| In millions, except per share items | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -29.1 | -2.8 | -4.1 | 4.1 | 34.7 | 1.4 | 0.3 | -23.6 |
| Depreciation and amortization | 3.2 | 4.2 | 1.7 | 1.1 | 1.6 | 2.0 | 2.9 | 4.0 |
| Stock-based compensation | 1.0 | 1.3 | 1.6 | 1.5 | 1.5 | 1.4 | 1.2 | 1.0 |
| Tax benefit from stock-based compensation | | | | | | | | 0.0 |
| Deferred taxes | 20.4 | 5.0 | 3.1 | 3.1 | -30.4 | 0.0 | 0.1 | 21.1 |
| Change in working capital [+] | 14.7 | 1.5 | 2.7 | -3.5 | -37.5 | 1.6 | -0.6 | 19.7 |
| Accounts receivable | 3.3 | 2.0 | 1.5 | -4.8 | -1.5 | 5.0 | -3.6 | -1.4 |
| Other current assets | -0.9 | -0.5 | -0.3 | -0.1 | 0.5 | -0.7 | 0.3 | 0.6 |
| Accounts payable | 0.1 | 0.0 | 0.1 | -0.4 | 0.1 | -1.3 | 1.3 | |
| Accrued expenses | -1.5 | -3.7 | -1.7 | 1.9 | -0.4 | -0.2 | 1.7 | |
| Deferred revenues | | | | | | | | -0.3 |
| Other | 13.5 | 3.7 | 3.0 | | -36.2 | -1.3 | -0.3 | 20.8 |
| Other operating activities | -13.1 | -3.5 | -1.8 | -0.6 | 34.9 | 2.4 | 2.0 | -21.6 |
| Cash from operations | -3.0 | 5.7 | 3.3 | 5.8 | 4.7 | 8.8 | 5.8 | 0.7 |
| |
| Capital expenditures [+] | -0.2 | -0.4 | -0.3 | -0.3 | -0.6 | -0.6 | -0.8 | -0.5 |
| Purchases of property and equipment | -0.2 | -0.4 | -0.3 | -0.2 | -0.3 | -0.4 | -0.5 | -0.4 |
| Capitalized product costs | | | | 0.0 | -0.3 | -0.2 | -0.3 | -0.1 |
| Purchases of intangible assets | | | | | -0.2 | | | |
| Acquisitions | | | | | | | -2.7 | -3.0 |
| Sales of short-term investments | | | | | | | | 6.9 |
| Sales of short-term investments | | | | | | | | 6.9 |
| Other cash from investing | | -0.1 | -24.1 | | | | | 0.7 |
| Cash from investing | -0.2 | -0.5 | -24.5 | -0.3 | -0.8 | -0.6 | -3.5 | 4.1 |
| |
| Repurchase of common stock, net | -1.3 | | -0.3 | -1.0 | -1.5 | -2.6 | -3.2 | |
| Option exercises | 5.2 | 4.0 | 1.5 | 1.9 | 1.3 | 0.8 | 0.5 | 0.4 |
| Other cash from financing | 5.2 | 6.4 | 8.3 | 3.8 | 2.5 | 1.5 | 0.8 | 0.7 |
| Cash from financing | -1.3 | 2.5 | 6.5 | 1.0 | -0.3 | -1.9 | -2.9 | 0.2 |
| |
| Free cash flow | -3.1 | 5.3 | 2.9 | 5.5 | 4.4 | 8.5 | 5.3 | 0.3 |
| Per share (diluted) | ($0.23) | $0.44 | $0.25 | $0.42 | $0.34 | $0.71 | $0.42 | $0.02 |
| |
| Cash paid for interest | 0.1 | 0.1 | 0.0 | 0.0 | | | 0.0 | 0.0 |