| In millions, except per share items | Dec-31-18 | Sep-30-18 | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 | Mar-31-17 | Dec-31-16 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -0.1 | 0.7 | -4.9 | -1.9 | 0.4 | 0.4 | -1.0 | 0.1 |
| Depreciation and amortization [+] | 0.1 | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Amortization of intangible assets | 0.0 | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | 0.1 | 0.3 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Deferred taxes | | | | | | | | 1.7 |
| Change in working capital | 0.1 | | 10.9 | 1.8 | 0.4 | 0.3 | -0.1 | -0.4 |
| Other | 0.1 | | 10.9 | 1.8 | 0.4 | 0.3 | -0.1 | -0.4 |
| Other operating activities | 0.7 | 0.2 | -7.2 | 0.2 | 0.2 | 0.3 | 1.7 | -1.2 |
| Cash from operations | 0.9 | 1.2 | -1.0 | 0.3 | 1.2 | 1.2 | 0.8 | 0.4 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | -0.3 | -0.1 | -0.2 | -0.1 | -0.1 | -0.1 |
| Purchases of property and equipment | | | -0.3 | -0.1 | -0.2 | -0.1 | -0.1 | -0.1 |
| Sales of property and equipment | | | 0.0 | 0.8 | | | 0.0 | 0.4 |
| Acquisitions | | | | | | | 0.5 | |
| Sales of short-term investments, net [+] | 4.3 | | 2.9 | 11.1 | 7.4 | 4.1 | 3.8 | -10.8 |
| Purchases of short-term investments | | | | 0.0 | -1.2 | | | -23.1 |
| Sales of short-term investments | 4.3 | | 2.9 | 11.1 | 8.6 | 4.1 | 3.8 | 12.3 |
| Other cash from investing | 6.6 | | 0.1 | -21.2 | -15.4 | -14.7 | -9.3 | -3.3 |
| Cash from investing | 10.8 | 0.0 | 2.7 | -9.5 | -8.2 | -10.7 | -5.1 | -13.8 |
| |
| Option exercises | 0.0 | | | | | | | |
| Other cash from financing | -7.2 | | 11.6 | 8.6 | -2.6 | 0.4 | 15.4 | -14.0 |
| Cash from financing | -7.2 | 0.0 | 11.6 | 8.6 | -2.6 | 0.4 | 15.4 | -14.0 |
| |
| Free cash flow | 0.9 | 1.2 | -1.3 | 0.2 | 0.9 | 1.1 | 0.7 | 0.3 |
| Per share (diluted) | $0.27 | $0.38 | ($0.40) | $0.07 | $0.29 | $0.34 | $0.21 | $0.09 |
| |
| Cash paid for interest | -1.4 | | -1.2 | -1.2 | -0.9 | -1.1 | -1.0 | -1.1 |
| Cash paid for income taxes | | | 0.0 | 0.0 | | | 0.0 | -1.5 |