| In millions, except per share items | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | 112.2 | 79.7 | 87.8 | 79.5 | 81.2 | 46.1 | 90.4 | 52.4 |
| Depreciation and amortization | 87.7 | 84.8 | 85.1 | 84.2 | 80.8 | 81.7 | 81.2 | 83.4 |
| Stock-based compensation | | | | | 17.1 | | | |
| Change in working capital [+] | 15.6 | -3.9 | -5.8 | -4.7 | 5.5 | 0.3 | 1.6 | 7.1 |
| Accounts receivable | 15.6 | -3.9 | -5.8 | -4.7 | -6.8 | 0.3 | 1.6 | 7.1 |
| Other | | | | | 12.3 | | | |
| Other operating activities | -80.5 | 6.4 | -5.3 | -46.8 | -57.3 | 21.9 | -8.9 | -32.4 |
| Cash from operations | 135.1 | 167.0 | 161.9 | 112.3 | 127.4 | 150.0 | 164.3 | 110.5 |
| |
| Capital expenditures | 72.4 | 86.2 | 76.8 | 70.1 | -520.9 | 77.1 | 72.4 | 62.8 |
| Purchases of property and equipment | 72.4 | 86.2 | 76.8 | 70.1 | -520.9 | 77.1 | 72.4 | 62.8 |
| Purchases of short-term investments | 6.2 | 10.2 | 5.5 | 8.8 | -34.4 | 9.0 | 4.0 | 3.9 |
| Purchases of short-term investments | 6.2 | 10.2 | 5.5 | 8.8 | -34.4 | 9.0 | 4.0 | 3.9 |
| Other cash from investing | -30.1 | -154.3 | -323.9 | -253.9 | 380.4 | -141.2 | -143.3 | -100.9 |
| Cash from investing | 48.5 | -57.9 | -241.6 | -174.9 | -174.9 | -55.1 | -66.9 | -34.1 |
| |
| Cash dividends paid | -80.1 | -72.2 | -72.2 | -73.1 | -64.0 | -64.1 | -64.2 | -65.0 |
| Issuance of common stock, net | | 5.7 | 3.5 | 43.9 | 5.1 | | | |
| Financing costs | | | | | -33.7 | | | |
| Other cash from financing | -89.3 | -40.2 | 136.8 | -165.5 | -33.9 | -31.9 | -0.6 | -8.8 |
| Cash from financing | -169.4 | -106.6 | 68.2 | -194.7 | -59.1 | -96.0 | -64.7 | -73.8 |
| |
| Free cash flow | 207.4 | 253.2 | 238.7 | 182.4 | -393.6 | 227.1 | 236.8 | 173.4 |
| Per share (diluted) | $0.69 | $0.84 | $0.79 | $0.61 | ($1.32) | $0.76 | $0.79 | $0.58 |
| |
| Cash paid for interest | 50.3 | 48.9 | 45.1 | 48.5 | 45.7 | 49.8 | 41.1 | 54.4 |