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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Net operating loss carryforwards | $ 3,103.9 | $ 3,071.8
Property and equipment | 1,397.4 | 1,555.4
Interest limitation carryforwards | 112.9 | 126.0
Employee benefits, including share-based compensation | 28.0 | 36.6
Foreign tax credits | 0.2 | 16.4
Other | 17.9 | 21.9
Valuation allowance | (3,292.3) | (3,971.3)
Total deferred tax assets | 1,368.0 | 856.8
Deferred tax liabilities | 26.9 | 26.7
Deferred Tax Assets, Net | 1,341.1 | $ 830.1
Net operating loss carryforwards | $ 13,600.0 |

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