| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-05-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 8-K | 10-K | 10-K | 10-K/A |
| Net income | 66.7 | 49.2 | -95.1 | 44.0 | 88.0 | 46.4 | -381.8 | 87.5 |
| Depreciation and amortization [+] | 47.2 | 41.1 | 38.3 | 41.7 | 41.7 | 43.7 | 64.7 | 61.9 |
| Depreciation | 29.3 | 29.4 | 26.9 | 28.5 | | 29.9 | 44.7 | 38.5 |
| Amortization | 17.9 | 11.7 | 11.4 | 13.2 | | 13.8 | 20.0 | 23.4 |
| Asset impairment charges | | 3.2 | 11.2 | 14.4 | 14.4 | 4.9 | 461.9 | 22.7 |
| Stock-based compensation | 14.2 | 9.5 | 12.5 | 14.1 | 14.1 | 14.6 | 18.9 | 5.4 |
| Deferred taxes | 22.0 | 27.5 | 11.4 | 9.4 | 9.4 | -30.8 | -102.0 | -25.4 |
| Change in working capital [+] | -52.9 | -11.0 | 11.7 | -68.0 | -30.2 | 33.8 | -143.8 | 30.0 |
| Accounts receivable | -26.1 | 26.4 | 61.6 | -27.1 | | 19.3 | 13.7 | 47.4 |
| Inventories | -39.3 | 18.9 | 10.1 | -30.2 | -30.2 | -3.2 | 18.4 | -2.5 |
| Other | 12.5 | -56.3 | -60.0 | -10.7 | | 17.7 | -175.9 | -14.9 |
| Other operating activities | -27.5 | 0.8 | 140.1 | -27.6 | -292.4 | 2.4 | 54.2 | 31.5 |
| Cash from operations | 69.7 | 120.3 | 130.1 | 28.0 | -155.0 | 115.0 | -27.9 | 213.6 |
| |
| Capital expenditures [+] | -32.6 | -22.4 | -28.5 | -19.2 | -19.2 | -16.2 | -44.0 | -57.0 |
| Purchases of property and equipment | -32.6 | -22.4 | -28.5 | -19.2 | -19.2 | -16.2 | -44.0 | -57.0 |
| Sales of property and equipment | 4.1 | 5.8 | 5.0 | | | 37.4 | 4.0 | 12.5 |
| Acquisitions | -102.3 | -10.0 | | | | | | |
| Other cash from investing | 8.0 | 400.3 | -7.5 | -6.3 | -6.3 | -3.2 | | -0.3 |
| Cash from investing | -122.8 | 373.7 | -31.0 | -25.5 | -25.5 | 18.0 | -40.0 | -44.8 |
| |
| Cash dividends paid | -11.4 | -2.8 | -1.2 | | | | | |
| Repurchase of common stock, net | -40.2 | -19.9 | | | | | | |
| Option exercises | 17.6 | | | | | | | |
| Financing costs | -2.9 | | -3.3 | | | | -15.5 | -6.2 |
| Other cash from financing | 1.9 | -339.0 | -57.9 | -136.3 | -136.3 | -218.6 | 5.6 | -74.3 |
| Cash from financing | -64.4 | -361.7 | -55.8 | -136.3 | -136.3 | -218.6 | 21.1 | -68.1 |
| |
| Free cash flow | 37.1 | 97.9 | 101.6 | 8.8 | -174.2 | 98.8 | -71.9 | 156.6 |
| Per share (diluted) | $0.88 | $2.30 | $2.38 | $0.21 | ($4.09) | $2.34 | ($1.74) | $3.82 |
| |
| Cash paid for interest | 23.5 | 39.8 | 42.7 | 49.9 | | 62.6 | 57.4 | 5.8 |
| Cash paid for income taxes | 45.6 | 28.1 | 33.6 | 23.8 | | 25.9 | 43.4 | 35.9 |