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Income Taxes - Additional Information (Details) - USD ($)
 3 Months Ended 8 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2021
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2020
Income Taxes [Line Items]                
United States corporate tax at a rate         34.00%      
Foreign exchange         $ (2,100,000) $ 200,000 $ (400,000)  
Prior year adjustments         1,300,000 3,300,000 (4,500,000)  
Income tax examination, interest accrued         400,000 1,300,000    
Income tax examination, cumulative interest accrued         1,700,000 1,300,000    
Impact of unrecognized tax benefits         100,000 (1,900,000) 0  
Effective Income Rate Tax Reconciliation, Tax Settlement, Foreign Credit, Amount         300,000 3,200,000    
Unrecognized tax benefits         11,200,000 10,500,000 $ 29,200,000  
Foreign exchange re-translation         1,000,000 3,400,000    
Settlement in respect of tax position of prior years         (300,000) (15,300,000)    
Accrued interest and penalties         0 0    
Less valuation allowance         (104,800,000) (142,500,000)    
Increase (decrease) in valuation allowance         38,400,000 (20,700,000)    
Foreign tax credit carryforwards         4,000,000 2,500,000    
US branch profits, subject to tax         0 1,900,000    
Other Comprehensive Income                
Income Taxes [Line Items]                
Less valuation allowance         0 (300,000)    
Internal Revenue Service (IRS)                
Income Taxes [Line Items]                
Net operating loss carryforwards         482,700,000 343,200,000    
Capital loss carryforwards         500,000 500,000    
Charitable contribution carryforwards         700,000 500,000    
Less valuation allowance         $ (101,100,000) (139,200,000)    
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         2036      
U.K.                
Income Taxes [Line Items]                
U. K. corporate tax rate reduced during the period 20.00%              
Net operating loss carryforwards         $ 84,900,000 18,200,000    
Capital loss carryforwards         3,800,000      
Less valuation allowance         (3,700,000) (3,300,000)    
Increase (decrease) in valuation allowance         (400,000) (2,600,000)    
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         $ 38,400,000 (21,000,000)    
Valuation Allowance, Operating Loss Carryforwards | U.K.                
Income Taxes [Line Items]                
Less valuation allowance         $ (400,000) $ (2,700,000)    
Subsequent Event                
Income Taxes [Line Items]                
United States corporate tax at a rate     21.00%          
Foreign tax credit carryforwards               $ 1,200,000
Subsequent Event | U.K.                
Income Taxes [Line Items]                
U. K. corporate tax rate reduced during the period       19.00%