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Fair Value Measurements - Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) $ in Millions | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Fixed-maturity securities available for sale: |  |
Total | $ 17.5 | $ 17.8
Corporate debt securities |  |
Fixed-maturity securities available for sale: |  |
Corporate debt securities | 17.5 | 17.8
Level 1 |  |
Fixed-maturity securities available for sale: |  |
Total | 0.0 | 0.0
Level 1 | Corporate debt securities |  |
Fixed-maturity securities available for sale: |  |
Corporate debt securities | 0.0 | 0.0
Level 2 |  |
Fixed-maturity securities available for sale: |  |
Total | 0.0 | 0.0
Level 2 | Corporate debt securities |  |
Fixed-maturity securities available for sale: |  |
Corporate debt securities | 0.0 | 0.0
Level 3 |  |
Fixed-maturity securities available for sale: |  |
Total | $ 17.5 | 17.8
Level 3 | Discount Rate | Minimum |  |
Fixed-maturity securities available for sale: |  |
Discount rate | 0.163 |
Level 3 | Discount Rate | Maximum |  |
Fixed-maturity securities available for sale: |  |
Discount rate | 0.175 |
Level 3 | Discount Rate | Weighted Average |  |
Fixed-maturity securities available for sale: |  |
Discount rate | 0.175 |
Level 3 | Corporate debt securities |  |
Fixed-maturity securities available for sale: |  |
Corporate debt securities | $ 17.5 | $ 17.8

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