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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Net operating loss carryforwards $ 2,272.2 $ 1,546.7
Interest limitation carryforwards 221.2 41.5
Foreign tax credits 171.2 142.9
Premiums on long-term debt 115.7 0.0
Employee benefits, including share-based compensation 81.6 73.9
Deferred revenue 1.3 0.1
Deferred Tax Assets, Capital Loss Carryforwards 0.0 998.0
Other 5.5 11.6
Total deferred tax assets 2,868.7 2,814.7
Valuation allowance (2,787.7) (2,588.7)
Net deferred tax assets 81.0 226.0
Property and equipment (40.9) (156.0)
Net discounts on long-term debt 0.0 (49.5)
Deferred U.S. tax on foreign income 0.0 (36.7)
Other (11.2) (23.7)
Total deferred tax liabilities 52.1 265.9
Deferred Tax Assets, Net $ 28.9  
Total deferred tax liabilities   $ 39.9