| In millions, except per share items | Mar-31-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net income | | 118.5 | 129.6 | 132.9 | 73.6 | 68.8 | 55.2 | 41.9 |
| Depreciation and amortization | | 32.7 | 33.4 | 34.6 | 36.5 | 34.8 | 34.9 | 35.1 |
| Stock-based compensation | | 0.5 | | | | 0.5 | | |
| Change in working capital [+] | | 16.9 | 8.2 | 23.2 | 21.4 | 42.0 | 17.1 | 16.3 |
| Accounts receivable | | 3.2 | 1.1 | 1.7 | 0.2 | -2.9 | -6.1 | -6.1 |
| Other | | 13.8 | 7.1 | 21.4 | 21.2 | 44.9 | 23.2 | 22.4 |
| Other operating activities | | -19.3 | -74.9 | -72.7 | -18.5 | -58.2 | -0.9 | -15.9 |
| Cash from operations | | 149.3 | 96.7 | 118.5 | 113.5 | 87.8 | 107.0 | 78.1 |
| |
| Capital expenditures | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Purchases of short-term investments, net | | -191.5 | | 9.5 | | | 3.6 | |
| Purchases of short-term investments | | -197.4 | | | | | | |
| Sales of short-term investments | | | | 9.5 | | | 3.6 | |
| Other cash from investing | | 62.9 | 68.6 | 66.0 | -14.3 | -20.2 | -29.3 | -32.5 |
| Cash from investing | | -128.6 | 74.5 | 75.5 | -10.7 | -16.6 | -25.7 | -32.5 |
| |
| Cash dividends paid | | -92.2 | -92.2 | -92.2 | -92.2 | -92.2 | -92.2 | -92.2 |
| Financing costs | | 0.0 | | -0.1 | | -7.2 | -7.2 | -7.2 |
| Other cash from financing | | -68.1 | | -68.1 | | 29.6 | 29.6 | 175.2 |
| Cash from financing | | -160.3 | -160.3 | -160.3 | -2.8 | -55.4 | -55.4 | 90.3 |
| |
| Free cash flow | | 149.3 | 96.7 | 118.5 | 113.5 | 87.8 | 107.0 | 78.1 |
| Per share (diluted) | | $29.13 | $18.87 | $23.12 | $22.15 | $17.15 | $20.89 | $15.25 |
| |
| Cash paid for interest | | 17.7 | 17.7 | 18.6 | 18.7 | 18.4 | 19.2 | 22.5 |