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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Net operating loss carryforwards | $ 3,028.7 | $ 2,297.5
Deferred Tax Assets, Property, Plant and Equipment | 1,454.8 | 1,361.6
Interest limitation carryforwards | 193.4 | 74.8
Foreign tax credits | 60.7 | 105.7
Premiums on long-term debt | 8.1 | 9.7
Employee benefits, including share-based compensation | 43.1 | 51.2
Other | 20.1 | 15.4
Total deferred tax assets | 4,808.9 | 3,915.9
Valuation allowance | (4,720.3) | (3,829.0)
Net deferred tax assets | 88.6 | 86.9
Property and equipment | 0.0 | 0.0
Other | (19.4) | (14.5)
Total deferred tax liabilities | 19.4 | 14.5
Deferred Tax Assets, Net | $ 69.2 | $ 72.4

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