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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Statutory tax rate at UK Rate | 19.00% | 19.00% | 19.00%
Deferred tax valuation allowance | (47.70%) | (34.90%) | (17.30%)
Foreign tax rate differential | 7.10% | 6.60% | 6.40%
U.S. state and local tax expense, net of federal benefit | (0.30%) | 1.50% | 6.10%
Effect of changes in tax rate | 18.90% | 2.20% | (3.10%)
Write-off/impairment of investments | (1.80%) | 1.80% | (2.70%)
Reserve for uncertain tax positions | 0.00% | 0.80% | 2.50%
Research and development tax credits | 0.30% | 0.90% | 2.20%
UK CFC tax | 0.00% | 0.00% | 2.10%
U.S. tax on non-U.S. operations | 0.00% | 0.00% | (1.60%)
Base erosion anti-abuse tax | (0.031) | (0.007) | 0.015
Exempt income | 0.00% | 0.00% | 1.20%
Foreign tax withholding and credits | (0.20%) | (0.20%) | 0.00%
CARES Act rate differential | 0.00% | 2.80% | 0.00%
Disallowable professional fees | (1.50%) | 0.00% | 0.00%
Other, net | 0.30% | 0.50% | (0.20%)
Effective tax rate | (9.00%) | 0.30% | 16.10%

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