| In millions, except per share items | Jun-30-23 | 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 | | 95.2 | 87.3 | 85.6 | 82.1 | 80.3 | 78.6 | 77.3 |
| Depreciation and amortization | | 38.0 | 36.3 | 34.8 | 33.2 | 31.9 | 30.6 | 29.4 |
| Stock-based compensation | | 4.2 | 4.1 | 3.9 | 4.0 | 4.0 | 3.9 | 3.4 |
| Deferred taxes | | -0.8 | | -0.9 | | | | |
| Change in working capital | | 30.9 | 22.2 | 13.0 | 12.3 | 10.7 | 7.6 | -14.4 |
| Other | | 30.9 | 22.2 | 13.0 | 12.3 | 10.7 | 7.6 | -14.4 |
| Other operating activities | | -38.9 | -23.6 | -14.1 | -11.5 | -13.3 | -14.6 | -4.3 |
| Cash from operations | | 128.7 | 125.4 | 122.4 | 120.1 | 113.7 | 106.2 | 91.5 |
| |
| Capital expenditures [+] | | -269.3 | -269.0 | -268.4 | -229.7 | -229.6 | -192.4 | -230.5 |
| Purchases of property and equipment | | | | -268.4 | | -229.6 | -192.4 | -230.5 |
| Sales of property and equipment | | 12.3 | | | | | 3.3 | |
| Other cash from investing | | -14.1 | -6.3 | 0.1 | -72.2 | -13.3 | -35.7 | 1.5 |
| Cash from investing | | -271.1 | -275.3 | -264.9 | -298.6 | -239.6 | -224.7 | -229.1 |
| |
| Cash dividends paid | | -102.0 | -99.5 | -96.9 | -94.6 | -91.8 | -89.1 | -86.3 |
| Issuance of common stock, net | | 116.2 | | 116.5 | 117.9 | | 152.1 | 151.7 |
| Financing costs | | -1.1 | -5.7 | -4.7 | -4.6 | -4.6 | -1.2 | |
| Other cash from financing | | 121.6 | 178.5 | 113.5 | 140.5 | 83.0 | -24.7 | 77.0 |
| Cash from financing | | 136.9 | 196.5 | 137.7 | 168.5 | 147.9 | 39.5 | 143.6 |
| |
| Free cash flow | | -140.6 | -143.6 | -146.0 | -109.6 | -116.0 | -86.2 | -139.1 |
| Per share (diluted) | | ($1.79) | ($1.85) | ($1.91) | ($1.46) | ($1.57) | ($1.19) | ($1.96) |
| |
| Cash paid for interest | | 24.4 | 22.2 | 22.7 | 21.7 | 21.9 | 21.7 | 23.2 |
| Cash paid for income taxes | | 0.5 | 0.3 | 0.3 | 0.4 | 0.5 | 0.6 | 0.6 |