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Income Taxes (Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
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%