| In millions, except per share items | Dec-31-13 | Sep-30-13 | Jun-30-13 | Mar-31-13 | Dec-31-12 | Sep-30-12 | Jun-30-12 | Mar-31-12 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | | | | | | | | 9.9 |
| Depreciation and amortization [+] | 6.1 | 6.3 | 6.5 | | 9.5 | 9.7 | 10.2 | 10.3 |
| Depreciation | 5.3 | 5.4 | 5.6 | | 7.9 | 8.0 | 8.3 | 8.4 |
| Amortization of intangible assets | 0.8 | 0.9 | 1.0 | | 1.6 | 1.8 | 1.9 | 1.9 |
| Stock-based compensation | 2.6 | 2.7 | 2.9 | | 4.0 | 3.9 | 3.9 | 3.8 |
| Deferred taxes | -0.2 | 0.6 | 0.1 | | 1.6 | 1.2 | 1.4 | 0.8 |
| Change in working capital [+] | 4.6 | -1.4 | -2.5 | | -8.5 | -7.9 | -5.7 | -7.6 |
| Accounts receivable | -0.8 | 0.1 | -4.1 | | -4.8 | -7.2 | 1.4 | -0.3 |
| Inventories | 0.5 | 0.1 | 1.0 | | -1.2 | -0.5 | -2.7 | -1.9 |
| Other current assets | | | | | | | | -0.3 |
| Accounts payable | 3.5 | -1.2 | -1.5 | | -2.5 | -0.5 | -0.9 | -3.1 |
| Accrued expenses | | | | | | | | -1.8 |
| Other | | | | | | | | -0.1 |
| Other operating activities | | | | | | | | 1.3 |
| Cash from operations | 27.6 | 24.6 | 23.1 | 22.7 | 19.7 | 17.4 | 20.6 | 18.6 |
| |
| Capital expenditures | -5.3 | -4.8 | -3.6 | -4.3 | -5.6 | -7.1 | -7.8 | -7.2 |
| Purchases of property and equipment | -5.3 | -4.8 | -3.6 | | -5.6 | -7.1 | -7.8 | -7.2 |
| Acquisitions | | -0.4 | | | | | | |
| Sales of short-term investments | | | | | | | | -1,358,993.2 |
| Sales of short-term investments | | | | | | | | 6.8 |
| Other cash from investing | | | | | | | | -9.7 |
| Cash from investing | 5.8 | 7.1 | 12.3 | 9.7 | 7.8 | -2.2 | -8.6 | -10.2 |
| |
| Repurchase of common stock, net | -2.8 | -12.7 | | | -38.2 | -31.3 | -24.7 | -11.2 |
| Option exercises | | | | | | | | 4.4 |
| Other cash from financing | | | | | | | | -20.5 |
| Cash from financing | 1.9 | -10.5 | -8.8 | -27.0 | -28.1 | -39.7 | -49.6 | -36.1 |
| |
| Free cash flow | 22.3 | 19.8 | 19.5 | 18.4 | 14.1 | 10.2 | 12.8 | 11.3 |
| Per share (diluted) | | | | | | | | $0.77 |
| |
| Cash paid for interest | | | | | | | | 0.3 |
| Cash paid for income taxes | | | | | | | | 2.8 |