| 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 | S-1/A | S-1/A |
| Net income | -45.6 | 58.6 | 103.7 | -364.2 | 61.2 | 68.0 | 44.8 | 26.1 |
| Depreciation and amortization | 2.4 | 2.4 | 2.9 | 3.0 | 2.9 | 1.9 | 2.7 | |
| Stock-based compensation | 30.8 | 22.1 | 12.8 | 4.7 | | | | |
| Deferred taxes | 181.0 | 3.2 | 5.4 | 85.8 | -21.5 | -35.5 | -22.2 | -11.5 |
| Change in working capital [+] | 4.4 | 4.5 | 0.8 | 56.1 | -3.6 | 2.9 | 8.3 | 5.6 |
| Accounts receivable | 20.1 | 22.2 | 2.5 | -2.1 | | | | |
| Income taxes | -1.9 | -0.6 | -8.3 | 11.8 | | | | |
| Other | -13.8 | -17.0 | 6.5 | 46.4 | -3.6 | | 8.3 | 5.6 |
| Other operating activities | -149.5 | -30.0 | -20.9 | 266.3 | 61.1 | 74.9 | 11.8 | 7.1 |
| Cash from operations | 23.6 | 60.9 | 104.7 | 51.7 | 100.1 | 112.2 | 45.5 | 27.3 |
| |
| Capital expenditures | -0.3 | -1.7 | -1.4 | -0.8 | -3.5 | -2.0 | -2.8 | 0.0 |
| Purchases of property and equipment | -0.3 | -1.7 | -1.4 | -0.8 | -3.5 | -2.0 | -2.8 | |
| Sales of short-term investments, net [+] | 1.4 | -2.2 | -1.1 | 64.6 | | | -33.1 | -8.1 |
| Purchases of short-term investments | -4.4 | -7.1 | -5.5 | -2.5 | | | -33.1 | -8.1 |
| Sales of short-term investments | 5.8 | 4.9 | 4.4 | 67.1 | | | | |
| Other cash from investing | | | | | -26.4 | 22.0 | 23.9 | |
| Cash from investing | 1.0 | -3.9 | -2.5 | 63.8 | -29.9 | 20.0 | -11.9 | -8.1 |
| |
| Cash dividends paid | -7.1 | -14.0 | -12.4 | -234.8 | -117.0 | -60.0 | | -30.0 |
| Issuance of common stock, net | | -6.8 | -14.6 | 679.9 | | | | |
| Other cash from financing | -35.9 | -6.0 | -56.0 | -586.4 | | | | |
| Cash from financing | -43.0 | -26.7 | -83.0 | -141.3 | -117.0 | -60.0 | 0.0 | -30.0 |
| |
| Free cash flow | 23.2 | 59.2 | 103.3 | 50.9 | 96.6 | 110.2 | 42.7 | 27.3 |
| Per share (diluted) | $0.39 | $1.02 | $1.95 | $1.19 | $2.30 | $68,085.97 | $10,686.83 | $6,832.48 |
| |
| Cash paid for interest | 0.3 | 2.0 | 2.0 | | | | | |
| Cash paid for income taxes | 2.0 | 50.1 | 69.0 | 47.2 | | | | |