| In millions, except per share items | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | 7.3 | 7.6 | 6.8 | 6.3 | 6.8 | 6.4 | 6.4 | 6.3 |
| Depreciation and amortization [+] | 0.6 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
| Depreciation | 0.5 | 0.4 | 0.4 | 0.4 | 0.3 | 0.4 | 0.4 | 0.4 |
| Amortization of intangible assets | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Stock-based compensation | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Deferred taxes | 0.0 | -0.3 | -0.2 | 0.2 | 0.4 | 0.4 | 0.0 | 0.2 |
| Change in working capital | -1.7 | 0.0 | 0.9 | 0.8 | -6.4 | 2.6 | 2.9 | 1.0 |
| Other | -1.7 | 0.0 | 0.9 | 0.8 | -6.4 | 2.6 | 2.9 | 1.0 |
| Other operating activities | 1.7 | 0.0 | 0.5 | 2.7 | 1.3 | 1.2 | -0.1 | 0.9 |
| Cash from operations | 8.1 | 8.1 | 8.8 | 10.7 | 2.8 | 11.4 | 10.0 | 9.2 |
| |
| Capital expenditures [+] | -0.2 | -0.2 | -0.9 | -0.3 | -0.4 | -0.1 | -1.5 | -0.7 |
| Purchases of property and equipment | -0.2 | -0.2 | -0.9 | -0.3 | -0.4 | -0.1 | -1.5 | -0.7 |
| Sales of property and equipment | | | | | | | 0.0 | |
| Purchases of short-term investments, net | 6.4 | 3.9 | 3.8 | -33.3 | -44.4 | -113.5 | -92.7 | -10.6 |
| Purchases of short-term investments | 0.0 | -11.4 | -11.3 | -46.4 | -62.0 | -123.5 | -106.6 | -35.6 |
| Sales of short-term investments | 6.4 | 15.2 | 15.2 | 13.1 | 17.5 | 10.0 | 14.0 | 25.0 |
| Other cash from investing | -19.7 | -86.3 | -12.4 | -40.0 | -16.0 | 32.5 | -0.2 | -8.5 |
| Cash from investing | -13.5 | -82.7 | -9.4 | -73.6 | -60.9 | -81.1 | -94.3 | -19.8 |
| |
| Cash dividends paid | -0.9 | -0.9 | -0.9 | -0.9 | -0.8 | -0.8 | -0.8 | -0.7 |
| Repurchase of common stock, net | | -0.5 | -1.5 | -1.6 | -0.3 | -2.5 | -4.0 | -0.2 |
| Other cash from financing | 8.4 | 41.2 | -21.9 | 38.9 | 51.7 | 81.5 | 40.2 | 122.3 |
| Cash from financing | 7.4 | 39.7 | -24.4 | 36.4 | 50.5 | 78.1 | 35.4 | 121.4 |
| |
| Free cash flow | 7.9 | 7.8 | 7.9 | 10.4 | 2.4 | 11.2 | 8.5 | 8.5 |
| Per share (diluted) | $1.40 | $1.39 | $1.39 | $1.83 | $0.41 | $1.96 | $1.45 | $1.44 |
| |
| Cash paid for interest | 7.6 | 2.0 | 1.5 | 0.6 | 1.2 | 0.8 | 1.3 | 1.1 |
| Cash paid for income taxes | | 2.7 | 3.5 | | 1.8 | 1.8 | 4.5 | |