| In millions, except per share items | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 | Dec-31-07 | Dec-31-06 | Dec-31-05 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -160.9 | -1.8 | -12.5 | 48.8 | -5.4 | -30.5 | -84.8 | -25.7 |
| Depreciation and amortization | 25.4 | 15.2 | 9.3 | 16.5 | 24.5 | 21.5 | 16.3 | 13.9 |
| Stock-based compensation | 3.3 | 2.6 | 2.8 | 3.5 | 3.1 | 3.9 | 3.9 | 2.3 |
| Change in working capital [+] | 62.6 | -2.6 | 12.4 | 69.9 | 6.8 | 7.1 | 2.2 | -1.2 |
| Accounts receivable | 2.1 | -6.7 | 1.6 | 2.3 | -1.9 | 7.4 | -6.4 | -5.0 |
| Income taxes | 55.9 | -0.1 | 13.2 | 75.9 | | | | |
| Other | 4.6 | 4.2 | -2.3 | -8.3 | 8.8 | | | |
| Other operating activities | 106.6 | -2.2 | -18.1 | -125.3 | 11.0 | 5.5 | 61.2 | 14.0 |
| Cash from operations | 37.1 | 11.3 | -6.1 | 13.5 | 40.0 | 7.4 | -1.3 | 3.4 |
| |
| Capital expenditures | 0.0 | 0.0 | 0.0 | 0.0 | -0.3 | -0.1 | -0.2 | -0.4 |
| Purchases of property and equipment | | | | | -0.3 | -0.1 | -0.2 | -0.4 |
| Purchases of short-term investments | | | -4.9 | -69.7 | | | | |
| Purchases of short-term investments | | | -4.9 | -69.7 | | | | |
| Other cash from investing | -148.2 | -63.8 | -38.7 | 195.9 | -137.9 | | | |
| Cash from investing | -148.2 | -63.8 | -43.6 | 126.2 | -138.3 | -3.5 | -66.9 | -77.8 |
| |
| Issuance of common stock, net | | | 52.5 | 13.8 | | | | |
| Financing costs | -0.5 | -0.3 | 0.0 | -2.5 | | | | |
| Other cash from financing | 109.0 | 55.5 | -17.4 | -140.3 | 18.5 | | | |
| Cash from financing | 109.4 | 55.8 | 35.2 | -124.0 | 18.5 | 41.1 | 47.8 | 119.8 |
| |
| Free cash flow | 37.1 | 11.3 | -6.1 | 13.5 | 39.7 | 7.4 | -1.5 | 3.0 |
| Per share (diluted) | $0.58 | $0.18 | ($0.12) | $0.29 | $0.96 | $0.18 | ($0.01) | $0.02 |