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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Net operating loss carryforwards	$ 3,071.8	$ 3,308.9
Property and equipment	1,555.4	1,535.1
Interest limitation carryforwards	126.0	123.4
Employee benefits, including share-based compensation	36.6	41.6
Foreign tax credits	16.4	44.7
Premiums on long-term debt	4.0	6.0
Other	17.9	14.4
Valuation allowance	(3,971.3)	(4,192.4)
Total deferred tax assets	856.8	881.7
Deferred tax liabilities	26.7	26.8
Deferred Tax Assets, Net	$ 830.1	$ 854.9

X

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