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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent
Federal statutory income tax rate	21.00%	21.00%	21.00%
State income taxes	14.60%	2.50%	2.90%
Federal benefit of state taxes	(3.10%)	(0.50%)	(0.60%)
Foreign rate differential	(10.10%)	(1.70%)	0.00%
U.K. tax rate adjustment	38.20%	0.00%	0.00%
Tax benefit from stock-based compensation	(18.10%)	(8.10%)	(5.20%)
Acquisition-related items	(15.90%)	1.80%	0.00%
Book basis in excess of tax basis for goodwill impairment and disposition	9.20%	0.00%	3.00%
Non-deductible executive compensation	9.00%	10.60%	0.40%
CVR liability fair value and foreign currency adjustment	8.20%	0.70%	0.00%
Foreign-derived intangible income deduction	(7.20%)	(3.30%)	(1.80%)
Return to provision adjustments	(4.90%)	(0.40%)	(0.30%)
Research and development credit	(4.10%)	(2.40%)	(0.90%)
State tax rate adjustment	(2.80%)	5.10%	0.00%
Cares Act net operating loss adjustment	(2.30%)	0.00%	0.00%
Withholding tax on distribution	2.10%	0.00%	(0.40%)
Deferred tax and other rate adjustments	1.10%	0.20%	0.00%
Unrecognized tax benefits	0.30%	(1.40%)	(0.30%)
Global intangible low-tax income	0	0	0.011
Other	0.80%	0.10%	(0.10%)
Effective income tax rate	36.00%	24.20%	18.80%

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