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Investments - Amortized Cost and Fair Value of Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 6.5 | $ 3.7
Due after one year through five years | 24.5 | 27.1
Amortized Cost, Total | 31.0 | 30.8
Fair value |  |
Due in one year or less | 6.4 | 3.7
Due after one year through five years | 22.4 | 25.4
Fair Value, Total | $ 28.8 | $ 29.1

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