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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

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Topic 820
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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