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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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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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