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Investments - Narrative (Details) - security
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Number of fixed maturity and equity securities 283 749
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 79.00% 87.90%
Percentage of fair value 87.90% 93.10%