| In millions, except per share items | Mar-31-19 | Dec-31-18 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Dec-31-17 | Sep-30-17 | Jun-30-17 |
| | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | -2.0 | 30.5 | 5.7 | 6.6 | 1.0 | 6.1 | 5.0 | 3.7 |
| Depreciation and amortization [+] | 2.7 | 2.3 | 2.4 | 2.3 | 2.4 | 2.3 | 2.3 | 2.2 |
| Depreciation | 1.1 | 1.1 | 1.0 | 0.9 | 1.0 | 1.0 | 0.9 | 0.8 |
| Amortization of intangible assets | 1.6 | 1.2 | 1.4 | 1.4 | 1.4 | 1.3 | 1.3 | 1.3 |
| Stock-based compensation | 3.5 | 3.4 | 3.4 | 3.3 | 3.3 | 2.9 | 3.0 | 2.9 |
| Change in working capital [+] | -10.6 | 0.5 | -2.6 | -0.8 | -6.6 | -1.3 | -4.4 | -2.4 |
| Accounts receivable | 2.1 | 0.9 | -5.0 | -3.6 | 3.2 | -0.2 | -3.7 | -3.4 |
| Inventories | -1.7 | -1.3 | -0.1 | -2.9 | -2.0 | -4.0 | -2.0 | -2.4 |
| Other current assets | -3.0 | -1.1 | 0.4 | -0.2 | -0.9 | -1.0 | -0.8 | 0.9 |
| Accounts payable | -3.9 | 0.1 | 1.3 | 4.5 | -3.9 | 2.9 | 2.6 | 1.0 |
| Accrued expenses | -3.4 | 1.2 | 0.9 | 1.0 | -3.1 | 1.2 | 0.0 | 1.0 |
| Deferred revenues | | | -0.4 | 0.3 | | 0.2 | -0.4 | 0.3 |
| Other | -0.7 | 0.8 | 0.3 | 0.2 | 0.1 | -0.3 | -0.1 | 0.2 |
| Other operating activities | 1.6 | -23.7 | 1.0 | 0.1 | 0.4 | 2.0 | 0.6 | -0.1 |
| Cash from operations | -4.7 | 13.0 | 9.9 | 11.6 | 0.5 | 12.0 | 6.6 | 6.3 |
| |
| Capital expenditures | -1.2 | -2.4 | -2.1 | -1.0 | -0.9 | -0.9 | -1.4 | -0.7 |
| Purchases of property and equipment | -1.2 | -2.4 | -2.1 | -1.0 | -0.9 | -0.9 | -1.4 | -0.7 |
| Acquisitions | -11.7 | | -1.1 | -0.3 | | -1.4 | | 0.0 |
| Purchases of short-term investments, net | 1.0 | 3.0 | 0.4 | 0.7 | -0.3 | -13.1 | -8.2 | -7.6 |
| Purchases of short-term investments | -27.2 | -11.1 | -19.2 | -12.9 | -19.5 | -24.3 | -23.5 | -14.3 |
| Sales of short-term investments | 28.2 | 14.1 | 19.6 | 13.6 | 19.2 | 11.2 | 15.3 | 6.7 |
| Cash from investing | -11.8 | 0.7 | -2.7 | -0.6 | -1.2 | -15.4 | -9.6 | -8.3 |
| |
| Repurchase of common stock, net | -2.5 | -7.9 | -4.9 | -3.6 | -7.4 | | | |
| Option exercises | 0.3 | 0.2 | 7.6 | 1.1 | 2.1 | 5.7 | 3.5 | 4.2 |
| Financing costs | | | | | -0.1 | | | |
| Other cash from financing | -1.2 | -0.5 | 13.4 | 1.1 | 0.3 | 10.4 | 5.0 | 8.0 |
| Cash from financing | -4.1 | -8.7 | 0.9 | -3.5 | -9.1 | 4.7 | 1.5 | 3.7 |
| |
| Free cash flow | -5.9 | 10.6 | 7.9 | 10.6 | -0.4 | 11.1 | 5.2 | 5.6 |
| Per share (diluted) | ($0.22) | $0.39 | $0.28 | $0.39 | ($0.02) | $0.41 | $0.19 | $0.21 |
| |
| Cash paid for interest | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Cash paid for income taxes | 0.2 | 0.2 | 0.3 | 0.5 | 0.2 | | 0.3 | 0.8 |