| 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 | 23.2 | -92.7 | -374.1 | 22.0 | 49.4 | 116.6 | 86.3 | 54.5 |
| Depreciation and amortization | 52.5 | 53.8 | 56.6 | 59.0 | 56.8 | 55.1 | 42.7 | 35.2 |
| Asset impairment charges | | | | | 0.0 | -29.1 | 0.2 | 0.1 |
| Stock-based compensation | | | | | 4.9 | 11.0 | 8.0 | 3.8 |
| Tax benefit from stock-based compensation | | | | | | | -0.1 | -0.4 |
| Deferred taxes | | | | | 5.4 | 26.0 | 7.7 | 0.5 |
| Change in working capital [+] | 10.6 | 26.1 | 51.0 | 7.8 | -30.6 | 5.2 | -11.2 | -13.9 |
| Accounts receivable | | | | | -6.2 | -2.3 | -9.4 | -16.7 |
| Inventories | | | | | -1.6 | 0.1 | 0.1 | 4.9 |
| Accounts payable | | | | | -1.6 | 7.5 | 1.8 | -2.6 |
| Income taxes | -0.7 | 21.9 | 77.4 | 0.9 | -8.3 | 5.0 | -3.4 | -0.9 |
| Other | 11.3 | 4.2 | -26.4 | 6.9 | -12.8 | -5.2 | -0.4 | 1.5 |
| Other operating activities | -12.9 | -25.0 | 186.3 | 19.4 | 4.8 | -72.6 | -33.3 | -19.6 |
| Cash from operations | 73.4 | -37.9 | -80.2 | 108.1 | 90.6 | 112.2 | 100.3 | 60.3 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | 0.0 | -83.3 | -56.6 | -49.8 | -29.8 |
| Purchases of property and equipment | | | | | -83.3 | -56.6 | -49.8 | -29.8 |
| Sales of property and equipment | 0.5 | 14.4 | 22.0 | 1.6 | 0.9 | 0.9 | 1.2 | 1.5 |
| Acquisitions | 25.5 | 8.2 | | 91.0 | -4.6 | -1.5 | -196.0 | -0.4 |
| Other cash from investing | -89.2 | -74.4 | -28.8 | -258.1 | | 31.6 | | |
| Cash from investing | -63.3 | -51.8 | -6.8 | -165.6 | -87.0 | -25.6 | -244.6 | -28.7 |
| |
| Cash dividends paid | | | 4.1 | 8.1 | -8.2 | -8.2 | -8.1 | -8.0 |
| Repurchase of common stock, net | | | 2.8 | | -17.2 | | -0.7 | -4.8 |
| Option exercises | | | 2.1 | 0.3 | 0.1 | | | 1.0 |
| Financing costs | 0.4 | 1.8 | 1.6 | 0.0 | -1.8 | 0.0 | -0.3 | |
| Other cash from financing | -5.7 | 109.7 | 63.1 | 65.7 | 13.7 | -47.9 | 120.1 | -11.4 |
| Cash from financing | -6.1 | 107.9 | 66.3 | 73.5 | -9.9 | -56.1 | 111.6 | -25.3 |
| |
| Free cash flow | 73.4 | -37.9 | -80.2 | 108.1 | 7.3 | 55.6 | 50.5 | 30.4 |
| Per share (diluted) | $3.53 | ($1.85) | ($3.96) | $5.33 | $0.36 | $2.72 | $2.50 | $1.52 |
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