| 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 | 20-F | 20-F |
| Net income | 93.1 | 47.9 | 35.2 | 54.4 | 46.5 | 9.6 | 15.7 | 18.7 |
| Depreciation and amortization [+] | 8.9 | 8.4 | 8.0 | 7.7 | 6.2 | 6.6 | 9.6 | 4.0 |
| Depreciation | 6.5 | 5.9 | 5.4 | 5.1 | 3.6 | 4.0 | 4.6 | 4.0 |
| Amortization of intangible assets | 2.5 | 2.5 | 2.6 | 2.6 | 2.6 | 2.5 | 5.0 | |
| Asset impairment charges | | | | | | 0.2 | | |
| Stock-based compensation | 10.5 | 6.9 | 5.1 | 4.3 | 2.8 | 2.7 | 2.7 | 2.1 |
| Deferred taxes | -3.0 | -0.2 | -0.7 | -1.9 | 0.0 | 0.6 | -5.0 | -1.6 |
| Change in working capital [+] | 17.2 | -10.3 | -4.7 | -24.7 | 8.6 | -21.8 | 2.4 | 10.0 |
| Accounts receivable | -5.1 | -11.7 | 1.9 | -12.5 | 1.7 | -23.6 | -2.0 | 12.4 |
| Inventories | -18.5 | -16.3 | -7.5 | -8.1 | -6.9 | -1.7 | -1.9 | 2.2 |
| Accounts payable | 11.7 | 3.3 | 1.7 | 3.3 | -0.7 | 2.1 | 1.6 | -4.0 |
| Deferred revenues | 10.6 | 2.5 | -1.7 | -6.4 | 6.3 | -1.8 | 1.4 | -0.7 |
| Other | 18.5 | 11.9 | 1.0 | -1.0 | 8.2 | 3.0 | 3.3 | 0.1 |
| Other operating activities | 5.5 | 7.5 | -2.3 | -2.6 | -2.2 | -2.1 | 0.4 | |
| Cash from operations | 132.3 | 60.3 | 40.7 | 37.1 | 61.8 | -4.2 | 25.8 | 33.5 |
| |
| Capital expenditures | -4.8 | -6.4 | -21.3 | -3.7 | -6.3 | -3.1 | -4.4 | -5.2 |
| Purchases of property and equipment | -4.8 | -6.4 | -21.3 | -3.7 | -6.3 | -3.1 | -4.4 | -5.2 |
| Acquisitions | | | | | | | -45.3 | |
| Purchases of short-term investments, net | -202.2 | | | | | | | |
| Purchases of short-term investments | -215.1 | | | | | | | |
| Sales of short-term investments | 12.9 | | | | | | | |
| Other cash from investing | -31.5 | -36.0 | -4.2 | -33.0 | -50.8 | -1.2 | 40.0 | -28.1 |
| Cash from investing | -238.5 | -42.5 | -25.5 | -36.7 | -57.1 | -4.4 | -9.7 | -33.3 |
| |
| Repurchase of common stock, net | | -12.5 | -7.2 | -4.8 | | -0.9 | -4.3 | -6.7 |
| Option exercises | 0.0 | 0.4 | 0.5 | 0.4 | 2.6 | 2.2 | 2.3 | |
| Other cash from financing | 0.0 | 194.3 | 1.0 | 0.7 | 5.2 | 4.3 | 4.6 | 2.6 |
| Cash from financing | 0.0 | 181.4 | -6.7 | -4.4 | 2.6 | 1.2 | -2.0 | -4.1 |
| |
| Free cash flow | 127.4 | 53.8 | 19.4 | 33.4 | 55.5 | -7.3 | 21.4 | 28.3 |
| Per share (diluted) | $4.27 | $1.86 | $0.68 | $1.16 | $1.95 | ($0.27) | $0.78 | $1.02 |
| |
| Cash paid for income taxes | 13.3 | 4.0 | 8.3 | 13.0 | 8.2 | 1.9 | 0.1 | 0.1 |