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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.K. statutory income tax rate	19.00%	19.00%	19.20%
Non-U.K. taxes	(280.90%)	(18.00%)	(40.40%)
Bargain purchase gain	189.70%	(0.20%)	13.80%
Valuation allowance	(145.10%)	(16.90%)	(18.00%)
Debt repurchases	48.70%	(1.60%)	(2.80%)
Asset impairments	(31.00%)	(1.40%)	(17.10%)
U.S. tax reform	(21.60%)	2.20%	(8.40%)
Restructuring transaction	7.90%	1.70%	0.00%
Other	12.00%	(1.40%)	(2.00%)
Effective income tax rate	(201.30%)	(16.60%)	(55.70%)

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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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