| In millions, except per share items | Jun-30-23 | Dec-05-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Dec-05-21 | Sep-30-21 |
| | 10-Q | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 8-K | 10-Q |
| Net income | | | 11.9 | 11.1 | 10.7 | 10.8 | | 11.2 |
| Depreciation and amortization [+] | | | | | | 0.9 | | 0.8 |
| Depreciation | | | | | | 0.9 | | 0.8 |
| Amortization | | | | | | 0.0 | | 0.0 |
| Change in working capital | | | -4.5 | -5.1 | -1.3 | -1.2 | | -4.1 |
| Other | | | -4.5 | -5.1 | -1.3 | -1.2 | | -4.1 |
| Other operating activities | | | 6.6 | 7.4 | 2.4 | 4.5 | | 5.7 |
| Cash from operations | | | 14.8 | 14.2 | 12.6 | 15.0 | | 13.6 |
| |
| Capital expenditures | | | 3.7 | 3.2 | 2.5 | 2.0 | | -1.9 |
| Purchases of property and equipment | | | 3.7 | 3.2 | 2.5 | 2.0 | | -1.8 |
| Purchases of short-term investments, net | | | 148.7 | 155.8 | 99.9 | 102.9 | | -70.2 |
| Purchases of short-term investments | | | 106.4 | 112.1 | 50.7 | 46.3 | | -129.1 |
| Sales of short-term investments | | | 42.3 | 43.7 | 49.2 | 56.6 | | 58.9 |
| Other cash from investing | | | -394.1 | -378.3 | -283.7 | -162.8 | | 29.6 |
| Cash from investing | | | -241.7 | -219.3 | -181.3 | -58.0 | | -42.5 |
| |
| Cash dividends paid | | | 5.8 | 5.8 | | 3.3 | | -3.2 |
| Repurchase of common stock, net | | | -0.7 | | | -0.9 | | -0.6 |
| Other cash from financing | | | 45.7 | -9.2 | 17.7 | 102.6 | | 118.2 |
| Cash from financing | | | 50.8 | -3.9 | 20.1 | 105.0 | | 114.3 |
| |
| Free cash flow | | | 18.4 | 17.4 | 15.1 | 17.0 | | 11.9 |
| Per share (diluted) | | | $6.78 | $6.39 | $5.50 | $6.21 | | $4.27 |
| |
| Cash paid for interest | | | 1.8 | 1.7 | 1.8 | 2.0 | | 2.3 |
| Cash paid for income taxes | | | 2.5 | 2.1 | | 2.4 | | 2.2 |