| In millions, except per share items | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K |
| Net income | -24.4 | -123.0 | -98.4 | -90.5 |
| Depreciation and amortization [+] | 133.8 | 139.5 | 127.0 | 104.0 |
| Depreciation | 53.0 | 50.3 | 49.9 | 44.1 |
| Amortization | 80.8 | 89.2 | 77.1 | 59.9 |
| Stock-based compensation | 5.3 | 4.1 | 5.3 | 5.3 |
| Deferred taxes | -0.1 | -23.3 | -69.1 | -14.6 |
| Change in working capital [+] | -2.0 | -1.3 | 2.7 | -6.1 |
| Accounts receivable | -7.8 | -6.3 | -1.5 | 4.6 |
| Other current assets | 1.7 | 1.6 | 4.2 | 3.7 |
| Accounts payable | 0.7 | -3.8 | -0.8 | -1.6 |
| Deferred revenues | 1.8 | 4.9 | -7.4 | -5.3 |
| Other | 1.5 | 2.5 | 8.2 | -7.5 |
| Other operating activities | 14.6 | 72.8 | 49.9 | 24.4 |
| Cash from operations | 127.1 | 68.8 | 17.4 | 22.4 |
| |
| Capital expenditures [+] | -34.4 | -25.7 | -19.1 | -16.6 |
| Purchases of property and equipment | -14.6 | -10.7 | -7.4 | -5.2 |
| Capitalized product costs | -19.8 | -15.0 | -11.7 | -11.3 |
| Acquisitions | -66.5 | -78.5 | -804.2 | -4.5 |
| Other cash from investing | 0.0 | 24.2 | 3.9 | 10.4 |
| Cash from investing | -100.9 | -80.0 | -819.4 | -10.7 |
| |
| Financing costs | -0.9 | | | |
| Other cash from financing | -67.9 | 121.9 | 808.4 | -8.6 |
| Cash from financing | -67.0 | 121.9 | 808.4 | -8.6 |
| |
| Free cash flow | 112.5 | 58.1 | 10.0 | 17.2 |
| Per share (diluted) | $0.72 | $0.57 | ($0.06) | $0.21 |
| |
| Cash paid for interest | 69.8 | 102.4 | 94.6 | 48.1 |
| Cash paid for income taxes | 17.5 | 10.3 | 5.6 | 4.7 |