| 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 | | 328.3 | 294.7 | 297.3 | 270.2 | 213.3 | 195.1 | 113.8 |
| Depreciation and amortization | | 334.9 | 331.9 | 328.0 | 327.2 | 330.6 | 336.4 | 336.0 |
| Stock-based compensation | | | | | 17.1 | | | |
| Change in working capital [+] | | -8.8 | -4.7 | 2.7 | 14.5 | 16.7 | 55.8 | 36.1 |
| Accounts receivable | | -21.1 | -17.0 | -9.6 | 2.2 | 15.1 | 41.6 | -1.3 |
| Other | | | | | 12.3 | | | |
| Other operating activities | | -103.0 | -87.5 | -91.1 | -76.7 | -27.2 | -44.7 | -31.0 |
| Cash from operations | | 568.5 | 551.5 | 554.0 | 552.2 | 544.3 | 538.4 | 458.5 |
| |
| Capital expenditures | | -287.8 | -296.9 | -301.3 | -308.6 | -290.3 | 8.6 | -135.2 |
| Purchases of property and equipment | | -287.8 | -296.9 | -301.3 | -308.6 | -290.3 | 8.6 | -135.2 |
| Purchases of short-term investments | | -9.8 | -11.1 | -12.5 | -17.5 | -25.6 | -12.1 | -19.4 |
| Purchases of short-term investments | | -9.8 | -11.1 | -12.5 | -17.5 | -25.6 | -3.9 | -15.3 |
| Other cash from investing | | -351.7 | -338.6 | -158.0 | -5.0 | 132.8 | -148.7 | -0.2 |
| Cash from investing | | -649.4 | -646.5 | -471.8 | -331.0 | -183.1 | -152.3 | -154.8 |
| |
| Cash dividends paid | | -281.5 | -273.4 | -265.4 | -257.2 | -193.2 | -129.1 | -149.8 |
| Issuance of common stock, net | | 58.2 | 52.6 | 49.0 | 5.1 | | | |
| Financing costs | | | | | -33.7 | | | |
| Other cash from financing | | -102.8 | -94.5 | -231.8 | -75.2 | -409.7 | -192.3 | -402.8 |
| Cash from financing | | -292.3 | -281.6 | -414.5 | -293.6 | -568.1 | -300.7 | -518.2 |
| |
| Free cash flow | | 280.7 | 254.6 | 252.7 | 243.7 | 254.0 | 547.0 | 323.3 |
| Per share (diluted) | | $0.94 | $0.85 | $0.85 | $0.82 | $0.85 | $1.84 | $1.09 |
| |
| Cash paid for interest | | 188.2 | 189.1 | 185.2 | 191.0 | 193.5 | 184.1 | 190.6 |