| 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 | -6.9 | 13.8 | 58.7 | 17.7 | 0.0 | 0.0 | 0.0 | 203.5 |
| Depreciation and amortization | 13.7 | 17.2 | 23.2 | 30.9 | 29.7 | 33.9 | 28.0 | 31.2 |
| Stock-based compensation | 8.7 | 7.8 | 18.2 | 12.5 | 1.9 | 5.3 | 20.3 | 1.0 |
| Deferred taxes | 1.8 | -2.2 | 1.7 | 3.3 | -45.7 | 11.7 | 61.1 | 19.5 |
| Change in working capital [+] | -16.9 | -2.3 | -10.0 | -19.4 | 27.8 | -19.6 | -0.2 | 23.5 |
| Accounts receivable | | | | | 27.6 | -27.3 | | 6.6 |
| Income taxes | -6.9 | 3.9 | 14.4 | -7.7 | | | | |
| Other | -10.0 | -6.2 | -24.4 | -11.7 | | | | |
| Other operating activities | -41.2 | -12.0 | -125.2 | -59.4 | -233.3 | 47.3 | -62.4 | -93.3 |
| Cash from operations | -40.8 | 22.3 | -33.4 | -14.3 | -219.6 | 78.8 | 46.8 | 185.4 |
| |
| Capital expenditures | -5.2 | -7.2 | -9.5 | -10.1 | -17.2 | -33.2 | -14.5 | -11.4 |
| Purchases of property and equipment | -5.2 | -7.2 | -9.5 | -10.1 | -17.2 | -33.2 | -14.5 | -11.4 |
| Acquisitions | -6.1 | | | | | | | |
| Sales of short-term investments, net [+] | 68.9 | 257.6 | 184.0 | 113.7 | | | | |
| Purchases of short-term investments | -17.6 | -8.6 | -38.1 | -70.4 | | | | |
| Sales of short-term investments | 86.5 | 266.2 | 222.1 | 184.1 | | | | |
| Other cash from investing | 361.3 | -251.0 | -3.3 | -153.3 | | | | |
| Cash from investing | 419.0 | -0.5 | 171.2 | -49.6 | 364.4 | 323.0 | 159.2 | -106.2 |
| |
| Cash dividends paid | | | -118.5 | | | -317.0 | | -34.7 |
| Repurchase of common stock, net | -5.6 | -6.3 | -2.7 | -13.1 | -58.1 | -41.1 | -1,617.9 | -13.4 |
| Other cash from financing | -374.1 | -11.0 | -21.1 | | | | | |
| Cash from financing | -379.8 | -17.3 | -142.3 | -18.7 | -58.9 | -420.2 | -173.3 | -79.2 |
| |
| Free cash flow | -46.0 | 15.2 | -42.9 | -24.3 | -236.7 | 45.6 | 32.4 | 173.9 |
| Per share (diluted) | ($1.51) | $0.49 | ($1.40) | ($0.81) | | | | $3.69 |
| |
| Cash paid for interest | 12.9 | 18.5 | 27.6 | 31.4 | | | | |
| Cash paid for income taxes | 5.9 | 8.8 | 21.5 | 21.0 | | | | |