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Income Taxes - Operating loss carryfowards and tax credits (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]    
Foreign tax credit carryforward $ 16.0 $ 17.0
United Kingdom    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 198.0  
Foreign tax credit carryforward 10.0  
Ireland    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 24.0  
Australia    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 47.0  
Hong Kong    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 32.0  
Gibraltar    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 24.0  
Cyprus    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 1.0  
United States    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 78.0  
Foreign tax credit carryforward 6.0  
United States | Tax Years 2024 To 2027    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforward, annual utilization limit 2.0  
United States | Tax Years 2028 To 2038    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforward, annual utilization limit 1.0  
United States | Tax Years After 2038    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforward, annual utilization limit $ 0.3