| 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 | 134.4 | 140.9 | 125.4 | 117.3 | 107.4 | 104.4 | 117.7 | 113.1 |
| Depreciation and amortization [+] | 15.9 | 14.2 | 12.3 | 10.6 | 6.0 | 6.1 | 6.4 | 6.6 |
| Amortization of intangible assets | 6.7 | 6.8 | 6.3 | 5.8 | 5.5 | 5.3 | 5.5 | 5.7 |
| Stock-based compensation | 4.1 | 4.1 | 3.9 | 3.4 | 3.2 | 2.9 | 2.6 | 2.5 |
| Deferred taxes | | | -8.0 | | | | -0.9 | |
| Change in working capital | -16.4 | 4.2 | 7.6 | -11.8 | 5.3 | -8.1 | 2.7 | 20.5 |
| Other | -16.4 | 4.2 | 7.6 | -11.8 | 5.3 | -8.1 | 2.7 | 20.5 |
| Other operating activities | 17.0 | 11.7 | 21.7 | 21.8 | 24.6 | 21.5 | 3.8 | 7.6 |
| Cash from operations | 147.0 | 167.0 | 162.9 | 140.3 | 145.5 | 125.9 | 132.2 | 136.1 |
| |
| Capital expenditures [+] | -4.6 | -4.2 | -3.6 | -4.2 | -4.6 | -3.6 | -3.2 | -2.6 |
| Purchases of property and equipment | -4.6 | -4.2 | -3.6 | -4.2 | -4.6 | -3.6 | -3.2 | -2.6 |
| Sales of property and equipment | | | 6.7 | | | 9.4 | | 2.7 |
| Purchases of short-term investments, net | 221.2 | -188.1 | -431.2 | -608.8 | -881.7 | -700.0 | -819.1 | -962.9 |
| Purchases of short-term investments | -78.8 | | | -929.1 | -1,224.7 | -1,065.1 | -1,190.7 | -1,280.2 |
| Sales of short-term investments | 300.0 | 263.6 | 267.8 | 320.3 | 343.1 | 365.1 | 371.6 | 317.3 |
| Other cash from investing | -377.3 | -537.6 | -295.1 | -173.1 | 94.0 | 392.9 | -64.3 | 33.5 |
| Cash from investing | -160.7 | -729.9 | -723.2 | -779.4 | -785.5 | -301.3 | -883.8 | -929.3 |
| |
| Cash dividends paid | -39.9 | -38.3 | -35.8 | -33.2 | -30.7 | -29.7 | -29.7 | -28.8 |
| Repurchase of common stock, net | -13.6 | -34.7 | -27.1 | -27.5 | -24.4 | | -4.3 | -5.4 |
| Option exercises | 1.1 | 1.3 | 1.2 | 1.2 | 0.4 | | 0.1 | 0.1 |
| Other cash from financing | -301.6 | -288.1 | -36.7 | 207.3 | 544.5 | 635.8 | 884.7 | 915.2 |
| Cash from financing | -356.3 | -362.5 | -100.9 | 145.4 | 489.1 | 601.6 | 850.5 | 880.8 |
| |
| Free cash flow | 142.3 | 162.8 | 159.3 | 136.1 | 141.0 | 122.2 | 129.0 | 133.6 |
| Per share (diluted) | $4.28 | $4.88 | $4.90 | $4.28 | $4.56 | $4.08 | $4.32 | $4.46 |
| |
| Cash paid for interest | 31.6 | 16.8 | 9.3 | 6.9 | 6.1 | 5.6 | 5.9 | 6.4 |
| Cash paid for income taxes | 64.3 | | 41.0 | 43.8 | 25.0 | | 46.3 | 42.0 |