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v3.22.4

Investments - Additional Information (Details) $ in Millions | 12 Months Ended
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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 |  |

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