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Catastrophe Reinsurance - Coverage for Catastrophe Reinsurance (Details) - USD ($) | 12 Months Ended
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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

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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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