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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.K. statutory income tax rate	19.20%	20.00%	20.20%
Non-U.K. taxes	(40.40%)	(7.90%)	(12.30%)
Valuation allowance	(18.00%)	2.60%	(1.50%)
Assets impairment	(17.10%)	0.00%	(4.00%)
Bargain purchase gain	13.80%	0.00%	0.00%
U.S. tax reform	(8.40%)	0.00%	0.00%
Debt repurchases	(2.80%)	(4.10%)	(0.00%)
Other	(2.00%)	0.30%	(1.50%)
Effective income tax rate	(55.70%)	10.90%	0.90%

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Effective Income Tax Rate Reconciliation, Bargain Purchase Gain, Percent

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Effective Income Tax Rate Reconciliation, Repurchase Of Debt, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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