and equipment | | | | -2.7 |
| Sales of property and equipment | 32.7 | 76.9 | 146.6 | |
| Other cash from investing | 30.5 | -110.6 | -18.6 | 85.6 |
| Cash from investing | 63.2 | -33.8 | 128.1 | 82.9 |
| |
| Cash dividends paid | | -198.0 | -944.2 | |
| Financing costs | | -9.6 | -11.2 | 0.0 |
| Other cash from financing | -142.1 | 264.1 | 727.8 | -218.7 |
| Cash from financing | -142.1 | 75.7 | -205.2 | -218.7 |
| |
| Free cash flow | 33.2 | 96.7 | 130.9 | 135.5 |
| Per share (diluted) | $0.77 | $2.26 | $3.05 | $3.16 |
| |
| Cash paid for interest | | 101.4 | 69.4 | 73.7 |