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Catastrophe Reinsurance - Coverage for Catastrophe Reinsurance (Details) - Property and Casualty Insurance [Member] - USD ($) | 12 Months Ended
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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Stated amount that is the upper retention limit per entity policy. + References No definition available. + Details
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