| In millions, except per share items | Jun-30-15 | Mar-31-15 | Dec-31-14 | Sep-30-14 | Jun-30-14 | Mar-31-14 | Dec-31-13 | Sep-30-13 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -112.7 | -95.0 | -135.6 | -125.4 | -114.5 | -107.2 | -51.9 | -55.9 |
| Depreciation and amortization [+] | 0.6 | 0.4 | 0.3 | 0.2 | 0.1 | 0.1 | 0.2 | 0.4 |
| Depreciation | 0.3 | 0.4 | 0.3 | 0.2 | 0.1 | 0.3 | 0.4 | 0.5 |
| Stock-based compensation | 17.6 | 14.0 | 12.4 | 10.9 | 9.7 | 8.5 | 6.5 | 5.2 |
| Change in working capital [+] | 52.0 | 50.3 | 48.7 | 40.5 | 34.6 | 37.2 | 37.7 | 28.1 |
| Restricted cash | | | | 14.7 | 11.1 | 14.8 | 13.1 | 9.8 |
| Inventories | -4.0 | | | | | | | |
| Other current assets | -1.1 | 0.7 | -1.2 | -2.0 | -1.6 | -2.0 | -0.4 | 0.8 |
| Other | 52.0 | 43.3 | 39.8 | 27.8 | 25.1 | 24.3 | 24.9 | 17.5 |
| Other operating activities | -34.9 | -36.1 | 14.7 | 19.4 | 20.2 | 16.9 | -37.3 | -27.6 |
| Cash from operations | -77.3 | -66.4 | -59.5 | -54.4 | -49.8 | -44.5 | -44.9 | -49.8 |
| |
| Capital expenditures | -1.9 | -2.3 | -2.1 | -1.9 | -0.8 | -0.1 | 0.0 | -0.1 |
| Purchases of property and equipment | -1.9 | -2.3 | -2.1 | -1.9 | -0.8 | -0.1 | | |
| Purchases of short-term investments, net | -43.1 | 11.1 | -16.2 | -50.2 | -20.1 | -27.0 | -56.5 | |
| Purchases of short-term investments | -112.0 | | -63.5 | -87.4 | -54.2 | -41.1 | -63.8 | |
| Sales of short-term investments | 68.9 | 65.0 | 47.3 | 37.2 | 34.1 | 14.0 | 7.4 | |
| Other cash from investing | -0.5 | | | | | | | |
| Cash from investing | -45.4 | 8.9 | -18.3 | -52.1 | -20.9 | -27.1 | -56.5 | -29.5 |
| |
| Issuance of common stock, net | 0.0 | 135.0 | | | | | 125.0 | |
| Option exercises | 1.3 | 1.1 | | 1.3 | 0.5 | 2.3 | | |
| Other cash from financing | 132.7 | -3.7 | -3.2 | -2.7 | -2.7 | 0.4 | 9.8 | |
| Cash from financing | 131.4 | 130.2 | -4.5 | 121.0 | 121.7 | 123.2 | 133.6 | 89.4 |
| |
| Free cash flow | -79.2 | -68.7 | -61.6 | -56.3 | -50.6 | -44.6 | -44.9 | -49.9 |
| Per share (diluted) | ($3.36) | ($3.02) | ($2.75) | ($2.61) | ($2.46) | ($2.28) | ($2.41) | ($3.31) |
| |
| Cash paid for interest | 2.3 | | 1.2 | 1.3 | 1.1 | | 1.6 | |