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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended 8 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2021
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Income Taxes [Line Items]          
United States corporate tax at a rate     21.00% 34.00%  
Prior year reductions     $ 0 $ (11,000,000)  
Accrued penalties     0 0  
Accrued interest $ 1,800,000        
Less valuation allowance     149,200,000 111,900,000  
Increase (decrease) in valuation allowance     9,200,000 7,100,000  
US branch profits, subject to tax     0 0  
Other Comprehensive Income          
Income Taxes [Line Items]          
Less valuation allowance     0 0  
Internal Revenue Service (IRS)          
Income Taxes [Line Items]          
Net operating loss carryforwards     606,800,000 599,400,000  
Operating loss carryforwards, subject to s382 limitation     24,900,000    
Operating loss carryforwards, remaining     581,900,000    
Operating loss carryforwards, subject to expiration date     534,500,000    
Operating loss carryforwards, not subject to expiration     47,400,000    
Capital loss carryforwards     500,000 300,000  
Charitable contribution carryforwards     1,100,000 800,000  
Less valuation allowance     $ 117,400,000 108,200,000  
Internal Revenue Service (IRS) | Minimum          
Income Taxes [Line Items]          
Operating loss carryforwards, date of expiration     2026    
Internal Revenue Service (IRS) | Maximum          
Income Taxes [Line Items]          
Operating loss carryforwards, date of expiration     2039    
U.K.          
Income Taxes [Line Items]          
U. K. corporate tax rate reduced during the period 20.00%       19.00%
Net operating loss carryforwards     $ 93,200,000 59,300,000  
Capital loss carryforwards     3,800,000    
Less valuation allowance     31,800,000 3,700,000  
Increase (decrease) in valuation allowance     28,200,000 0  
U.K. | Other Comprehensive Income          
Income Taxes [Line Items]          
Less valuation allowance     $ 0 0  
Bermuda          
Income Taxes [Line Items]          
Bermuda tax rate     0.00%    
Forecast | U.K.          
Income Taxes [Line Items]          
U. K. corporate tax rate reduced during the period   17.00%      
Valuation Allowance, Operating Loss Carryforwards          
Income Taxes [Line Items]          
Increase (decrease) in valuation allowance     $ 9,200,000 7,100,000  
Valuation Allowance, Operating Loss Carryforwards | U.K.          
Income Taxes [Line Items]          
Less valuation allowance     $ 28,200,000 $ 0