Investments - Schedule of Loans by Maturity (Details) $ in Millions	Mar. 31, 2023 USD ($) security loan	Dec. 31, 2022 USD ($) loan security
Investments, Debt and Equity Securities [Abstract]
One Year or Less	$ 10.0
Greater than One Year and Less than Three	44.8	$ 54.8
Greater than Three Years and Less than Five Years	33.8	33.8
Greater than Five Years and Less than Seven Years	20.4	20.4
Greater than Seven Years and Less than Ten Years	50.9	50.9
Cost	$ 159.9	$ 159.9
One Year or Less | security	2
Greater than One Year and Less than Three | security	8	10
Greater than Three Years and Less than Five Years | security	6	6
Greater than Five Years and Less than Seven Years | security	4	4
Greater than Seven Years and Less than Ten Years | security	8	8
Loan Count | loan	28	28