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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
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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)

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