| | 2020-03-31 | 2021-12-31 | 2022-12-31 | 2023-12-31 | 2024-12-31 | 2025-06-30 | 2025-12-31 |
| Amortization Cash Flow | 43237000.0 | | -20995000.0 | -29130000.0 | -22701000.0 | -21922000.0 | -22290000.0 |
| Amortization Of Intangibles | 43237000.0 | | -20995000.0 | -29130000.0 | -22701000.0 | -21922000.0 | -22290000.0 |
| Asset Impairment Charge | | | 0.0 | 0.0 | 14304000.0 | 15566000.0 | 4606000.0 |
| Beginning Cash Position | | | 95027000.0 | 68776000.0 | 91354000.0 | 79923000.0 | 61884000.0 |
| Cash Dividends Paid | | | -428276000.0 | -456478000.0 | -504015000.0 | -512400000.0 | -525214000.0 |
| Cash Flow From Continuing Financing Activities | | | -475958000.0 | -355035000.0 | -493024000.0 | -163973000.0 | -347775000.0 |
| Cash Flow From Continuing Investing Activities | | | -206108000.0 | -341978000.0 | -326644000.0 | -585194000.0 | -421140000.0 |
| Cash Flow From Continuing Operating Activities | | | 655815000.0 | 719591000.0 | 790198000.0 | 824063000.0 | 827692000.0 |
| Change In Account Payable | | | -9088000.0 | 5152000.0 | 4253000.0 | 14493000.0 | -7868000.0 |
| Change In Other Current Assets | | | 1292000.0 | 3028000.0 | 1818000.0 | 488000.0 | -1962000.0 |
| Change In Other Current Liabilities | | | 7130000.0 | -316000.0 | 3086000.0 | 7652000.0 | 6560000.0 |
| Change In Other Working Capital | | | -10801000.0 | -11156000.0 | -11703000.0 | -14194000.0 | -18961000.0 |
| Change In Payable | | | -9088000.0 | 5152000.0 | 4253000.0 | 14493000.0 | -7868000.0 |
| Change In Payables And Accrued Expense | | | -9088000.0 | 5152000.0 | 4253000.0 | 14493000.0 | -7868000.0 |
| Change In Receivables | | | -35274000.0 | -13904000.0 | -24219000.0 | -22324000.0 | -18519000.0 |
| Change In Working Capital | | | -46741000.0 | -17196000.0 | -26765000.0 | -13885000.0 | -40750000.0 |
| Changes In Cash | | | -26251000.0 | 22578000.0 | -29470000.0 | 74896000.0 | 58777000.0 |
| Common Stock Dividend Paid | | | -428276000.0 | -453065000.0 | -490365000.0 | -498749000.0 | -511564000.0 |
| Common Stock Issuance | | | 61348000.0 | 103000.0 | 210000.0 | 462000.0 | 98669000.0 |
| Common Stock Payments | | | -81866000.0 | -36864000.0 | -219606000.0 | -19593000.0 | -8840000.0 |
| Depreciation | 366384000.0 | | 319697000.0 | 352282000.0 | 394714000.0 | 392470000.0 | 405044000.0 |
| Depreciation Amortization Depletion | | | 298702000.0 | 323152000.0 | 372013000.0 | 370548000.0 | 382754000.0 |
| Depreciation And Amortization | | | 298702000.0 | 323152000.0 | 372013000.0 | 370548000.0 | 382754000.0 |
| Dividend Received CFO | | | 61416000.0 | 66531000.0 | 69156000.0 | 71218000.0 | 64471000.0 |
| Dividends Received CFI | | | 1113000.0 | 1283000.0 | 453000.0 | 1271000.0 | 1389000.0 |
| Earnings Losses From Equity Investments | | | -59824000.0 | -50541000.0 | -50294000.0 | -54273000.0 | -133499000.0 |
| End Cash Position | | | 68776000.0 | 91354000.0 | 61884000.0 | 154819000.0 | 120661000.0 |
| Financing Cash Flow | | | -475958000.0 | -355035000.0 | -493024000.0 | -163973000.0 | -347775000.0 |
| Free Cash Flow | | | 655815000.0 | 719591000.0 | 790198000.0 | 824063000.0 | 827692000.0 |
| Gain Loss On Investment Securities | | | -101965000.0 | -6232000.0 | -40092000.0 | -14489000.0 | -28583000.0 |
| Income Tax Paid Supplemental Data | | 378000.0 | 570000.0 | 933000.0 | 7724000.0 | 1706000.0 | |
| Interest Paid Supplemental Data | | | 141359000.0 | 147176000.0 | 161356000.0 | 174122000.0 | 179216000.0 |
| Investing Cash Flow | | | -206108000.0 | -341978000.0 | -326644000.0 | -585194000.0 | -421140000.0 |
| Issuance Of Capital Stock | | | 61348000.0 | 103000.0 | 210000.0 | 462000.0 | 98669000.0 |
| Issuance Of Debt | | | 95000000.0 | 616500000.0 | 1457279000.0 | 1438508000.0 | 1057116000.0 |
| Long Term Debt Issuance | | | 95000000.0 | 616500000.0 | 1457279000.0 | 1438508000.0 | 1057116000.0 |
| Long Term Debt Payments | | | -112964000.0 | -477827000.0 | -1201889000.0 | -1061127000.0 | -936274000.0 |
| Net Business Purchase And Sale | | | -36266000.0 | -95508000.0 | -41345000.0 | -38980000.0 | -44323000.0 |
| Net Common Stock Issuance | | | -20518000.0 | -36761000.0 | -219396000.0 | -19131000.0 | 89829000.0 |
| Net Income From Continuing Operations | | | 488035000.0 | 370867000.0 | 409840000.0 | 412455000.0 | 540951000.0 |
| Net Investment Properties Purchase And Sale | | | -221924000.0 | -267074000.0 | -280158000.0 | -476125000.0 | -414273000.0 |
| Net Investment Purchase And Sale | | | 673000.0 | 8013000.0 | 5622000.0 | -85333000.0 | 3669000.0 |
| Net Issuance Payments Of Debt | | | -17964000.0 | 138673000.0 | 255390000.0 | 377381000.0 | 120842000.0 |
| Net Long Term Debt Issuance | | | -17964000.0 | 138673000.0 | 255390000.0 | 377381000.0 | 120842000.0 |
| Net Other Financing Charges | | | -9200000.0 | -469000.0 | -25003000.0 | -9823000.0 | -33232000.0 |
| Net Other Investing Changes | | | 50296000.0 | 11308000.0 | -11216000.0 | 13973000.0 | 32398000.0 |
| Net Short Term Debt Issuance | | -265000000.0 | 0.0 | 152000000.0 | | | |
| Operating Cash Flow | | | 655815000.0 | 719591000.0 | 790198000.0 | 824063000.0 | 827692000.0 |
| Operating Gains Losses | | | -167917000.0 | -52090000.0 | -84950000.0 | -66454000.0 | -158810000.0 |
| Other Non Cash Items | | | 5799000.0 | 8252000.0 | 13096000.0 | 13786000.0 | 15011000.0 |
| Pension And Employee Benefit Expense | | | -6128000.0 | 4782000.0 | 5256000.0 | 2308000.0 | 3272000.0 |
| Preferred Stock Dividend Paid | | | 0.0 | -3413000.0 | -13650000.0 | -13651000.0 | -13650000.0 |
| Proceeds From Stock Option Exercised | | -4083000.0 | | | | | |
| Purchase Of Business | | | -36266000.0 | -95508000.0 | -41345000.0 | -38980000.0 | -44323000.0 |
| Purchase Of Investment | | | -21112000.0 | -7990000.0 | -101044000.0 | -101751000.0 | -103312000.0 |
| Purchase Of Investment Properties | | | -365057000.0 | -278241000.0 | -388773000.0 | -489708000.0 | -539265000.0 |
| Repayment Of Debt | | | -112964000.0 | -477827000.0 | -1201889000.0 | -1061127000.0 | -936274000.0 |
| Repurchase Of Capital Stock | | | -81866000.0 | -36864000.0 | -219606000.0 | -19593000.0 | -8840000.0 |
| Sale Of Investment | | | 21785000.0 | 16003000.0 | 106666000.0 | 16418000.0 | 106981000.0 |
| Sale Of Investment Properties | | | 143133000.0 | 11167000.0 | 108615000.0 | 13583000.0 | 124992000.0 |
| Short Term Debt Issuance | | 0.0 | 95000000.0 | 557000000.0 | | | |
| Short Term Debt Payments | | -265000000.0 | -95000000.0 | -405000000.0 | | | |
| Stock Based Compensation | | | 16521000.0 | 20075000.0 | 23504000.0 | 20829000.0 | 19459000.0 |