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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Net operating loss carryfowards $ 187.1 $ 197.9
Foreign tax credits 132.3 91.7
Premium on long-term debt 36.1 72.7
Deferred Tax Assets, Deferred Income 26.0 55.7
Employee benefits, including share-based compensation 20.7 30.6
Other 12.8 17.2
Total deferred tax assets 415.0 465.8
Valuation allowance (278.8) (238.8)
Net deferred tax assets 136.2 227.0
Property and equipment (51.5) (103.3)
Deferred U.S. tax on foreign income (24.8) (15.2)
Deferred transition tax (13.7) 0.0
Deferred costs (9.1) (11.4)
Intercompany transfers of property 0.0 (18.9)
Other (8.7) (8.4)
Total deferred tax liabilities (107.8) (157.2)
Net deferred tax asset $ 28.4 $ 69.8