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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Net operating loss carryforwards | $ 2,293.5 | $ 2,272.2
Deferred Tax Assets, Property, Plant and Equipment | 1,361.6 | 0.0
Interest limitation carryforwards | 74.8 | 221.2
Foreign tax credits | 105.7 | 171.2
Premiums on long-term debt | 9.7 | 115.7
Employee benefits, including share-based compensation | 51.2 | 81.6
Other | 15.4 | 6.8
Total deferred tax assets | 3,911.9 | 2,868.7
Valuation allowance | (3,829.0) | (2,787.7)
Net deferred tax assets | 82.9 | 81.0
Property and equipment | 0.0 | (40.9)
Other | (14.5) | (11.2)
Total deferred tax liabilities | 14.5 | 52.1
Deferred Tax Assets, Net | $ 68.4 | $ 28.9

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