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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.K. statutory income tax rate	19.00%	19.00%	19.00%
Non-U.K. taxes	(2.80%)	(280.90%)	(18.00%)
Bargain purchase gain	0.00%	189.70%	(0.20%)
Valuation allowance	(1.50%)	(145.10%)	(16.90%)
Debt repurchases	0.00%	48.70%	(1.60%)
Asset impairments	(12.50%)	(31.00%)	(1.40%)
U.S. tax reform and U.S. CARES Act	2.40%	(21.60%)	2.20%
Restructuring transactions	1.30%	7.90%	1.70%
Other	(0.80%)	12.00%	(1.40%)
Effective income tax rate	5.10%	(201.30%)	(16.60%)

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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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to impairment loss.

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