Investment Securities - Narrative (Details) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Gross unrealized losses on investment securities	$ 47.2	$ 0.9
Number of securities \| security	232	34
Proceeds from maturity of debt Securities	$ 20.9	$ 15.9
Gain on sale of investments	0.5	$ 0.3
Frandisco P&C
Debt Securities, Available-for-Sale [Line Items]
Debt securities, restricted	39.6
Frandisco Life
Debt Securities, Available-for-Sale [Line Items]
Debt securities, restricted	$ 24.1

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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