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Investments - Schedule of Unrealized Losses for Fixed Maturities Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Unrealized Losses    
Less than 20% $ (42.5) $ (116.0)
20% or more for less than six months (0.3) (0.8)
20% or more for six months or greater $ 0.0 $ (0.6)
Percentage of Total    
Less than 20% 99.30% 98.80%
20% or more for less than six months 0.70% 0.70%
20% or more for six months or greater 0.00% 0.50%
Unrealized Losses $ (42.8) $ (117.4)
Total 100.00% 100.00%