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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%

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