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Catastrophe Reinsurance - Coverage for Catastrophe Reinsurance (Details) - Property and Casualty Insurance [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Retained [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Reinsured Risk, Percentage 0.00% 0.00% 0.00%
First Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Percentage 95.00% 95.00% 65.00%
Second Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Percentage 95.00% 95.00% 95.00%
Third Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Percentage   95.00% 90.00%
Fourth Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Percentage     50.00%
Minimum [Member] | Retained [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Amount Retained $ 0 $ 0 $ 0
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
Minimum [Member] | Second Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 150,000,000 100,000,000 100,000,000
Minimum [Member] | Third Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured   200,000,000 200,000,000
Minimum [Member] | Fourth Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured     350,000,000
Maximum [Member] | Retained [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Amount Retained 50,000,000 50,000,000 50,000,000
Maximum [Member] | First Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured 150,000,000 100,000,000 100,000,000
Maximum [Member] | Second Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured $ 350,000,000 200,000,000 200,000,000
Maximum [Member] | Third Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured   $ 400,000,000 350,000,000
Maximum [Member] | Fourth Layer of Coverage [Member]      
Liability for Catastrophe Claims [Line Items]      
Reinsurance Retention Policy, Excess Retention, Amount Reinsured     $ 450,000,000