| 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 | | | -6.0 | -2.1 | -0.1 | -0.2 | -0.9 | 0.2 |
| Depreciation and amortization [+] | | | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Amortization of intangible assets | | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Stock-based compensation | | | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 |
| Deferred taxes | | | | | | | | -0.2 |
| Change in working capital | | | 13.5 | 2.4 | 0.2 | -0.2 | -3.9 | -3.5 |
| Other | | | 13.5 | 2.4 | 0.2 | -0.2 | -3.9 | -3.5 |
| Other operating activities | | | -6.5 | 2.3 | 0.9 | 0.6 | 4.6 | 3.1 |
| Cash from operations | | | 1.7 | 3.4 | 3.5 | 2.7 | 0.5 | 0.3 |
| |
| Capital expenditures [+] | | | -0.7 | -0.5 | -0.5 | -0.3 | -0.3 | -0.2 |
| Purchases of property and equipment | | | -0.7 | -0.5 | -0.5 | -0.3 | -0.3 | -0.2 |
| Sales of property and equipment | | | 0.8 | 0.8 | | | 0.4 | 0.4 |
| Acquisitions | | | | | | | -10.5 | |
| Sales of short-term investments, net [+] | | | 25.5 | 26.5 | 4.6 | -18.5 | -13.9 | -9.2 |
| Purchases of short-term investments | | | | -1.2 | -24.4 | | | -58.6 |
| Sales of short-term investments | | | 26.7 | 27.7 | 29.0 | 32.1 | 36.7 | 49.4 |
| Other cash from investing | | | -51.2 | -60.7 | -42.7 | -24.4 | -10.6 | 4.4 |
| Cash from investing | | | -25.7 | -33.4 | -37.7 | -42.3 | -34.8 | -15.6 |
| |
| Other cash from financing | | | 18.0 | 21.8 | -0.8 | -5.0 | -3.8 | 4.3 |
| Cash from financing | | | 18.0 | 21.8 | -0.8 | -5.0 | -3.8 | 4.3 |
| |
| Free cash flow | | | 1.0 | 2.9 | 3.0 | 2.4 | 0.3 | 0.1 |
| Per share (diluted) | | | $0.30 | $0.91 | $0.93 | $0.75 | $0.09 | $0.04 |
| |
| Cash paid for interest | | | -4.4 | -4.2 | -4.1 | -4.3 | -4.0 | -3.6 |
| Cash paid for income taxes | | | 0.0 | 0.1 | | | -1.5 | -1.5 |