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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Net operating loss carryforwards $ 1,546.7 $ 148.4
Deferred Tax Assets, Capital Loss Carryforwards 998.0 0.0
Foreign tax credits 142.9 123.6
Interest limitation carryforwards 41.5 40.2
Premiums on long-term debt 0.0 23.8
Employee benefits, including share-based compensation 73.9 15.4
Deferred revenue 0.1 10.3
Other 11.6 14.5
Total deferred tax assets 2,814.7 376.2
Valuation allowance (2,588.7) (316.0)
Net deferred tax assets 226.0 60.2
Property and equipment (156.0) (54.5)
Net discounts on long-term debt (49.5) 0.0
Deferred U.S. tax on foreign income (36.7) (31.5)
Other (23.7) (9.0)
Total deferred tax liabilities 265.9 95.0
Total deferred tax liabilities $ (39.9) $ (34.8)