| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -26.1 | -27.7 | -240.1 | -46.7 | -263.0 | 162.2 | -2.8 | -30.9 |
| Depreciation and amortization | 47.2 | 46.2 | 45.7 | 44.9 | 43.0 | 52.4 | 50.7 | 33.0 |
| Stock-based compensation | 4.4 | 3.2 | 4.2 | | | | | |
| Deferred taxes | -1.8 | -4.8 | -21.7 | -3.1 | -22.4 | -23.2 | -15.5 | -19.1 |
| Change in working capital [+] | -8.5 | -6.2 | 18.0 | -5.8 | 22.1 | 106.6 | -6.5 | -6.3 |
| Accounts receivable | -4.9 | 13.7 | 10.8 | 1.3 | -3.5 | -11.4 | -18.5 | -2.5 |
| Inventories | -6.7 | -13.0 | 5.1 | 1.4 | -16.2 | -8.9 | 4.4 | -1.8 |
| Other current assets | | | | | | | 7.6 | -0.1 |
| Accounts payable | 8.6 | 0.3 | -8.6 | -7.9 | 2.7 | 4.1 | | -8.0 |
| Other | -5.5 | -7.3 | 10.7 | -0.6 | 39.1 | 122.8 | | 6.1 |
| Other operating activities | -7.5 | 4.9 | 209.4 | 60.0 | 261.2 | -326.3 | 43.5 | 56.7 |
| Cash from operations | 7.7 | 15.6 | 15.5 | 49.2 | 40.9 | -28.2 | 69.4 | 33.3 |
| |
| Capital expenditures [+] | -18.0 | -18.2 | -23.8 | -54.0 | -64.0 | -43.7 | -43.8 | -38.6 |
| Purchases of property and equipment | -18.0 | -18.2 | -23.8 | -54.0 | -64.0 | -43.7 | -43.8 | -38.6 |
| Sales of property and equipment | 0.5 | 1.4 | 3.3 | 7.3 | 1.4 | 0.6 | | 3.0 |
| Acquisitions | | | | | -399.0 | -38.4 | | -628.3 |
| Other cash from investing | | -19.3 | 739.7 | 7.3 | 0.3 | 364.0 | 2.6 | -2.0 |
| Cash from investing | -17.5 | -36.1 | 719.3 | -39.4 | -461.3 | 282.5 | -41.2 | -665.8 |
| |
| Cash dividends paid | | | | -8.9 | -8.8 | -7.7 | -7.6 | -6.4 |
| Issuance of common stock, net | | | | | 217.3 | | | 173.1 |
| Option exercises | | | | | 0.3 | 3.3 | 2.9 | 2.0 |
| Financing costs | | | | | | | | -35.2 |
| Other cash from financing | -5.2 | 2.6 | -714.9 | 14.2 | 6.9 | -34.8 | -14.0 | 411.9 |
| Cash from financing | -5.2 | 2.6 | -714.9 | 5.3 | 215.1 | -45.8 | -24.5 | 611.6 |
| |
| Free cash flow | -10.2 | -2.6 | -8.2 | -4.8 | -23.1 | -72.0 | 25.5 | -5.2 |
| Per share (diluted) | ($0.23) | ($0.06) | ($0.19) | ($0.11) | ($0.73) | ($2.59) | $0.95 | ($0.25) |
| |
| Cash paid for interest | 13.3 | 10.7 | 51.5 | 50.5 | 56.2 | 52.1 | 59.2 | 20.1 |