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Investments - Narrative (Details) - security | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Number of fixed maturity and equity securities | 159 | 749
Percentage of gross unrealized loss | 100.00% | 100.00%
Fixed maturity securities | Investment grade |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of gross unrealized loss | 81.70% | 87.90%
Percentage of fair value | 86.50% | 93.10%

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