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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
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