| 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 | 1.9 | 4.1 | 5.4 | 3.4 | 3.3 | 3.7 | 4.1 | 3.4 |
| Depreciation and amortization | 0.4 | 0.4 | 0.5 | 0.4 | 0.4 | 0.4 | 0.5 | 0.4 |
| Stock-based compensation | | | 0.0 | 0.0 | | | 0.0 | 0.0 |
| Deferred taxes | 0.2 | -0.3 | 0.6 | -0.4 | 0.4 | -0.1 | 0.0 | -0.4 |
| Change in working capital [+] | 1.7 | -1.8 | -1.0 | 0.1 | 0.4 | -1.8 | 1.1 | -0.2 |
| Income taxes | | | -0.1 | 0.0 | | | 0.0 | 0.0 |
| Other | 1.7 | -1.8 | -0.9 | 0.1 | 0.4 | -1.8 | 1.0 | -0.2 |
| Other operating activities | -0.9 | 1.7 | -1.6 | 1.4 | 1.0 | 0.2 | 5.8 | 4.9 |
| Cash from operations | 3.3 | 4.1 | 4.0 | 4.9 | 5.6 | 2.4 | 11.4 | 8.2 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Sales of property and equipment | 0.3 | 0.1 | -0.1 | -0.1 | 0.3 | 0.1 | -0.1 | -0.1 |
| Purchases of short-term investments, net | 18.6 | 19.3 | 19.1 | 17.9 | 23.3 | 55.2 | -33.4 | -119.5 |
| Purchases of short-term investments | 6.9 | | | | 1.7 | 33.3 | -60.5 | -148.5 |
| Sales of short-term investments | 11.7 | 19.3 | 19.1 | 17.9 | 21.6 | 21.9 | 27.0 | 29.0 |
| Other cash from investing | -26.4 | 30.8 | -33.4 | -45.6 | -41.4 | -66.9 | -2.4 | -4.1 |
| Cash from investing | -7.5 | 50.2 | -14.4 | -27.8 | -17.8 | -11.6 | -35.9 | -123.7 |
| |
| Cash dividends paid | 1.2 | 1.2 | -1.1 | -1.1 | 1.1 | 1.1 | -1.1 | -1.1 |
| Issuance of common stock, net | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | -0.2 | -0.3 |
| Other cash from financing | 23.5 | -57.2 | 10.1 | 24.0 | 14.8 | 7.9 | 15.0 | 84.5 |
| Cash from financing | 24.8 | -56.0 | 9.1 | 22.9 | 16.1 | 9.1 | 13.7 | 83.1 |
| |
| Free cash flow | 3.3 | 4.1 | 4.0 | 4.9 | 5.6 | 2.4 | 11.4 | 8.2 |
| Per share (diluted) | $0.92 | $1.14 | $1.11 | $1.38 | $1.57 | $0.66 | $3.22 | $2.30 |
| |
| Cash paid for interest | -1.0 | 4.6 | 3.2 | 2.2 | 1.2 | 1.1 | 1.1 | 1.2 |
| Cash paid for income taxes | 1.1 | 1.1 | 1.1 | 1.1 | 1.0 | 1.1 | 1.1 | 1.0 |