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Taxation (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 22, 2019
Operating Loss Carryforwards [Line Items]        
Increase (decrease) in valuation allowance $ 13,000,000.0 $ 40,400,000 $ 5,300,000  
Income taxes paid 5,668,000 9,749,000 $ 341,000  
Unrecognized tax benefits 0 0    
Interest and penalties accrued on unrecognized tax benefits $ 0 $ 0    
Bermuda        
Operating Loss Carryforwards [Line Items]        
Statutory income tax rate 0.00%      
Singapore        
Operating Loss Carryforwards [Line Items]        
Foreign statutory income tax rate 17.00%      
Operating loss carryforwards $ 25,700,000      
Ireland        
Operating Loss Carryforwards [Line Items]        
Foreign statutory income tax rate 12.50%      
Operating loss carryforwards $ 5,600,000      
U.S.        
Operating Loss Carryforwards [Line Items]        
Expected tax rate 5.00%      
Foreign statutory income tax rate 21.00%      
Operating loss carryforwards $ 379,000,000.0      
Australia        
Operating Loss Carryforwards [Line Items]        
Foreign statutory income tax rate 30.00%      
Operating loss carryforwards $ 3,900,000      
Switzerland        
Operating Loss Carryforwards [Line Items]        
Foreign statutory income tax rate 21.20%      
Operating loss carryforwards $ 262,200,000      
U.K.        
Operating Loss Carryforwards [Line Items]        
Foreign statutory income tax rate 19.00%      
Operating loss carryforwards $ 122,200,000      
TMR        
Operating Loss Carryforwards [Line Items]        
Deferred tax assets, valuation allowance       $ 35,700,000