Investment Securities - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-Sale [Line Items]
Gross unrealized losses on investment securities	$ 28.6	$ 34.5
Number of securities \| security	152	184
Proceeds from maturity of debt Securities	$ 5.4	$ 26.8
Gain on sale of investments	0.0	$ 0.6
Frandisco P&C
Debt Securities, Available-for-Sale [Line Items]
Debt securities, restricted	48.3
Frandisco Life
Debt Securities, Available-for-Sale [Line Items]
Debt securities, restricted	$ 27.7

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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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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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