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Income Taxes (Summary Of Significant Components Of Deferred Income Tax Assets (Liabilities)) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]    
Net operating loss carryfowards $ 197.9 $ 228.7
Foreign tax credits 91.7 84.1
Premium on long-term debt 57.4 86.0
Deferred Tax Assets, Deferred Income 55.7 77.7
Employee benefits, including share-based compensation 30.6 40.5
Other 32.5 20.5
Total deferred tax assets 465.8 537.5
Valuation allowance (238.8) (266.4)
Net deferred tax assets 227.0 271.1
Property and equipment (103.3) (97.1)
Intercompany transfers of property (18.9) (21.2)
Deferred costs (11.4) (15.3)
Other (23.6) (25.8)
Total deferred tax liabilities 157.2 159.4
Net deferred tax asset $ 69.8 $ 111.7