Investments - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Net Investment Income [Line Items]
Gross unrealized losses	$ 0.0	$ 1.3
Number of debt securities held, unrealized loss position | security	54
Gross unrealized losses, twelve months or more	$ 0.0
Financing receivable, allowance for credit loss	0.0	0.0
Realized investment gains (losses)	0.4	0.1	$ (0.6)
Restricted investments	81.5	81.3
Fixed Income Securities
Net Investment Income [Line Items]
Gross unrealized losses	0.1	1.3
Gross unrealized losses, twelve months or more	$ 0.1	$ 0.5