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Regulatory Requirements (Details)
£ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Regulatory Requirements [Abstract]        
Minimum capital requirement $ 250,000      
Percentage of minimum capital requirement 2.00%      
Net capital $ 4,300,000   $ 3,700,000  
Net capital exceeding regulatory requirements 4,100,000   3,400,000  
Own funds 876,000 £ 668 852,000 £ 671
Own funds requirement $ 254,000 £ 194 $ 195,000 £ 154