Investments - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	$ 28.8	$ 38.3
Available-for-sale Debt Securities	$ 6.4
Number of securities in unrealized loss position \| Security	33	23
Proceeds from sale of investment in fixed maturity securities	$ 7.3	$ 9.2
Proceeds from Sale of Other Investments	7.4	10.8
Payments to Acquire Investments	0.1	12.4	$ 14.2
Investments on deposit with the state insurance department	4.1
U.S. Treasury securities, obligations of U.S. Government agencies and municipalities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	21.0	30.0
Corporate Debt Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	7.8	$ 8.3
Bank Time Deposits
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Debt Securities	$ 5.6

Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.

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