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Investments - Summary of Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 31.2 | $ 31.0
Gross unrealized losses | (1.9) | (2.2)
Fair value | 29.3 | 28.8
U.S. Treasury securities, obligations of U.S. Government agencies and municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 26.1 | 22.8
Gross unrealized losses | (1.6) | (1.8)
Fair value | 24.5 | 21.0
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5.1 | 8.2
Gross unrealized losses | (0.3) | (0.4)
Fair value | $ 4.8 | $ 7.8

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