| | 2020-12-31 | 2021-12-31 | 2022-12-31 | 2023-12-31 | 2024-12-31 |
| Amortization Of Securities | -19075000.0 | 0.0 | 0.0 | | |
| Asset Impairment Charge | 1825000.0 | 0.0 | 0.0 | | |
| Beginning Cash Position | | 84041000.0 | 58638000.0 | 42681000.0 | 400334000.0 |
| Capital Expenditure | | -121195000.0 | -163193000.0 | -140371000.0 | -136395000.0 |
| Capital Expenditure Reported | | -121195000.0 | -163193000.0 | -140371000.0 | -136395000.0 |
| Cash Dividends Paid | | -542860000.0 | -565924000.0 | -586976000.0 | -620466000.0 |
| Cash Flow From Continuing Financing Activities | | -533265000.0 | -1137564000.0 | -477271000.0 | -419742000.0 |
| Cash Flow From Continuing Investing Activities | | -397397000.0 | 145958000.0 | -145140000.0 | -973051000.0 |
| Cash Flow From Continuing Operating Activities | | 905259000.0 | 975649000.0 | 980064000.0 | 1068305000.0 |
| Change In Account Payable | | 22298000.0 | -17266000.0 | 5335000.0 | 25194000.0 |
| Change In Other Current Liabilities | | 6143000.0 | 9627000.0 | 2735000.0 | -1910000.0 |
| Change In Other Working Capital | 749000.0 | | | | |
| Change In Payable | | 22298000.0 | -17266000.0 | 5335000.0 | 25194000.0 |
| Change In Payables And Accrued Expense | | 22298000.0 | -17266000.0 | 5335000.0 | 25194000.0 |
| Change In Prepaid Assets | | 4878000.0 | 5183000.0 | -9721000.0 | 32007000.0 |
| Change In Working Capital | | 33319000.0 | -2456000.0 | -1651000.0 | 55291000.0 |
| Changes In Cash | | -25403000.0 | -15957000.0 | 357653000.0 | -324488000.0 |
| Common Stock Dividend Paid | | -542860000.0 | -565924000.0 | -586976000.0 | -620466000.0 |
| Common Stock Payments | | -9627000.0 | -190040000.0 | -96004000.0 | -296000.0 |
| Depreciation Amortization Depletion | | 520066000.0 | 539319000.0 | 548438000.0 | 580220000.0 |
| Depreciation And Amortization | | 520066000.0 | 539319000.0 | 548438000.0 | 580220000.0 |
| Dividend Received CFO | | 104833000.0 | 95256000.0 | 76787000.0 | 62868000.0 |
| Dividends Received CFI | | 154120000.0 | 175624000.0 | 39751000.0 | 40503000.0 |
| Earnings Losses From Equity Investments | | -111721000.0 | -26030000.0 | -10561000.0 | -48206000.0 |
| End Cash Position | | 58638000.0 | 42681000.0 | 400334000.0 | 75846000.0 |
| Financing Cash Flow | | -533265000.0 | -1137564000.0 | -477271000.0 | -419742000.0 |
| Free Cash Flow | | 784064000.0 | 812456000.0 | 839693000.0 | 931910000.0 |
| Gain Loss On Investment Securities | | -179497000.0 | -48869000.0 | -69244000.0 | -183930000.0 |
| Gain Loss On Sale Of Business | | -2260000.0 | -17423000.0 | 0.0 | -210555000.0 |
| Interest Paid Supplemental Data | | 194203000.0 | 198323000.0 | 207038000.0 | 223220000.0 |
| Investing Cash Flow | | -397397000.0 | 145958000.0 | -145140000.0 | -973051000.0 |
| Issuance Of Debt | | 1796094000.0 | 1376452000.0 | 1442046000.0 | 2222351000.0 |
| Long Term Debt Issuance | | 745505000.0 | 1376452000.0 | 1442046000.0 | 2222351000.0 |
| Long Term Debt Payments | | -1053501000.0 | -1730178000.0 | -1198548000.0 | -1932639000.0 |
| Net Business Purchase And Sale | | -306266000.0 | -163188000.0 | -37405000.0 | -34073000.0 |
| Net Common Stock Issuance | | -9627000.0 | -190040000.0 | -96004000.0 | -296000.0 |
| Net Income From Continuing Operations | | 515691000.0 | 432985000.0 | 430708000.0 | 811306000.0 |
| Net Investment Properties Purchase And Sale | | 32518000.0 | 11684000.0 | -6159000.0 | -766600000.0 |
| Net Investment Purchase And Sale | | -7228000.0 | 53113000.0 | 43540000.0 | 26346000.0 |
| Net Issuance Payments Of Debt | | 33261000.0 | -353726000.0 | 243498000.0 | 289712000.0 |
| Net Long Term Debt Issuance | | -307996000.0 | -353726000.0 | 243498000.0 | 289712000.0 |
| Net Other Financing Charges | | -72536000.0 | -47399000.0 | -37789000.0 | -101005000.0 |
| Net Other Investing Changes | | -149346000.0 | 231918000.0 | -44496000.0 | -102832000.0 |
| Net Short Term Debt Issuance | -55000000.0 | 341257000.0 | -289184000.0 | -52073000.0 | |
| Operating Cash Flow | | 905259000.0 | 975649000.0 | 980064000.0 | 1068305000.0 |
| Operating Gains Losses | | -274468000.0 | -92320000.0 | -79805000.0 | -442691000.0 |
| Other Cash Adjustment Outside Changein Cash | 81094000.0 | | | | |
| Other Non Cash Items | | -1631000.0 | -4722000.0 | -2514000.0 | -5668000.0 |
| Proceeds From Stock Option Exercised | | 58497000.0 | 19525000.0 | 0.0 | 12313000.0 |
| Provisionand Write Offof Assets | | 141000.0 | 381000.0 | 70000.0 | -179000.0 |
| Purchase Of Business | | -306266000.0 | -163188000.0 | -37405000.0 | -34073000.0 |
| Purchase Of Investment | | -23805000.0 | -18109000.0 | -20780000.0 | -1002000.0 |
| Purchase Of Investment Properties | | -264936000.0 | -146301000.0 | -105547000.0 | -1013886000.0 |
| Repayment Of Debt | | -1762833000.0 | -1730178000.0 | -1198548000.0 | -1932639000.0 |
| Repurchase Of Capital Stock | | -9627000.0 | -190040000.0 | -96004000.0 | -296000.0 |
| Sale Of Investment | | 16577000.0 | 71222000.0 | 64320000.0 | 27348000.0 |
| Sale Of Investment Properties | | 297454000.0 | 157985000.0 | 99388000.0 | 247286000.0 |
| Short Term Debt Issuance | 1038426000.0 | 1050589000.0 | 1376452000.0 | 844046000.0 | |
| Short Term Debt Payments | -1093426000.0 | -709332000.0 | -1665636000.0 | -896119000.0 | |
| Stock Based Compensation | | 7308000.0 | 7206000.0 | 8031000.0 | 7158000.0 |
| Unrealized Gain Loss On Investment Securities | -12515000.0 | -33104000.0 | 57983000.0 | | |
