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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Amortized cost
Due in one year or less	$ 6.5	$ 7.3
Due after one year through five years	24.5	30.2
Due after five years through ten years	0.0	1.0
Amortized Cost, Total	31.0	38.5
Fair value
Due in one year or less	6.4	7.4
Due after one year through five years	22.4	30.0
Due after five years through ten years	0.0	0.9
Fair Value, Total	$ 28.8	$ 38.3

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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