| In millions, except per share items | Dec-31-20 | Sep-30-20 | Jun-30-20 | Mar-31-20 | Dec-31-19 | Sep-30-19 | Jun-30-19 | Mar-31-19 |
| | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | -6.9 | 31.2 | 27.8 | 20.5 | 16.1 | 33.5 | 34.6 | 32.8 |
| Depreciation and amortization [+] | 3.2 | 3.0 | 3.2 | 3.2 | 3.9 | 4.5 | 5.3 | 6.2 |
| Depreciation | 3.2 | 3.0 | 3.2 | 3.2 | 3.9 | 4.5 | 5.3 | 6.2 |
| Stock-based compensation | 23.2 | 11.1 | 12.5 | 10.0 | 11.1 | 11.6 | 11.2 | 12.7 |
| Deferred taxes | -3.2 | 2.0 | 8.6 | -12.1 | -7.6 | -2.5 | 1.2 | 5.9 |
| Change in working capital [+] | 4.1 | 22.5 | -26.6 | -15.3 | -22.1 | 20.4 | -15.9 | 64.2 |
| Accounts receivable | -6.6 | 19.6 | -22.6 | 6.8 | -16.2 | 0.7 | -7.6 | 77.0 |
| Other | 10.7 | 2.8 | -4.0 | -22.1 | -5.9 | 19.7 | -8.3 | -12.8 |
| Other operating activities | 75.6 | -6.5 | -26.1 | 23.1 | 80.3 | -6.5 | 4.3 | -139.3 |
| Cash from operations | 96.1 | 63.2 | -0.5 | 29.3 | 81.8 | 61.1 | 40.6 | -17.5 |
| |
| Capital expenditures [+] | -1.1 | -1.2 | -3.1 | -3.2 | -1.6 | -1.4 | -1.3 | -1.5 |
| Purchases of property and equipment | -1.1 | -1.2 | -3.1 | -3.2 | -1.6 | -1.4 | -1.3 | -1.5 |
| Sales of property and equipment | 0.0 | 2.3 | | | | | | |
| Sales of short-term investments | 77.0 | 23.4 | 39.1 | 33.9 | 45.1 | 37.5 | 40.3 | 38.4 |
| Sales of short-term investments | 77.0 | 23.4 | 39.1 | 33.9 | 45.1 | 37.5 | 40.3 | 38.4 |
| Other cash from investing | -43.4 | -6.4 | -15.6 | -3.0 | -32.2 | -50.3 | -29.1 | -50.8 |
| Cash from investing | 32.5 | 18.1 | 20.4 | 27.7 | 11.3 | -14.2 | 9.9 | -13.9 |
| |
| Cash dividends paid | -15.6 | -16.3 | -16.5 | -17.1 | -17.7 | -18.4 | -18.8 | -19.3 |
| Repurchase of common stock, net | -2.7 | -39.9 | -19.3 | -53.6 | -37.1 | -41.5 | -36.3 | -40.9 |
| Other cash from financing | | 0.6 | 3.7 | 1.3 | 2.0 | 1.3 | 1.5 | 0.7 |
| Cash from financing | -18.4 | -55.6 | -32.1 | -69.4 | -52.8 | -58.6 | -53.6 | -59.5 |
| |
| Free cash flow | 95.0 | 62.0 | -3.6 | 26.1 | 80.2 | 59.6 | 39.4 | -19.0 |
| Per share (diluted) | $1.46 | $0.97 | ($0.06) | $0.39 | $1.09 | $0.82 | $0.53 | ($0.25) |
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