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Investments - Schedule of Carrying Amounts and Fair Values of Available for Sale Securities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fixed maturity securities available for sale: |  |
Cost Basis | $ 18.7 | $ 18.8
Unrealized Gains | 0.8 | 0.9
Unrealized Losses | (2.0) | (1.9)
Corporate debt securities |  |
Fixed maturity securities available for sale: |  |
Cost Basis | 18.7 | 18.8
Unrealized Gains | 0.8 | 0.9
Unrealized Losses | (2.0) | (1.9)
Fair Value | 17.5 | 17.8
Carrying Value |  |
Fixed maturity securities available for sale: |  |
Fair Value | 17.5 | 17.8
Carrying Value | Corporate debt securities |  |
Fixed maturity securities available for sale: |  |
Fair Value | 17.5 | 17.8
Fair Value |  |
Fixed maturity securities available for sale: |  |
Fair Value | 17.5 | 17.8
Fair Value | Corporate debt securities |  |
Fixed maturity securities available for sale: |  |
Fair Value | $ 17.5 | $ 17.8

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