| In millions, except per share items | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 |
| | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F | 20-F |
| Net income | 112.2 | 114.6 | 86.6 | 81.0 | 90.8 | 52.9 | -64.2 |
| Depreciation and amortization | 46.4 | 44.7 | 41.7 | 34.0 | 29.2 | 24.0 | 31.0 |
| Stock-based compensation | 21.6 | 15.5 | 13.3 | 10.2 | 9.2 | 9.3 | 13.0 |
| Deferred taxes | -1.4 | 4.8 | 3.2 | 2.3 | 0.1 | -3.2 | -23.4 |
| Change in working capital [+] | -41.3 | -0.5 | -28.5 | -31.1 | -8.4 | -15.2 | -14.5 |
| Accounts receivable | -33.5 | -28.2 | -27.3 | -14.4 | -11.5 | -10.6 | -7.2 |
| Inventories | -4.5 | 3.6 | -3.2 | -26.8 | -2.8 | -7.8 | 7.9 |
| Other current assets | 0.0 | 0.0 | 0.2 | -0.2 | 0.7 | 0.5 | 0.3 |
| Accounts payable | 2.0 | 9.5 | 1.6 | 5.0 | 2.0 | -0.9 | -5.3 |
| Accrued expenses | 0.3 | 0.0 | -0.2 | -0.3 | -1.1 | 0.5 | -0.8 |
| Deferred revenues | -1.8 | 10.8 | 1.2 | 6.3 | 4.1 | 1.2 | -14.7 |
| Other | -3.9 | 3.8 | -0.8 | -0.8 | 0.4 | 1.9 | 5.4 |
| Other operating activities | -134.0 | -173.9 | -116.0 | -94.5 | -97.8 | -70.7 | 118.7 |
| Cash from operations | 3.4 | 5.2 | 0.3 | 1.9 | 23.2 | -3.0 | 60.7 |
| |
| Capital expenditures [+] | -98.1 | -57.5 | -66.9 | -79.3 | -48.9 | -55.0 | -63.3 |
| Purchases of property and equipment | -98.1 | -57.5 | -66.9 | -79.3 | -48.9 | -55.0 | -63.3 |
| Sales of property and equipment | 4.5 | 18.3 | 0.1 | 0.1 | 0.0 | 0.0 | 0.2 |
| Purchases of intangible assets | -10.0 | -2.7 | -1.0 | -0.6 | -0.5 | -0.3 | -0.7 |
| Acquisitions | -23.9 | -0.8 | | -12.6 | | -13.5 | -142.3 |
| Purchases of short-term investments, net | 98.7 | -119.3 | -46.3 | -84.6 | -14.8 | -7.3 | -14.4 |
| Purchases of short-term investments | -372.9 | -491.9 | -305.6 | -280.8 | -118.2 | -54.2 | -14.4 |
| Sales of short-term investments | 471.6 | 372.6 | 259.3 | 196.2 | 103.4 | 46.8 | |
| Other cash from investing | 109.2 | 156.6 | 199.0 | 150.0 | 50.2 | 67.4 | 5.3 |
| Cash from investing | 80.4 | -5.3 | 84.9 | -27.0 | -14.0 | -8.7 | -215.2 |
| |
| Repurchase of common stock, net | -98.9 | -1.2 | -30.0 | | | | |
| Option exercises | 2.2 | 4.9 | 1.4 | 1.6 | 2.4 | 1.4 | 1.0 |
| Other cash from financing | 34.5 | 9.9 | -54.2 | 23.3 | -5.3 | 12.8 | -4.5 |
| Cash from financing | -66.7 | 3.8 | -85.6 | 21.6 | -7.6 | 11.4 | -5.5 |
| |
| Free cash flow | -94.7 | -52.2 | -66.6 | -77.4 | -25.7 | -58.0 | -2.6 |
| Per share (diluted) | ($0.16) | ($0.09) | ($0.11) | ($0.13) | ($0.04) | ($0.10) | ($0.01) |
| |
| Cash paid for interest | -1.9 | -2.0 | -1.6 | -0.6 | -0.8 | -1.7 | -1.1 |