| In millions, except per share items | Dec-31-13 | Dec-31-12 | Dec-31-11 | Dec-31-10 | Dec-31-09 | Dec-31-08 | Dec-31-07 | Dec-31-06 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K/A |
| OPERATING ACTIVITIES | | | | | | | | |
| Net income (loss) | -24.6 | -195.9 | 17.2 | 15.7 | 49.8 | 63.6 | | |
| |
| Adjustments to reconcile net income (loss) to net cash from (used in) operating activities: | | | | | | | | |
| Loss (gain) on disposal of discontinued operations | 1.9 | | | | | | | |
| Amortization of acquisition-related intangibles | 8.5 | 6.8 | 8.7 | | 7.6 | 8.4 | | |
| Provision for doubtful accounts | 1.7 | 2.0 | 1.3 | 2.7 | 0.2 | 0.4 | | |
| Depreciation and amortization | 22.2 | 20.3 | 22.2 | 23.4 | 19.4 | 16.0 | | |
| Impairment of goodwill | 21.2 | 175.2 | | | | | | |
| Debt issuance cost amortization | 1.7 | 2.0 | 2.0 | 0.3 | | | | |
| Amortization of investment premiums | 2.8 | | | | | | | |
| Loss (gain) on disposal of equipment | 0.1 | 0.1 | | | | | | |
| Gain on sale of investment | -17.5 | -3.2 | | | | | | |
| Loss on extinguishment of debt | | | | | 5.2 | | | |
| Stock-based compensation expense | 20.6 | 29.5 | 22.1 | 20.8 | 18.3 | 12.5 | | |
| Deferred and other income taxes | -0.2 | 23.3 | -2.6 | -2.8 | -0.2 | 5.0 | | |
| Change in operating assets and liabilities, net of acquisitions: | | | | | | | | |
| Accounts receivable | -15.3 | 2.7 | -15.3 | 0.2 | 2.7 | 11.3 | | |
| Prepaid and other assets | 9.7 | -8.4 | 2.6 | -6.5 | 23.3 | -26.5 | | |
| Accounts payable | -37.7 | -40.3 | 57.2 | -11.6 | 7.1 | 6.5 | | |
| Deferred revenue | -7.3 | 8.3 | -1.8 | -2.7 | 4.1 | 3.2 | | |
| Income tax payable | -1.7 | 10.9 | -4.1 | -1.5 | 1.4 | -5.4 | | |
| Other current liabilities | -1.5 | 5.9 | -24.3 | 12.3 | -1.1 | 4.5 | | |
| Net cash provided by (used in) operating activities | -15.3 | 38.8 | 94.8 | 57.8 | 137.1 | 95.2 | | |
| |
| INVESTING ACTIVITIES | | | | | | | | |
| Purchases of investments | -140.9 | -98.7 | -254.5 | -198.7 | | -480.9 | -436.8 | -193.6 |
| Sales of investments | 185.0 | 185.8 | 213.3 | 53.3 | 23.4 | 676.1 | 358.5 | 179.3 |
| Cash received (paid) for cost method investments | 39.6 | 2.7 | -9.5 | | | | | |
| Cash paid for acquisitions, net of cash received | -55.8 | | | -14.6 | -4.9 | -23.5 | | |
| Purchases of equipment and capitalized software | -23.3 | -22.0 | -23.9 | -18.6 | -31.9 | -26.9 | | |
| Net cash provided by (used in) investing activities | 4.7 | 68.3 | -74.6 | -180.7 | -62.2 | 144.8 | | |
| |
| FINANCING ACTIVITIES | | | | | | | | |
| Repurchase of senior convertible notes | -5.4 | -43.9 | | | | | | |
| Exercise of stock options | 3.5 | 4.1 | 2.8 | 5.0 | 10.1 | 7.2 | | |
| Sales of common stock under employee stock purchase plan | 2.2 | 2.6 | 2.5 | 2.4 | 2.5 | 2.7 | | |
| Repurchase of common stock | -51.2 | -22.7 | -79.8 | -35.0 | | -137.9 | | |
| Repurchase of restricted stock to satisfy tax withholding obligation | -4.5 | -5.1 | -6.0 | -3.3 | -0.7 | | | |
| Net cash provided by (used in) financing activities | -57.5 | -67.0 | -81.3 | 307.0 | -174.1 | -124.2 | | |
| EFFECT OF EXCHANGE RATE CHANGES ON CASH | 9.2 | 5.6 | -6.8 | -11.7 | 1.6 | -7.3 | | |
| NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | -59.0 | 45.7 | -67.9 | 172.4 | -97.6 | 108.5 | | |
| CASH AND CASH EQUIVALENTS, beginning of period | 542.9 | 497.2 | 565.1 | 392.7 | 490.3 | 381.8 | | |
| CASH AND CASH EQUIVALENTS, end of period | 483.9 | 542.9 | 497.2 | 565.1 | 392.7 | 490.3 | | |
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| SUPPLEMENTAL DISCLOSURES | | | | | | | | |
| Cash paid for interest on senior convertible notes | 6.1 | 7.1 | 7.0 | 0.1 | 1.3 | 2.4 | | |
| Cash paid for income taxes | 4.3 | 3.3 | 5.1 | 5.9 | 16.6 | 20.5 | | |