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Investments - Schedule of AFS Securities (Parenthetical) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
OTTI losses, investments, portion in other comprehensive income (loss) $ 0.1 $ 0.2