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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Net operating loss carryforwards	$ 3,103.9	$ 3,071.8
Property and equipment	1,397.4	1,555.4
Interest limitation carryforwards	112.9	126.0
Employee benefits, including share-based compensation	28.0	36.6
Foreign tax credits	0.2	16.4
Other	17.9	21.9
Valuation allowance	(3,292.3)	(3,971.3)
Total deferred tax assets	1,368.0	856.8
Deferred tax liabilities	26.9	26.7
Deferred Tax Assets, Net	1,341.1	$ 830.1
Net operating loss carryforwards	$ 13,600.0

X

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Amount of deferred tax liability attributable to taxable temporary differences.

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