| In millions, except per share items | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 0.0 | 0.0 | 0.0 | -35.3 | -28.6 | -1.4 | 8.3 | 9.3 |
| Depreciation and amortization [+] | 0.4 | 0.7 | 0.4 | 0.3 | 0.7 | 3.2 | 2.3 | 1.2 |
| Depreciation | 0.4 | 0.7 | 0.4 | 0.3 | 0.7 | 0.3 | 0.1 | 0.1 |
| Amortization of intangible assets | | | | | | 2.9 | 2.2 | 1.2 |
| Asset impairment charges | 18.5 | 56.1 | | | | | 0.4 | |
| Stock-based compensation | 2.5 | 2.7 | 5.9 | 4.7 | 2.0 | 2.7 | 1.3 | 0.5 |
| Deferred taxes | -0.2 | -0.2 | 6.7 | -11.8 | -22.5 | -1.8 | -2.3 | -3.1 |
| Change in working capital [+] | -3.5 | 22.3 | -4.2 | 10.5 | 21.8 | -5.5 | -1.8 | -2.5 |
| Accounts receivable | 5.4 | 11.0 | -17.1 | -18.5 | 12.2 | -3.9 | -5.8 | -8.4 |
| Inventories | 2.4 | 2.3 | 0.4 | 1.9 | 7.4 | -0.7 | -2.1 | -1.3 |
| Accounts payable | -2.1 | -8.0 | 6.7 | 12.2 | -3.4 | -1.8 | 0.7 | 1.6 |
| Accrued expenses | | | | | | 2.4 | 8.0 | 3.3 |
| Other | -9.2 | 17.0 | 5.7 | 14.9 | 5.7 | -1.5 | -2.5 | 2.2 |
| Other operating activities | -23.6 | -98.1 | -23.6 | 40.4 | 20.0 | 1.0 | 1.1 | |
| Cash from operations | -5.9 | -16.5 | -14.7 | 8.9 | -6.5 | -1.9 | 9.4 | 4.7 |
| |
| Capital expenditures [+] | 0.0 | -1.0 | -1.2 | -1.2 | -0.5 | -0.3 | -0.2 | -0.1 |
| Purchases of property and equipment | 0.0 | -1.0 | -1.2 | -1.2 | -0.5 | -0.3 | -0.2 | -0.1 |
| Sales of property and equipment | 2.0 | | | 0.0 | 0.0 | 0.0 | | |
| Purchases of intangible assets | | | | | | -0.9 | | 0.3 |
| Acquisitions | | -0.6 | -88.0 | -255.0 | -0.3 | -62.0 | | -1.5 |
| Sales of short-term investments | 0.0 | -1.0 | -1.2 | -1.2 | 4.1 | -0.3 | -0.2 | |
| Sales of short-term investments | | | | | 4.6 | | | |
| Other cash from investing | | | 4.9 | 6.2 | 19.6 | -1.7 | -2.0 | |
| Cash from investing | 2.0 | -1.6 | -84.3 | -249.9 | 23.4 | -64.9 | -2.2 | -5.7 |
| |
| Cash dividends paid | | | | | | | | -0.1 |
| Issuance of common stock, net | | | | | | 24.6 | 19.5 | -0.8 |
| Option exercises | 2.0 | 19.8 | 0.4 | 2.1 | 0.3 | 0.3 | 0.1 | |
| Financing costs | -13.6 | | -5.3 | -14.1 | | | | |
| Other cash from financing | -11.2 | 18.1 | 115.4 | 248.2 | -24.0 | 31.0 | -0.3 | |
| Cash from financing | 0.4 | -1.7 | 120.4 | 260.2 | -24.2 | 55.3 | 19.1 | 4.7 |
| |
| Free cash flow | -6.0 | -17.5 | -16.0 | 7.7 | -7.1 | -2.3 | 9.2 | 4.5 |
| Per share (diluted) | ($0.56) | ($2.23) | ($2.99) | $0.20 | ($0.19) | ($0.08) | $0.38 | |
| |
| Cash paid for interest | 28.5 | 30.2 | 30.2 | 6.5 | 2.7 | 0.2 | 0.2 | 0.0 |
| Cash paid for income taxes | -0.9 | -4.8 | -0.4 | 4.2 | 1.3 | 2.5 | 8.9 | 2.7 |