| In millions, except per share items | Jun-30-23 | Mar-31-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | | | 46.1 | 63.8 | 65.8 | 90.7 | 94.9 | 95.1 |
| Depreciation and amortization [+] | | | 0.8 | | 1.0 | 1.0 | 1.0 | 1.0 |
| Depreciation | | | 0.8 | | 1.0 | 1.0 | 1.0 | 1.0 |
| Stock-based compensation | | | 1.9 | | 2.3 | 2.4 | 2.8 | 3.1 |
| Deferred taxes | | | -1.2 | | 1.3 | 3.6 | 3.1 | 2.6 |
| Change in working capital [+] | | | -2.4 | -7.7 | -7.9 | -5.0 | -17.2 | -6.2 |
| Income taxes | | | -2.5 | -6.9 | -6.8 | -2.1 | -9.9 | 0.8 |
| Other | | | 0.2 | -0.7 | -1.1 | -2.9 | -7.4 | -7.0 |
| Other operating activities | | | -8.2 | -30.9 | -24.5 | -50.8 | -37.5 | -30.9 |
| Cash from operations | | | 37.0 | 28.5 | 38.0 | 42.0 | 47.2 | 64.8 |
| |
| Capital expenditures [+] | | | -1.2 | -0.6 | -1.3 | -1.0 | -0.9 | -1.1 |
| Purchases of property and equipment | | | -1.2 | -0.6 | -1.3 | -1.0 | -0.9 | -1.1 |
| Sales of property and equipment | | | | | | | | 0.0 |
| Sales of short-term investments, net [+] | | | 277.7 | 242.8 | 123.9 | 147.3 | 63.0 | 59.1 |
| Purchases of short-term investments | | | -66.7 | -100.9 | -219.5 | -203.4 | -237.4 | -215.7 |
| Sales of short-term investments | | | 344.5 | 343.6 | 343.4 | 350.7 | 300.4 | 274.8 |
| Other cash from investing | | | -179.3 | -170.6 | -51.7 | -63.4 | -72.4 | -80.0 |
| Cash from investing | | | 97.2 | 71.5 | 71.0 | 82.9 | -10.3 | -22.0 |
| |
| Cash dividends paid | | | -88.7 | -88.3 | -99.9 | -89.8 | -89.6 | -89.2 |
| Repurchase of common stock, net | | | -3.6 | | | | | |
| Other cash from financing | | | -14.1 | -14.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Cash from financing | | | -106.4 | -102.4 | -100.0 | -89.9 | -89.6 | -89.2 |
| |
| Free cash flow | | | 35.8 | 27.9 | 36.7 | 41.0 | 46.3 | 63.7 |
| Per share (diluted) | | | $1.84 | $1.44 | $1.89 | $2.11 | $2.39 | $3.29 |
| |