| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | S-1/A | S-1/A |
| Net income | 34.3 | 16.1 | 6.9 | 60.7 | 43.8 | 32.1 | 25.0 | 30.4 |
| Depreciation and amortization | 18.1 | 18.8 | 22.8 | 14.6 | 13.5 | 9.2 | 8.8 | |
| Asset impairment charges | | 14.2 | 26.2 | | | | | |
| Deferred taxes | -0.4 | -2.2 | -2.2 | 2.3 | -0.5 | -1.1 | -0.1 | -0.7 |
| Change in working capital [+] | -5.2 | 11.6 | 1.7 | 1.7 | 4.0 | 0.1 | -3.2 | 0.6 |
| Accounts receivable | -4.0 | 4.5 | 10.7 | 6.2 | -4.8 | -4.6 | 0.1 | -1.9 |
| Inventories | -3.8 | 3.1 | 3.8 | 3.6 | 1.6 | -1.4 | -0.7 | 0.8 |
| Accounts payable | 1.8 | -0.7 | -1.1 | -3.8 | 3.8 | 5.9 | -1.2 | 0.9 |
| Deferred revenues | 0.3 | -5.4 | -7.4 | -3.5 | 2.2 | -1.1 | -0.2 | 0.7 |
| Other | 0.5 | 10.0 | -4.3 | -0.8 | 1.1 | 1.3 | -1.2 | |
| Other operating activities | 9.1 | 1.6 | 4.4 | -26.0 | -16.8 | 1.2 | 5.4 | 7.4 |
| Cash from operations | 55.8 | 60.1 | 59.7 | 53.3 | 43.9 | 41.5 | 35.9 | 37.7 |
| |
| Capital expenditures [+] | -16.6 | -10.2 | -18.3 | -21.7 | -16.2 | -13.6 | -18.7 | -15.0 |
| Purchases of property and equipment | -16.6 | -10.2 | -18.3 | -21.7 | -16.2 | -13.6 | -18.7 | -15.0 |
| Sales of property and equipment | 0.9 | 0.2 | 0.2 | 0.4 | 0.3 | 0.3 | 0.4 | 0.5 |
| Acquisitions | | | | | | | | -0.5 |
| Sales of short-term investments, net [+] | | 0.3 | 1.3 | 1.5 | -3.3 | 1.5 | 0.0 | |
| Purchases of short-term investments | | | -1.1 | -8.1 | -8.6 | -3.2 | 0.0 | |
| Sales of short-term investments | | 0.3 | 2.4 | 9.6 | 5.4 | 4.6 | | |
| Other cash from investing | -2.8 | -1.7 | -1.5 | -65.0 | 4.4 | -8.0 | -7.4 | 1.7 |
| Cash from investing | -18.5 | -11.5 | -18.3 | -84.9 | -14.7 | -19.9 | -25.7 | -13.2 |
| |
| Cash dividends paid | -15.8 | -10.0 | -19.8 | -20.2 | -22.6 | -17.1 | -17.6 | -19.3 |
| Repurchase of common stock, net | -7.3 | | -6.0 | | | | | |
| Other cash from financing | -35.6 | -19.5 | -13.1 | 70.0 | -1.6 | -1.1 | -1.1 | -3.1 |
| Cash from financing | -58.7 | -29.4 | -38.9 | 49.8 | -24.3 | -18.2 | -18.7 | -22.4 |
| |
| Free cash flow | 39.2 | 49.8 | 41.4 | 31.5 | 27.7 | 27.8 | 17.2 | 22.8 |
| Per share (diluted) | $1.89 | $2.39 | $1.97 | $1.50 | $1.32 | $1.33 | $0.82 | $1.09 |
| |
| Cash paid for interest | 1.0 | 2.0 | 1.8 | 1.3 | 2.7 | 0.3 | 0.2 | |
| Cash paid for income taxes | 13.5 | 14.4 | 10.4 | 15.5 | 22.9 | 17.7 | 10.2 | |