| In millions, except per share items | Dec-05-22 | Dec-05-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-15 | Dec-31-14 |
| | 8-K | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -3.4 | -110.3 | -276.7 | 455.7 | -141.5 | -149.8 | 17.2 | 92.9 |
| Depreciation and amortization [+] | 44.4 | 56.2 | 69.2 | 75.5 | 76.8 | 78.6 | | 126.6 |
| Depreciation | 44.4 | 56.2 | 69.2 | 73.8 | 70.4 | 73.9 | | 126.6 |
| Amortization of intangible assets | | | | 1.6 | 6.3 | 4.7 | | |
| Stock-based compensation | 0.1 | 0.4 | 1.6 | 1.0 | 7.2 | 4.0 | | |
| Deferred taxes | 0.7 | 0.4 | 0.2 | -0.1 | 1.7 | -2.0 | | -0.3 |
| Change in working capital [+] | -7.7 | -13.3 | -11.6 | -15.7 | 9.0 | -8.8 | -17.0 | 3.4 |
| Restricted cash | | | | | | | | 2.1 |
| Accounts receivable | -42.2 | -20.1 | 21.8 | -18.1 | 16.9 | -24.5 | | 12.4 |
| Inventories | | | -1.9 | -3.2 | 1.9 | 1.3 | | -10.1 |
| Other current assets | -9.9 | -3.3 | -1.2 | 0.8 | -6.1 | 1.3 | | -4.7 |
| Accounts payable | 44.5 | 10.1 | -23.7 | 5.2 | 4.7 | 4.4 | | -40.6 |
| Accrued expenses | | | | | | | -17.0 | 44.2 |
| Other | | | -6.6 | -0.5 | -8.5 | 8.8 | | |
| Other operating activities | -53.1 | -3.8 | 132.0 | 19.3 | 59.6 | 58.1 | 92.4 | 17.2 |
| Cash from operations | -18.9 | -70.4 | -85.3 | 535.6 | 12.8 | -19.9 | 92.6 | 239.7 |
| |
| Capital expenditures | -10.3 | -7.0 | -3.2 | -7.8 | -14.3 | -2.2 | -46.5 | -35.7 |
| Purchases of property and equipment | -10.3 | -7.0 | -3.2 | -7.8 | -14.3 | -2.2 | -46.5 | -35.7 |
| Other cash from investing | 201.8 | 13.6 | | | -80.3 | -12.7 | | |
| Cash from investing | 191.5 | 6.5 | -3.2 | -7.8 | -94.6 | -15.0 | -46.5 | -35.7 |
| |
| Cash dividends paid | | | | -525.0 | | | | -1.0 |
| Financing costs | | | | -0.5 | -7.7 | | | |
| Other cash from financing | -170.0 | | | 0.2 | 118.1 | -1.4 | 81.5 | -177.6 |
| Cash from financing | -170.0 | 0.0 | 0.0 | -524.3 | 125.8 | -1.4 | 81.5 | -178.6 |
| |
| Free cash flow | -29.2 | -77.4 | -88.5 | 527.8 | -1.5 | -22.1 | 46.1 | 204.0 |
| Per share (diluted) | ($2.22) | ($5.90) | ($6.74) | $92.98 | ($0.30) | ($4.42) | | |
| |
| Cash paid for interest | | | 32.4 | 31.1 | 22.5 | 15.6 | | 194.6 |
| Cash paid for income taxes | | | 7.8 | 13.5 | 14.9 | 17.7 | 50.8 | |