| 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 | 29.6 | 29.6 | 29.6 | 23.2 | 23.2 | 23.2 | 23.2 | 4.7 |
| Depreciation and amortization | 1.3 | 1.4 | 1.4 | 1.3 | 1.2 | 1.1 | 1.0 | 1.1 |
| Stock-based compensation | 1.5 | 1.6 | 1.4 | 1.1 | 1.4 | 0.8 | 0.9 | 1.0 |
| Deferred taxes | -1.3 | -0.2 | -1.4 | 0.1 | 0.6 | -0.9 | 0.2 | -0.2 |
| Other operating activities | 3.8 | 8.7 | 8.7 | 11.2 | 11.2 | 8.7 | 4.7 | 23.1 |
| Cash from operations | 34.9 | 41.1 | 39.7 | 36.9 | 37.6 | 32.9 | 30.0 | 29.7 |
| |
| Capital expenditures [+] | -2.3 | -0.4 | -0.3 | -0.6 | -0.7 | -0.5 | -0.6 | -0.3 |
| Purchases of property and equipment | -2.3 | -0.4 | -0.3 | -0.6 | -0.7 | -0.5 | -0.6 | -0.3 |
| Sales of property and equipment | | | | 3.4 | 3.1 | 3.0 | 0.0 | 0.0 |
| Purchases of short-term investments, net | 31.9 | 40.9 | -69.9 | -75.3 | -93.4 | -106.0 | | |
| Purchases of short-term investments | | | | | -133.1 | -131.1 | | |
| Sales of short-term investments | 31.9 | 42.9 | 63.1 | 57.7 | 39.7 | 25.0 | | |
| Other cash from investing | -148.5 | -242.5 | -275.9 | -194.2 | -101.0 | -71.7 | -42.9 | -33.2 |
| Cash from investing | -118.7 | -201.6 | -342.8 | -266.8 | -191.9 | -175.3 | -43.5 | -33.4 |
| |
| Cash dividends paid | -5.1 | -4.7 | -4.4 | -4.3 | -4.2 | -4.1 | -4.0 | -3.9 |
| Repurchase of common stock, net | -0.1 | -0.1 | | | 0.0 | -0.1 | | |
| Option exercises | 0.2 | | | | | | | |
| Other cash from financing | 162.3 | 208.3 | 211.7 | 175.6 | 94.3 | 110.8 | 68.5 | 152.7 |
| Cash from financing | 156.8 | 203.5 | 207.3 | 171.4 | 90.1 | 106.6 | 64.5 | 148.8 |
| |
| Free cash flow | 32.6 | 40.7 | 39.4 | 36.3 | 36.9 | 32.3 | 29.4 | 29.5 |
| Per share (diluted) | $3.54 | $4.41 | $4.29 | $3.96 | $4.04 | $3.55 | $3.23 | $3.22 |
| |
| Cash paid for interest | 23.6 | 15.4 | 9.1 | 5.0 | 3.1 | 3.0 | 3.2 | 3.7 |
| Cash paid for income taxes | 15.1 | 10.0 | 10.0 | 8.3 | 7.5 | | 7.5 | 8.3 |