| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | 24.9 | 35.8 | 36.3 | 37.3 | 31.4 | 20.4 | 28.2 | 27.4 |
| Depreciation and amortization [+] | 3.3 | 3.2 | 3.2 | 6.2 | 1.6 | 1.4 | 1.4 | 1.6 |
| Amortization of intangible assets | 1.7 | 1.7 | 1.7 | 1.7 | 1.7 | 1.2 | 1.2 | 1.4 |
| Stock-based compensation | 0.9 | 1.0 | 1.2 | 1.0 | 0.9 | 0.8 | 0.7 | 0.7 |
| Deferred taxes | | | -8.0 | | | | -0.9 | |
| Change in working capital | -20.1 | -6.7 | 19.8 | -9.4 | 0.4 | -3.2 | 0.3 | 7.8 |
| Other | -20.1 | -6.7 | 19.8 | -9.4 | 0.4 | -3.2 | 0.3 | 7.8 |
| Other operating activities | 8.3 | 5.6 | 2.4 | 0.8 | 3.0 | 15.5 | 2.5 | 3.6 |
| Cash from operations | 17.2 | 39.0 | 54.9 | 35.9 | 37.3 | 34.8 | 32.3 | 41.1 |
| |
| Capital expenditures [+] | -2.0 | -1.2 | -0.5 | -0.9 | -1.6 | -0.6 | -1.1 | -1.3 |
| Purchases of property and equipment | -2.0 | -1.2 | -0.5 | -0.9 | -1.6 | -0.6 | -1.1 | -1.3 |
| Sales of property and equipment | | | 0.0 | | | 6.7 | | 0.0 |
| Purchases of short-term investments, net | 68.1 | 81.1 | 55.3 | 16.7 | -341.1 | -162.1 | -122.3 | -256.2 |
| Purchases of short-term investments | -34.5 | | | -44.3 | -407.3 | -247.4 | -230.0 | -340.0 |
| Sales of short-term investments | 102.6 | 81.1 | 55.3 | 61.0 | 66.2 | 85.3 | 107.8 | 83.8 |
| Other cash from investing | -91.6 | 35.4 | -129.6 | -191.5 | -251.9 | 277.9 | -7.5 | 75.5 |
| Cash from investing | -25.5 | 115.3 | -74.7 | -175.8 | -594.6 | 121.9 | -130.9 | -181.9 |
| |
| Cash dividends paid | -10.0 | -10.0 | -10.0 | -10.0 | -8.4 | -7.4 | -7.4 | -7.4 |
| Repurchase of common stock, net | -1.5 | -7.6 | -0.3 | -4.3 | -22.6 | | -0.7 | -1.1 |
| Option exercises | 0.1 | 0.1 | 0.1 | 0.9 | 0.3 | | 0.1 | 0.1 |
| Other cash from financing | 28.2 | -133.5 | -109.1 | -87.3 | 41.7 | 117.9 | 134.9 | 249.9 |
| Cash from financing | 16.7 | -151.1 | -119.4 | -102.4 | 10.5 | 110.5 | 126.8 | 241.3 |
| |
| Free cash flow | 15.2 | 37.7 | 54.4 | 34.9 | 35.7 | 34.2 | 31.2 | 39.9 |
| Per share (diluted) | $0.46 | $1.13 | $1.66 | $1.04 | $1.06 | $1.13 | $1.04 | $1.34 |
| |
| Cash paid for interest | 16.5 | 9.1 | 3.8 | 2.2 | 1.8 | 1.5 | 1.4 | 1.4 |
| Cash paid for income taxes | 35.3 | | 5.0 | 24.0 | 12.0 | | 7.8 | 5.2 |