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Catastrophe Reinsurance - Coverage for Catastrophe Reinsurance (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Catastrophe [Member] | Minimum [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Amount Retained     $ 0  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured     60,000,000  
Property Catastrophe [Member] | Maximum [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Amount Retained     60,000,000  
Reinsurance Retention Policy, Excess Retention, Amount Reinsured     $ 110,000,000  
Property and Casualty Insurance [Member] | Retained [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Reinsured Risk, Percentage 0.00% 0.00% 0.00%  
Property and Casualty Insurance [Member] | First Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Percentage 95.00% 95.00% 95.00%  
Property and Casualty Insurance [Member] | Second Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Percentage 63.30% 31.70% 95.00% 31.70%
Property and Casualty Insurance [Member] | Third Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Percentage       63.30%
Property and Casualty Insurance [Member] | Minimum [Member] | Retained [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Amount Retained $ 0 $ 0 $ 0  
Property and Casualty Insurance [Member] | Minimum [Member] | First Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 50,000,000 50,000,000 50,000,000  
Property and Casualty Insurance [Member] | Minimum [Member] | Second Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 150,000,000 150,000,000 150,000,000 $ 150,000,000
Property and Casualty Insurance [Member] | Minimum [Member] | Third Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       150,000,000
Property and Casualty Insurance [Member] | Maximum [Member] | Retained [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Amount Retained 50,000,000 50,000,000 50,000,000  
Property and Casualty Insurance [Member] | Maximum [Member] | First Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 150,000,000 150,000,000 150,000,000  
Property and Casualty Insurance [Member] | Maximum [Member] | Second Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured $ 250,000,000 $ 250,000,000 $ 350,000,000 350,000,000
Property and Casualty Insurance [Member] | Maximum [Member] | Third Layer of Coverage [Member]        
Liability for Catastrophe Claims [Line Items]        
Reinsurance Retention Policy, Excess Retention, Amount Reinsured       $ 350,000,000