| 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 | 23.8 | 22.8 | 22.0 | 19.1 | 31.1 | 31.0 | 32.9 | 36.2 |
| Depreciation and amortization [+] | 4.4 | 4.5 | 4.6 | 4.8 | 5.0 | 5.2 | 5.3 | 5.6 |
| Depreciation | 3.3 | 3.4 | 3.5 | 3.7 | 3.8 | 3.9 | 4.0 | 4.3 |
| Amortization | 1.0 | 1.1 | 1.1 | 1.1 | 1.2 | 1.2 | 1.3 | 1.3 |
| Stock-based compensation | 2.4 | 2.4 | 2.2 | 2.1 | 1.9 | 1.8 | 1.9 | 1.9 |
| Deferred taxes | -1.2 | -1.0 | -0.6 | -1.3 | 4.8 | 4.2 | 0.9 | -1.6 |
| Change in working capital | -10.5 | -8.5 | -1.8 | 14.0 | 2.0 | -2.5 | 1.9 | 1.5 |
| Other | -10.5 | -8.5 | -1.8 | 14.0 | 2.0 | -2.5 | 1.9 | 1.5 |
| Other operating activities | 13.7 | 14.7 | 9.7 | 9.6 | 1.4 | -8.9 | -2.1 | -0.2 |
| Cash from operations | 32.6 | 35.0 | 36.2 | 48.4 | 46.3 | 30.8 | 40.8 | 44.0 |
| |
| Capital expenditures | -1.9 | -0.9 | -0.9 | -1.2 | -1.2 | -1.3 | -1.3 | -1.3 |
| Purchases of property and equipment | -1.9 | -0.9 | -0.9 | -1.2 | -1.2 | -1.3 | -1.3 | -1.3 |
| Purchases of short-term investments, net | -5.5 | -16.2 | -100.1 | -123.6 | -111.9 | -147.1 | -6.9 | 39.9 |
| Purchases of short-term investments | | -96.2 | -181.5 | -177.7 | -239.7 | -260.7 | -195.0 | -156.9 |
| Sales of short-term investments | 64.1 | 80.0 | 81.4 | 54.1 | 127.7 | 113.6 | 188.1 | 196.8 |
| Other cash from investing | -238.7 | -233.5 | -170.0 | -141.5 | -62.8 | 76.1 | 6.2 | -367.8 |
| Cash from investing | -246.2 | -250.6 | -271.0 | -266.3 | -175.9 | -72.3 | -2.0 | -329.1 |
| |
| Cash dividends paid | -8.3 | -8.3 | -8.3 | -8.4 | -8.5 | -8.4 | -8.3 | -8.1 |
| Repurchase of common stock, net | -2.7 | -11.2 | -14.2 | | -15.9 | -6.0 | -1.9 | -1.1 |
| Option exercises | | 0.2 | | 0.2 | | 0.2 | | 0.1 |
| Other cash from financing | 189.2 | 119.4 | 109.5 | -3.1 | -70.7 | -55.9 | 54.9 | 518.4 |
| Cash from financing | 178.0 | 99.8 | 86.9 | -26.5 | -95.2 | -70.5 | 44.7 | 509.2 |
| |
| Free cash flow | 30.6 | 34.1 | 35.3 | 47.2 | 45.1 | 29.5 | 39.6 | 42.8 |
| Per share (diluted) | $2.92 | $3.22 | $3.30 | $4.37 | $4.10 | $2.66 | $3.56 | $3.86 |
| |
| Cash paid for interest | 24.3 | 15.1 | 8.7 | 5.7 | 5.3 | 5.9 | 6.8 | 8.3 |