Investments - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investments, Debt and Equity Securities [Abstract]
Gross unrealized losses	$ 6.3	$ 23.3
Number of debt securities held, unrealized loss position | security	175
Gross unrealized losses, twelve months or more (less than)	$ 4.9	21.0
Financing receivable, allowance for credit loss	0.0	0.0
Realized investment gains	0.6	$ 0.4	$ 0.0
Restricted investments	$ 82.2