| In millions, except per share items | Jun-30-21 | Mar-31-21 | Dec-31-20 | Sep-30-20 | Jun-30-20 | Jun-05-20 | Mar-31-20 | Mar-05-20 |
| | 10-Q | 8-K | 10-K | 10-Q | 10-Q | 8-K | 10-Q | 8-K |
| Net income | -83.8 | -80.5 | -91.3 | -102.9 | -119.8 | | -129.9 | |
| Depreciation and amortization | | | 1.5 | 1.4 | 1.4 | | 1.3 | |
| Stock-based compensation | | | 8.3 | 8.0 | 7.7 | | 7.3 | |
| Change in working capital [+] | | | 15.5 | 21.4 | 27.8 | | 38.3 | |
| Accounts receivable | | | -2.2 | -11.9 | -3.2 | | -2.5 | |
| Inventories | | | -5.1 | -5.6 | -4.8 | | -2.2 | |
| Accounts payable | | | -2.5 | 3.0 | 2.6 | | 2.4 | |
| Accrued expenses | 5.7 | | -2.2 | -4.8 | -6.0 | | 1.8 | |
| Other | | | 27.5 | 40.7 | 39.2 | | 38.8 | |
| Other operating activities | | | -14.5 | -27.1 | -30.0 | | -29.1 | |
| Cash from operations | | | -80.6 | -99.3 | -112.9 | | -112.1 | |
| |
| Capital expenditures | | | -0.4 | -0.4 | -0.8 | | -0.9 | |
| Purchases of property and equipment | | | -0.4 | -0.4 | -0.8 | | -0.9 | |
| Purchases of short-term investments | | | -101.8 | | | | | |
| Purchases of short-term investments | | | -101.8 | | | | | |
| Other cash from investing | | | 74.7 | 59.2 | 117.7 | | 128.4 | |
| Cash from investing | | | -27.4 | -43.7 | 14.5 | | 25.0 | |
| |
| Issuance of common stock, net | | | | 67.6 | 64.6 | | 44.5 | |
| Option exercises | 0.9 | | 0.8 | 0.8 | 0.8 | | | |
| Financing costs | | | -5.6 | -5.6 | -6.9 | | | |
| Other cash from financing | | | 55.4 | 52.3 | 63.4 | | 18.2 | |
| Cash from financing | | | 126.1 | 124.7 | 134.2 | | 64.5 | |
| |
| Free cash flow | | | -80.9 | -99.7 | -113.6 | | -113.1 | |
| Per share (diluted) | | | ($2.03) | ($2.79) | ($3.67) | | ($4.01) | |
| |
| Cash paid for interest | 5.0 | | 4.6 | 4.6 | 4.9 | | 4.5 | |