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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Net operating loss carryforwards | $ 3,308.9 | $ 3,028.7
Property and equipment | 1,535.1 | 1,454.8
Interest limitation carryforwards | 123.4 | 193.4
Employee benefits, including share-based compensation | 41.6 | 43.1
Foreign tax credits | 44.7 | 60.7
Premiums on long-term debt | 6.0 | 8.1
Other | 14.4 | 20.1
Valuation allowance | (4,192.4) | (4,720.3)
Total deferred tax assets | 881.7 | 88.6
Deferred tax liabilities | 26.8 | 19.4
Deferred Tax Assets, Net | $ 854.9 | $ 69.2

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