Statutory Information and Dividend Restrictions -Reconciliations of Statutory Capital, Surplus and Net Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Consolidated net income, statutory basis	$ 179.9	$ 174.4	$ 24.7
Consolidated capital and surplus, statutory basis	$ 1,062.2	$ 1,013.3	$ 1,043.6