Investments - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Investments Debt And Equity Securities [Abstract]
Gross unrealized gain (loss) on available for sale securities	$ 14,600,000
Proceeds from available-for-sale debt securities	23,600,000	$ 6,700,000
Gross realized gains or losses from sale of available-for-sale debt securities	0	0
Amount payable for securities purchased	0	750,000
Amount receivable for securities sold	0	$ 1,300,000
Gross unrealized gains	523,000,000,000		$ 0
Gross unrealized losses	467,000		638,000
Other than temporary impairments losses, investments	0
Investments	1,400,000		1,800,000
Deposits held in trust accounts	8,100,000		8,000,000.0
Deposits, held in trust for collateral requirements	$ 98,100,000		$ 95,700,000