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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
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