| 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-25-16 | Dec-27-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 37.0 | 3.8 | -243.6 | -96.5 | 26.0 | -6.2 | 41.4 | 23.9 |
| Depreciation and amortization [+] | 91.2 | 99.6 | 98.2 | 100.7 | 95.1 | 69.3 | 34.3 | 34.5 |
| Depreciation | 91.2 | 99.6 | 98.2 | 100.7 | 95.1 | 69.3 | 34.3 | 34.5 |
| Asset impairment charges | | | 193.6 | 102.2 | | | | |
| Stock-based compensation | | | 2.4 | 5.7 | 2.1 | 2.6 | 3.6 | 2.8 |
| Deferred taxes | -9.3 | -2.0 | 7.5 | -3.5 | -1.0 | -3.4 | -4.7 | |
| Change in working capital [+] | 15.1 | -0.3 | 70.9 | 42.6 | 32.1 | 1.0 | -3.2 | 1.0 |
| Accounts receivable | | | 28.1 | 26.7 | 42.8 | 4.6 | 8.0 | -14.0 |
| Inventories | | | 20.9 | 5.3 | -6.1 | -1.3 | -22.3 | 11.5 |
| Accounts payable | | | 24.5 | 7.5 | -9.1 | 1.4 | 15.9 | -1.1 |
| Income taxes | 15.1 | -0.3 | -2.5 | 3.1 | 4.6 | -3.8 | | |
| Other | | | | | | | -4.7 | 4.7 |
| Other operating activities | 18.5 | -56.3 | 21.1 | 11.6 | 1.9 | 0.4 | 7.1 | -3.0 |
| Cash from operations | 152.6 | 44.9 | 150.1 | 162.8 | 156.1 | 63.7 | 78.5 | 59.3 |
| |
| Capital expenditures [+] | 57.2 | 64.1 | -45.0 | -64.3 | -77.7 | -70.9 | -39.6 | -39.5 |
| Purchases of property and equipment | 57.2 | 64.1 | -45.0 | -64.3 | -77.7 | -70.9 | -39.6 | -39.5 |
| Sales of property and equipment | 0.2 | 6.6 | 0.9 | | | | 4.3 | 1.8 |
| Acquisitions | | | | | | -706.7 | | |
| Sales of short-term investments, net [+] | | | | | 0.6 | | 0.2 | 2.8 |
| Purchases of short-term investments | | | | | | | | -1.0 |
| Sales of short-term investments | | | | | 0.6 | | 0.2 | 3.8 |
| Other cash from investing | -114.3 | -128.2 | | 9.6 | | 0.1 | | 0.0 |
| Cash from investing | -57.0 | -57.5 | -44.2 | -54.7 | -77.1 | -777.6 | -35.0 | -34.9 |
| |
| Cash dividends paid | | | -13.6 | -22.6 | -28.8 | -19.5 | -18.3 | -19.1 |
| Repurchase of common stock, net | | | | | | -5.0 | -20.7 | -19.6 |
| Option exercises | | | | | 0.1 | 0.0 | 1.6 | 7.3 |
| Financing costs | | | | | | -31.6 | | |
| Other cash from financing | 4.5 | -24.0 | -23.5 | -54.0 | -47.5 | 694.0 | 3.4 | 14.6 |
| Cash from financing | 4.5 | -24.0 | -37.1 | -76.6 | -76.3 | 701.1 | -37.3 | -31.3 |
| |
| Free cash flow | 209.7 | 109.0 | 105.1 | 98.5 | 78.4 | -7.2 | 38.9 | 19.8 |
| Per share (diluted) | $7,601.56 | $4,193.04 | $4.12 | $3.93 | $3.12 | ($0.29) | $1.52 | $0.74 |