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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
U.K. statutory income tax rate | 19.00% | 19.20% | 20.00%
Non-U.K. taxes | (18.00%) | (40.40%) | (7.90%)
Valuation allowance | (16.90%) | (18.00%) | 2.60%
Debt repurchases | (1.60%) | (2.80%) | (4.10%)
Asset impairments | (1.40%) | (17.10%) | 0.00%
Bargain purchase gain | (0.20%) | 13.80% | 0.00%
U.S. tax reform | 2.20% | (8.40%) | 0.00%
Tax restructuring transaction | 1.70% | 0.00% | 0.00%
Other | (1.40%) | (2.00%) | 0.30%
Effective income tax rate | (16.60%) | (55.70%) | 10.90%

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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