| 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 | 8-K | 10-Q | 10-Q | 10-Q | 8-K | 10-Q |
| Net income | 28.5 | 32.0 | 31.2 | 25.5 | 20.5 | 17.0 | 15.4 | 16.5 |
| Depreciation and amortization [+] | | | | | | | | 2.6 |
| Depreciation | 3.2 | 3.1 | 3.2 | 3.1 | 2.8 | 2.5 | 2.0 | 2.1 |
| Amortization | | | | | | | | 0.5 |
| Stock-based compensation | | | | | | | | 0.4 |
| Deferred taxes | | | | | | | | -0.9 |
| Change in working capital | | | | | | | | 4.3 |
| Other | | | | | | | | 4.3 |
| Other operating activities | | | | | | | | 1.5 |
| Cash from operations | | | | | | | | 24.4 |
| |
| Capital expenditures | | | | | | | | -3.7 |
| Purchases of property and equipment | | | | | | | | -3.7 |
| Sales of short-term investments, net [+] | 48.7 | 52.2 | | 57.3 | 44.5 | 36.1 | | 31.1 |
| Purchases of short-term investments | 0.0 | 0.0 | | 0.0 | 0.0 | 0.0 | | -13.0 |
| Sales of short-term investments | 48.7 | 52.2 | | 57.3 | 44.5 | 36.1 | | 44.0 |
| Other cash from investing | | | | | | | | -311.4 |
| Cash from investing | | | | | | | | -284.1 |
| |
| Cash dividends paid | | | | | | | | -5.7 |
| Other cash from financing | | | | | | | | 426.5 |
| Cash from financing | | | | | | | | 414.0 |
| |
| Free cash flow | | | | | | | | 20.7 |
| Per share (diluted) | | | | | | | | $1.74 |
| |
| Cash paid for interest | 25.4 | 18.1 | | 7.7 | 5.7 | 7.0 | | 6.1 |