| 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 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F |
| Net income | 0.0 | 0.0 | 0.0 | -147.1 | -339.5 | -13.0 | 31.2 | -19.4 |
| Depreciation and amortization | | | | 372.3 | 310.0 | 300.0 | 274.6 | 198.6 |
| Deferred taxes | | | | 18.6 | -1.9 | 4.9 | -23.0 | 0.9 |
| Change in working capital | | | | -15.1 | 50.5 | 49.6 | -59.0 | -96.6 |
| Other | | | | -15.1 | 50.5 | 49.6 | -59.0 | -96.6 |
| Other operating activities | -173.2 | 36.0 | 0.4 | 52.0 | 286.1 | 55.0 | | |
| Cash from operations | -173.2 | 36.0 | 0.4 | 280.6 | 305.2 | 396.5 | 371.5 | 160.2 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | -233.7 | -533.3 | -294.6 | -664.7 | -172.2 |
| Purchases of property and equipment | | | | -233.7 | -533.3 | -294.6 | -664.7 | -172.2 |
| Sales of property and equipment | | | | 30.0 | 13.1 | 69.8 | 8.9 | 13.4 |
| Acquisitions | | | | 25.3 | | | -112.7 | 1.8 |
| Other cash from investing | | | | 2.4 | -20.0 | -55.0 | 130.4 | -12.5 |
| Cash from investing | 0.0 | 0.0 | 0.0 | -176.0 | -540.1 | -279.8 | -638.0 | -169.6 |
| |
| Cash dividends paid | | | | -46.7 | -60.6 | -78.6 | -257.9 | -214.7 |
| Issuance of common stock, net | | | | | | | | 186.4 |
| Financing costs | | | | -14.1 | -17.3 | -12.1 | -22.6 | -15.6 |
| Other cash from financing | | | | -88.8 | 186.3 | -26.9 | 508.2 | 55.2 |
| Cash from financing | 0.0 | 0.0 | 0.0 | -121.3 | 142.9 | -93.4 | 272.9 | 42.4 |
| |
| Free cash flow | -173.2 | 36.0 | 0.4 | 46.9 | -228.1 | 101.9 | -293.2 | -12.0 |
| Per share (diluted) | | | $0.00 | $0.11 | ($0.99) | $0.82 | ($2.97) | ($0.14) |