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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
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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

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