| | 2021-12-31 | 2022-12-31 | 2023-12-31 | 2024-12-31 | 2025-06-30 | 2025-12-31 |
| Amortization Cash Flow | | 4000000.0 | 3900000.0 | 3900000.0 | | 8800000.0 |
| Amortization Of Intangibles | | 4000000.0 | 3900000.0 | 3900000.0 | | 8800000.0 |
| Amortization Of Securities | | -1000000.0 | -500000.0 | -100000.0 | -4900000.0 | -13000000.0 |
| Beginning Cash Position | | 1812700000.0 | 2409100000.0 | 2422800000.0 | 2614700000.0 | 4042800000.0 |
| Capital Expenditure | | -136800000.0 | -196800000.0 | -197300000.0 | -203400000.0 | -275400000.0 |
| Cash Dividends Paid | | 0.0 | -64800000.0 | -84800000.0 | -85300000.0 | -84800000.0 |
| Cash Flow From Continuing Financing Activities | | 254600000.0 | -274600000.0 | 1108300000.0 | -860700000.0 | 1022000000.0 |
| Cash Flow From Continuing Investing Activities | | -23300000.0 | -196700000.0 | -22200000.0 | -659100000.0 | -611200000.0 |
| Cash Flow From Continuing Operating Activities | | 365100000.0 | 485000000.0 | 533900000.0 | 558300000.0 | 678900000.0 |
| Change In Account Payable | | 11700000.0 | -5200000.0 | 9100000.0 | 5500000.0 | -16200000.0 |
| Change In Accrued Expense | | 7400000.0 | 35400000.0 | 22800000.0 | 8300000.0 | 800000.0 |
| Change In Inventory | | -200000.0 | 200000.0 | 0.0 | -600000.0 | -300000.0 |
| Change In Other Current Assets | | -4000000.0 | -9600000.0 | -2700000.0 | -2500000.0 | -6500000.0 |
| Change In Other Working Capital | | -95400000.0 | -126400000.0 | -98700000.0 | -117700000.0 | -152200000.0 |
| Change In Payable | | 11700000.0 | -5200000.0 | 9100000.0 | 5409000.0 | -16200000.0 |
| Change In Payables And Accrued Expense | | 19100000.0 | 30200000.0 | 31900000.0 | 13800000.0 | -15400000.0 |
| Change In Prepaid Assets | | -6500000.0 | -6600000.0 | -6700000.0 | -9900000.0 | 1700000.0 |
| Change In Receivables | | -13400000.0 | 6400000.0 | -22800000.0 | -19900000.0 | -5700000.0 |
| Change In Working Capital | | -100400000.0 | -105800000.0 | -99000000.0 | -136800000.0 | -178400000.0 |
| Changes In Account Receivables | | -13400000.0 | 6400000.0 | -22800000.0 | -19900000.0 | -5700000.0 |
| Changes In Cash | | 596400000.0 | 13700000.0 | 1620000000.0 | -961600000.0 | 1089700000.0 |
| Common Stock Dividend Paid | | 0.0 | -64800000.0 | -84800000.0 | -85300000.0 | -84800000.0 |
| Common Stock Payments | | -94700000.0 | -286600000.0 | -122800000.0 | -42000000.0 | -325500000.0 |
| Deferred Income Tax | | -3200000.0 | 2600000.0 | 5800000.0 | 14300000.0 | 154400000.0 |
| Deferred Tax | | -3200000.0 | 2600000.0 | 5800000.0 | 14300000.0 | 154400000.0 |
| Depreciation | | 88700000.0 | 110000000.0 | 142000000.0 | | 167500000.0 |
| Depreciation Amortization Depletion | | 92700000.0 | 113900000.0 | 145900000.0 | 159800000.0 | 176300000.0 |
| Depreciation And Amortization | | 92700000.0 | 113900000.0 | 145900000.0 | 159800000.0 | 176300000.0 |
| End Cash Position | | 2409100000.0 | 2422800000.0 | 4042800000.0 | 1653100000.0 | 5132500000.0 |
| Financing Cash Flow | | 254600000.0 | -274600000.0 | 1108300000.0 | -860800000.0 | 1022000000.0 |
| Free Cash Flow | | 228300000.0 | 288200000.0 | 336600000.0 | 354800000.0 | 403500000.0 |
| Gain Loss On Investment Securities | -662000.0 | -1600000.0 | | | | |
| Gain Loss On Sale Of PPE | | -200000.0 | 0.0 | 0.0 | | -100000.0 |
| Income Tax Paid Supplemental Data | | 100600000.0 | 138800000.0 | 134800000.0 | | 78100000.0 |
| Interest Paid Supplemental Data | | 500000.0 | 1000000.0 | 2000000.0 | | 2100000.0 |
| Investing Cash Flow | | -23300000.0 | -196700000.0 | -22200000.0 | -659100000.0 | -611200000.0 |
| Issuance Of Debt | 0.0 | 29000000.0 | 0.0 | 0.0 | | |
| Long Term Debt Issuance | 0.0 | 29000000.0 | 0.0 | 0.0 | | |
| Long Term Debt Payments | | -29300000.0 | -29000000.0 | 0.0 | | 0.0 |
| Net Common Stock Issuance | | -94700000.0 | -286600000.0 | -122800000.0 | -42000000.0 | -325500000.0 |
| Net Income From Continuing Operations | | 281400000.0 | 340800000.0 | 502000000.0 | 415700000.0 | 453400000.0 |
| Net Intangibles Purchase And Sale | | -4100000.0 | -4200000.0 | -4400000.0 | | -4500000.0 |
| Net Investment Purchase And Sale | | 113500000.0 | 0.0 | 175100000.0 | | -335900000.0 |
| Net Issuance Payments Of Debt | | -300000.0 | -29000000.0 | 0.0 | | 0.0 |
| Net Long Term Debt Issuance | | -300000.0 | -29000000.0 | 0.0 | | 0.0 |
| Net Other Financing Charges | | 349600000.0 | 105800000.0 | 1315900000.0 | -733500000.0 | 1426800000.0 |
| Net Other Investing Changes | -131478000.0 | 113512000.0 | | | | -335900000.0 |
| Net PPEPurchase And Sale | | -132700000.0 | -192500000.0 | -192900000.0 | -199000000.0 | -270800000.0 |
| Operating Cash Flow | | 365100000.0 | 485000000.0 | 533900000.0 | 558200000.0 | 678900000.0 |
| Operating Gains Losses | -516000.0 | -1800000.0 | 1200000.0 | | | -100000.0 |
| Other Non Cash Items | | 2500000.0 | 3000000.0 | 2200000.0 | 2700000.0 | -32400000.0 |
| Proceeds From Stock Option Exercised | | | 0.0 | 0.0 | | 5500000.0 |
| Purchase Of Intangibles | | -4100000.0 | -4200000.0 | -4400000.0 | | -4500000.0 |
| Purchase Of Investment | | -268700000.0 | -25000000.0 | -24900000.0 | | -835900000.0 |
| Purchase Of PPE | | -132700000.0 | -192600000.0 | -192900000.0 | -199000000.0 | -270900000.0 |
| Repayment Of Debt | | -29300000.0 | -29000000.0 | 0.0 | | 0.0 |
| Repurchase Of Capital Stock | | -94700000.0 | -286600000.0 | -122800000.0 | -42000000.0 | -325500000.0 |
| Sale Of Investment | | 382200000.0 | 25000000.0 | 200000000.0 | | 500000000.0 |
| Sale Of PPE | | 0.0 | 100000.0 | 0.0 | | 100000.0 |
| Stock Based Compensation | | 94900000.0 | 129800000.0 | -22900000.0 | 107400000.0 | 118700000.0 |
